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Car Forum / Jeep / March 2006

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87 wrangler starting problem - HELP!

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bennettvonbennett@gmail.com - 24 Mar 2006 00:46 GMT
can one of you Jeep gurus help me out? i have been given a 1987 Jeep
Wrangler (4.2L 6cyl) and have been having trouble getting it to start
reliably.
when the vehicle is completely cold it starts right up no problem, it
will idle at approx 1000rpm and - while its still parked - can be
revved up with plenty of power. however, if i shut it off and then try
to restart it - no dice. motor turns over and spark is present but the
engine will not catch, no matter whether the accel pedal is left alone
or held down. this is true even when the motor has initially run for
even just a minute or so.
also when it is driven the idle cannot be allowed to dip below approx
1100 rpm or it will stall and not start again for some time (at least
30 minutes or so but i havent figured out exactly how much time is
required yet...).  i have very little history on the vehicle, and aside
from the fact that its had this same problem now for about a year, i
dont know if this problem appeared suddenly or developed over time...
i have replaced the rotor, cap, plugs, plug-wires, and in-line fuel
filter. the air filter while not new appears servicable. i also added
some stabilizer to the fuel and put a few gallons of new premium in the
tank...
could the problem be in any way related to the brake booster? there are
signs of previous brake fluid leakage around the flange where the
master cyl bolts on (bubbled paint etc) but i dont see any actual
leakage now... perhaps this is why can idle and rev while parked but
cannot idle when driven?
but then why no restart when its just been sitting at the curb and the
engine is just a tiny bit 'warm'?
perhaps a more likely culprit is the choke circut? or the carburator
generally? the accelerator pump at least is working - strong jet of
fuel w/accel pedal pressed.
i dont know how to check the various different parts of the fuel
delivery system individually so i dont have any idea even where to
start - if i was to purchase a rebuilt BBD carb would this come with
all the various solenoids, stepper motors, choke assembly, diaphragms,
throttle switch. etc etc? probably not i would think... does this
matter?
whaddya think? i'm no mechanic but i'm not totally ignorant of
carburated engines either. can you point me in the right direction so i
can get my 'new' black beast running?

eagerly awaiting your diagnostic wisdom,
thanks in advance.
Bennett
L.W.(ßill) Hughes III - 24 Mar 2006 04:27 GMT
Hi Bennett,
    You need a choke pull-off, number forty at:
http://www.carburetorfactory.com/expvw03.html And you probably need a
kit for your carburetor, too. It's not that hard, easiest for me to take
it apart on a card table, with a towel spread out on it to catch the
small ball bearing valves as the spring from the body.
       God Bless America, Bill O|||||||O
mailto:LWHughes3rd@aol.com http://www.billhughes.com/

> can one of you Jeep gurus help me out? i have been given a 1987 Jeep
> Wrangler (4.2L 6cyl) and have been having trouble getting it to start
[quoted text clipped - 39 lines]
> thanks in advance.
> Bennett
bobvonbob - 24 Mar 2006 04:54 GMT
thanks bill - i'll try the choke pull-off!

i have a slight problem with a lack of avail. workspace - nowhere to
soak parts, no compressor to blow out ports, etc - also this sucker is
soon to be my only vehicle so time is of the essence - all that said:
d'ya think its better to attempt to rebuild the carb myself or to by a
rebuilt one from NAPA or wherever..
.
also any good links for getting rid of this Carter and switching to a
Weber? i've seen this mentioned and am curious....

thanks and i'll post and mention whether the choke pull-off replacement
has any effect...
bennett
L.W.(ßill) Hughes III - 24 Mar 2006 05:18 GMT
    That's what the dinning room table is for. For one carburetor in
this injection time period, it's not worth buy the parts dip, just a can
of Berryman's B-12 carburetor cleaner is sufficient:
http://www.berrymanproducts.com/Default.aspx?tabid=125 Each kit comes
with an explode view, measurements and gauges:
http://www.billhughes.com/holley.jpg
       God Bless America, Bill O|||||||O
mailto:LWHughes3rd@aol.com

> thanks bill - i'll try the choke pull-off!
>
[quoted text clipped - 10 lines]
> has any effect...
> bennett
Steve Foley - 24 Mar 2006 13:45 GMT
Before you start tearing down the carb, check the idle tubes. I'm sure Bill
can provide a link. I went through SEVEN carbs on my 87 YJ before I gave up
on the 'professionals' and crawled back under the hood.

> thanks bill - i'll try the choke pull-off!
>
[quoted text clipped - 10 lines]
> has any effect...
> bennett
Mike Romain - 24 Mar 2006 15:48 GMT
It has a carb.  On the second fast start, you will need to pump the gas
like mad to get it going because the POS (piece of sh..) timer choke has
opened.  Once you wait a bit, the choke closes and it starts back up...
The choke opens by how long it has seen 12 volts.  It doesn't care how
warm or cold the engine 'really' is.

I have never seen the choke pull off Bill mentioned go bad on a Jeep
carb.... When they do fail you get a 'stable' high idle that can't be
turned down but it won't cause stalling.

I highly recommend a manual choke kit for them.  It makes it sooo nice
when trying to drive it before it is fully warmed up...  Most auto parts
stores sell the kits.  The heavy duty kit comes with the correct choke
replacement parts and is a bolt on unit.

A Carb kit for them is about $20.00 and is easy to do.  I recommend you
don't take any parts apart that need adjusting unless you have to to
clean them.

One thing that can aggravate this is having the gas filter in upside
down or having the wrong gas filter in it.  The filter has 2 outlets.
The center outlet goes to the carb and the top outlet goes to the return
line.  If the return line outlet isn't at the top, then gas can syphon
back to the gas tank or in a shutdown case, get pushed back so it vapor
locks or air locks the gas line.  If this happens, you can prime the
carb with a quarter cup of gas down it's throat and the engine will go
vroom.  You might have to do it twice to get the pump to pick up the
fuel again.  It takes a 'lot' of cranking to overcome this vapor lock
otherwise, a battery killing 'lot'....

Now to address the idle.  First off you will need to see if the carb
float bowl and gas tank vent is working.  If it is shot, you will have
to replace it or disconnect it and drive with lots of gas fumes around
while waiting for a new one...

To test it have the engine at idle and trace the PCV line to the back of
the carb.  There you will find a solenoid thing that can actually be
replaced with a T fitting if it isn't functioning and they do fail.
(when they fail massive amounts of oil will blow into the air filter)

Off this solenoid or T fitting one line will go way down below the brake
booster to a charcoal canister sitting at the bottom of the fender.  At
idle pinch this line to the canister closed.  If the idle changes, the
canister purge valve has failed and the canister must be replaced.  For
temporary set up purposes, you can unplug this line from the canister
and block it with a tight fitting bolt so the PCV system is now sealed
back up.

If this canister is working ok, then I would suspect the carb has the
common problem of plugged up idle circuit tubes.  These brass tubes have
crimped ends that are too small so they plug up easy.  It is recommended
to physically ream these ends out because the chemical cleans just won't
get them clean.  That is why a lot of 'professionally' rebuilt carbs
still have blocked up tubes.  It is a 'no no' for a rebuilder to
physically ream parts so they rely on chemicals and put out crappy
rebuilt carbs.

Here is a good site on the idle tube issue:
http://www.off-road.com/jeep/tech/engine/carter.html

The tool used can be found at welding supply stores.  The small drills
or files are used for cleaning torch tips.  I can actually pull out the
venturi from the top once I remove the choke plate.  It will lift up and
spin around and pull out past the choke plate pivot bar.  Best to do the
first time as part of a carb kit and clean up.

When doing the carb clean, pay close attention to the chunk of gas line
from the filter to the carb.  The U shaped line will hold all kinds of
crud that builds up as the vehicle sits and the gas evaporates away.  It
is often a source for a second bout of plugged up idle tubes that seems
to happen just after a carb clean....

If you suspect the brake booster is bad, just unplug it at the booster
and block the line to see if the idle gets right.

Hope some of this helps....

Feel free to ask if any of it isn't clear.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos:  Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)

> can one of you Jeep gurus help me out? i have been given a 1987 Jeep
> Wrangler (4.2L 6cyl) and have been having trouble getting it to start
[quoted text clipped - 39 lines]
> thanks in advance.
> Bennett
bobvonbob - 26 Mar 2006 17:17 GMT
thanks Mike - i will attend to the idle tubes today or tomorrow and let
you know what happens - i appreciate all the free advice - i'd like to
start drivin this thing thru the, soon to be, springtime mud!
cheers,
bennett
bobvonbob - 28 Mar 2006 17:13 GMT
well after a brief moment of triumph it appears that my joy was
premature... i removed the venturi cluster and cleaned out the idle
tubes, they were in fact dripping at idle and there was quite alot of
crud in them and in the 2 screws. i also cleaned out the gas feed line
from the fuel filter to the carb just for good measure. since it was
nightime by then and i didnt have my jumper cables handy i let it sit
till the next day, when happily, it started up - not such a surprise as
it reliably starts when cold - but then continued to start up all day
long - the idle was high (about 1000rpm sometimes sticking up at around
1500 and blipping the throttle only worked to bring it down about 1/2
the time) and when starting it seemed a bit reluctant for about 1/2 a
second but then it would fire right up and run great. no stalls no
rough running no hiccups etc.
then last night i had a date (uhhh oh...) and of course - no start. she
(the jeep that is) had sat for about 3-4 hours at this point so i was
surprised (she's supposed to start up and THEN leave me stranded with
my date looking on - jealousy is so ugly) anyway i cranked it
periodically until the batt ran down then hooked up jumper cables but
all to no avail... it didnt even sound like there was any spark at
all... i dont think the motor ever even fired once, although it seemed
to diesel for about 1/4 second once or twice after about 20 seconds of
continuous cranking (didnt want to kill the starter motor).
i had a couple of tablespoons of gas left in a gas can, so i tried
pouring that into the barrel of the carb - no difference. tried
cracking the gas cap and pulling the vent line to the carb float bowl -
nope. since it was nightime and i was in clean clothes and had even
scraped all the oil out from under my fingernails in anticipation of
some serious making out and since - oddly enough - i didnt have a spare
spark plug in my pocket, i wasnt able to see if there was in fact any
spark at all. today i'm gonna have to wait until i can get someone over
to jump me to find out...
in the meantime, anyone have any bright ideas about this? i'm beginning
to lean toward a problem on the ignition side of things but honestly i
have no idea. today i plan to test the coil, and pull the Ignition
Control Module and bring it in to NAPA - they say they can test it...
i've been trolling some previous posts and there was a very similiar
case to mine (averyislandboy, Bob V, from back in Oct 2003 - sorry i
dont know how to hotlink here) - his symptoms were similiar if not
identical and he apparently resolved them by purchasing a new - what he
calls - ECM, by which i take to mean ICM - Ignition Control Module;
that is opposed to the ECU - the Electronic Control Unit. i assume he's
referring to the ICM based on the implied location of said module, in
the engine compartment... (vs ECU in the passenger compartment) and
from the details of his post. can anyone clarify  this? Bob, you out
there?
seems to me that if the master brain box - the ECU - was bad the Jeep
wouldnt run at all as opposed to intermittently...
well i suppose i can take the ICM out and have it tested anyway... i
will let all of you know what happens.
i am interested to know, Bob if you're still out there - did the
problem ever reappear or did the new ICM (ECU?) fix it completely?

thanks for all the help,
bennett

PS i am seriously considering pulling the choke circuit as well and
replacing it with a manual choke... and when i have the money trashing
the Carter and going to a Weber set up. how bout a replacement for the
ignition circuit? what's the inside scoop with that?

PPS does the 87 YJ 4.2L have a Crank Position Sensor?

sorry for the barrage of questions... thanks for all your patience.
b
Mike Romain - 28 Mar 2006 17:55 GMT
Ouch.

Ok, you seem to have more than one thing going on.  First off only
kicking the idle down about half the time is a linkage thing.  Likely
the choke linkage pieces and the fast idle cam need some oil.  I
actually use WD40 on them because it cleans the crud out without leaving
too much behind.  If I have, I will use carb cleaner on those parts
too.  That also might indicate a dirty connection on the electric choke
not allowing it to open fully.

They even get dirty enough that the choke seizes up.  When you checked
it to pour in the gas, was the choke closed?  It should have been.  If
not, the linkage needs serious cleaning.  They like to seize up right
where the choke electric module's shaft comes out.

A bad ignition module can be some of your trouble for sure.  When
getting one stay far far away from the Wells unit.  They come dead in
the box more often than they come good.  Seriously, they have screwed up
something serious in them.  If you can find a motorcraft one it would be
the best.

At least you have no CPS to worry about...

The coil pickup in the distributor also can go bad.  You can check it
with a multimeter.  It should read between 400 to 800 ohms.  Mine was a
failed unit at about 415 ohms...

I would be checking the inside of the distributor cap also for crud or
carbon tracks.  That can affect starting.  There also is a bad batch of
them on the market.  The rotors are too short so they arc out all over
the place.

Did you get the carb screws back the same as they were?

One last gotcha is the body ground.  There is a wire mesh strap from the
rear of the engine head up to the firewall.  When it goes ratty the
vehicle steals grounds and will do very strange things like not wanting
to start.  The ignition module needs a ground to run.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos:  Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)

> well after a brief moment of triumph it appears that my joy was
> premature... i removed the venturi cluster and cleaned out the idle
[quoted text clipped - 60 lines]
> sorry for the barrage of questions... thanks for all your patience.
> b
bobvonbob - 29 Mar 2006 00:49 GMT
thanks mike - here's an update, first things first: i checked for spark
and sure enough, spark is present. cant speak for the strength but she
has fire.
so next i went and got a new choke pull off and ICM - not too
expensive, about $40 from NAPA - when i went to replace the pull off i
noticed that the vacuum hose to the pull off from the carb was
seriously cracked - i dont mean heat cracks - i mean two big splits,
one on either end of the hose where LOTS of air would have been coming
thru... AAHA! i thought! the culprit!
but no - no start. replaced the ICM - still no start.
then i double checked the part # for the pull off with the part # of
the carb and lo and behold - it is the incorrect pull off! my Carter
BBD is apparently a model 8383 and this pull off is only for models
8338 and 8339... i have since found the correct pull off and will be
replacing it tonight or tomorrow so we'll see...
an interesting note - when my friend and i were trying to get it to
start after replacing both parts, the motor was turning over but still
not catching - just like before. on a whim i reached over and manually
opened the choke plate - and vroom! she started! she ran great, idled
happily at about 700rpm and revved with a healthy roar. i noticed that
while she was running, the choke plate stayed at least partially open -
held open by the (apparently incorrect) choke pull off which appeared
to have vacuum since it was engaged. we turned it off and she restarted
again no problem. now after an hour or so - no start, choke plate
completely closed - my friend split so i have no one to crank it while
i hold the plate open (and no remote starter) so i dont know if i can
successfully reproduce the starting procedure...
i suppose this is a VERY long way of asking how exactly the choke pull
off is supposed to work and whether this could be the ultimate source
of the problem (the linkage WAS a bit sticky, cleaned and lubed it up -
thanks). sorry this comes out rather stream-of-consciousness, i think
better while talking or typing - thinking out loud so to speak... if i
had a slightly better idea of how the choke circuit is supposed to work
this might be clearer to me...

thanks for all your help,
bennett
Mike Romain - 29 Mar 2006 01:02 GMT
The hard start was likely the broken vacuum line to the choke pull off.
Bill's guess was right.  As soon as it sees vacuum it is supposed to
open the choke so the engine doesn't flood out.  This is critical on hot
starts because of that stupid timer choke.  If it has time to cool off,
then the choke is all the way shut and flood happens.  Your old one is
very likely just fine.  It was only a busted hose.

Once these engines flood, they are pigs to get going.

Once the engine is going, the choke opens so the pull off isn't in the
circuit anymore.  Unless it is interfering with the choke opening all
the way because it is the wrong part....

You can stick a long screwdriver down the carb to hold the choke plate
open a bit for starts.

Mike

> thanks mike - here's an update, first things first: i checked for spark
> and sure enough, spark is present. cant speak for the strength but she
[quoted text clipped - 33 lines]
> thanks for all your help,
> bennett
bobvonbob - 29 Mar 2006 19:59 GMT
ok. i replaced the pull off with the correct model - they seemed
completely identical to me but what do i know? - now when she is cold i
notice that the choke plate (butterfly) is partially open and she will
start up 90% of the time. HOWEVER - if she doesnt catch, i cannot get
her start as per earlier and upon inspection the choke plate is ALWAYS
CLOSED. if i then use something to physically hold the choke plate open
- no problem, she will start with a little rough idle for 1-3 seconds
probably due to the flooding...
so, having replaced the choke pull off, and the vacuum line to the pull
off, should i consider replacing the choke thermostat sensor or
whatever its called? it would make a nice paperweight i suppose, and i
could put a manual choke in... would i have to drill a hole in my dash
for that? could this POS be the source of the problem? it sure seems
like it since the pull-off doesnt seem to be the one actuating the
opening and closing of the plate when i am experiencing this problem...
at least she appears to be drivable and will start 'reliably' as long
as i have my little piece of wood handy(to prop open the plate). i feel
kinda stupid tho and would like to nail this problem so i can move on
to all the other issues... exhaust, valve cover leak, wheel alignment,
etc etc etc - she's a greedy jealous little bitc... err thing - just
like all my girlfriends, no wonder i'm already in love.
bennett

PS thanks esp to Mike and Roy for all their time and patience - and
kudos to you Bob, got it (at least partially) right on the first
guess...
billy ray - 29 Mar 2006 21:42 GMT
Bob,

It sounds like you need to make a slight adjustment to the linkage or
replace it with a manual choke.

Manual chokes usually come with a bracket or can be placed in your dash for
a 'cleaner' install.

> ok. i replaced the pull off with the correct model - they seemed
> completely identical to me but what do i know? - now when she is cold i
[quoted text clipped - 22 lines]
> kudos to you Bob, got it (at least partially) right on the first
> guess...
DougW - 30 Mar 2006 01:04 GMT
billy ray did pass the time by typing:
> Bob,
>
[quoted text clipped - 3 lines]
> Manual chokes usually come with a bracket or can be placed in your dash for
> a 'cleaner' install.

There should be a little adjustment screw that sets how closed the plate
can get. If it's not adjusted to give a bit of clearance the butterfly can
stick shut and no spring can pull that open.  Also check how smooth the bushings
are, if they are gummed up it can stick also.

(I'm working off foggy knowlege of the Rochester 4M4 quadrasuck..er quadrajet)

>> ok. i replaced the pull off with the correct model - they seemed
>> completely identical to me but what do i know? - now when she is cold i
[quoted text clipped - 4 lines]
>> - no problem, she will start with a little rough idle for 1-3 seconds
>> probably due to the flooding...
billy ray - 30 Mar 2006 01:27 GMT
Yes,  I've vague recollection of using feeler gauges to check the gap but I
haven't a clue to what the measurement would be.

I'd be willing to bet that Bill knows....

> billy ray did pass the time by typing:
>> Bob,
[quoted text clipped - 23 lines]
>>> - no problem, she will start with a little rough idle for 1-3 seconds
>>> probably due to the flooding...
Mike Romain - 30 Mar 2006 02:37 GMT
On the BBD all that is done by bending the V section of the linkages.

Hopefully the OP has all the BBD settings and how to set them....  The
Haynes CJ manual is the best for his engine and underhood wiring.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos:  Non members can still view!
Jan/06 http://www.imagestation.com/album/pictures.html?id=2115147590
(More Off Road album links at bottom of the view page)

> Yes,  I've vague recollection of using feeler gauges to check the gap but I
> haven't a clue to what the measurement would be.
[quoted text clipped - 28 lines]
> >>> - no problem, she will start with a little rough idle for 1-3 seconds
> >>> probably due to the flooding...
Mike Romain - 30 Mar 2006 01:25 GMT
The choke should be almost all the way closed when the Jeep is off.
Once you start it, vacuum hits the choke pull off and opens the choke
about 1/4" so it gets some air to run rich for cold starting.

Then as the engine warms up or as long as the choke has power to it, the
choke will open all the way in less than 5 minutes.  It will stay open.

If it is not opening, then the electrical connection on the choke is
suspect for a dirty connection.  There should be 12 volts there as long
as you have oil pressure.  If you do not have 12 volts there, then go to
the oil pressure sender near the back passenger side of the block and
see if the plug is plugged in.  The oil pressure sender has a switch
that allows power to pass when running.  The power goes to the choke and
a relay dead center of the firewall in the harness that supplies power
to the manifold heater under the carb.

If you do have 12 volts at the choke and it still isn't working, it can
be seized up where the shaft comes out of the electric coil unit.  That
is common or the sucker is dead.

Manual kits come with a bracket you can hang below the dash edge.

Good luck,

Mike

> ok. i replaced the pull off with the correct model - they seemed
> completely identical to me but what do i know? - now when she is cold i
[quoted text clipped - 22 lines]
> kudos to you Bob, got it (at least partially) right on the first
> guess...
bobvonbob - 29 Mar 2006 19:59 GMT
ok. i replaced the pull off with the correct model - they seemed
completely identical to me but what do i know? - now when she is cold i
notice that the choke plate (butterfly) is partially open and she will
start up 90% of the time. HOWEVER - if she doesnt catch, i cannot get
her start as per earlier and upon inspection the choke plate is ALWAYS
CLOSED. if i then use something to physically hold the choke plate open
- no problem, she will start with a little rough idle for 1-3 seconds
probably due to the flooding...
so, having replaced the choke pull off, and the vacuum line to the pull
off, should i consider replacing the choke thermostat sensor or
whatever its called? it would make a nice paperweight i suppose, and i
could put a manual choke in... would i have to drill a hole in my dash
for that? could this POS be the source of the problem? it sure seems
like it since the pull-off doesnt seem to be the one actuating the
opening and closing of the plate when i am experiencing this problem...
at least she appears to be drivable and will start 'reliably' as long
as i have my little piece of wood handy(to prop open the plate). i feel
kinda stupid tho and would like to nail this problem so i can move on
to all the other issues... exhaust, valve cover leak, wheel alignment,
etc etc etc - she's a greedy jealous little bitc... err thing - just
like all my girlfriends, no wonder i'm already in love.
bennett

PS thanks esp to Mike and Roy for all their time and patience - and
kudos to you Bob, got it (at least partially) right on the first
guess...
bobvonbob - 29 Mar 2006 19:59 GMT
ok. i replaced the pull off with the correct model - they seemed
completely identical to me but what do i know? - now when she is cold i
notice that the choke plate (butterfly) is partially open and she will
start up 90% of the time. HOWEVER - if she doesnt catch, i cannot get
her start as per earlier and upon inspection the choke plate is ALWAYS
CLOSED. if i then use something to physically hold the choke plate open
- no problem, she will start with a little rough idle for 1-3 seconds
probably due to the flooding...
so, having replaced the choke pull off, and the vacuum line to the pull
off, should i consider replacing the choke thermostat sensor or
whatever its called? it would make a nice paperweight i suppose, and i
could put a manual choke in... would i have to drill a hole in my dash
for that? could this POS be the source of the problem? it sure seems
like it since the pull-off doesnt seem to be the one actuating the
opening and closing of the plate when i am experiencing this problem...
at least she appears to be drivable and will start 'reliably' as long
as i have my little piece of wood handy(to prop open the plate). i feel
kinda stupid tho and would like to nail this problem so i can move on
to all the other issues... exhaust, valve cover leak, wheel alignment,
etc etc etc - she's a greedy jealous little bitc... err thing - just
like all my girlfriends, no wonder i'm already in love.
bennett

PS thanks esp to Mike and Roy for all their time and patience - and
kudos to you Bob, got it (at least partially) right on the first
guess...
bobvonbob - 29 Mar 2006 20:00 GMT
ok. i replaced the pull off with the correct model - they seemed
completely identical to me but what do i know? - now when she is cold i
notice that the choke plate (butterfly) is partially open and she will
start up 90% of the time. HOWEVER - if she doesnt catch, i cannot get
her start as per earlier and upon inspection the choke plate is ALWAYS
CLOSED. if i then use something to physically hold the choke plate open
- no problem, she will start with a little rough idle for 1-3 seconds
probably due to the flooding...
so, having replaced the choke pull off, and the vacuum line to the pull
off, should i consider replacing the choke thermostat sensor or
whatever its called? it would make a nice paperweight i suppose, and i
could put a manual choke in... would i have to drill a hole in my dash
for that? could this POS be the source of the problem? it sure seems
like it since the pull-off doesnt seem to be the one actuating the
opening and closing of the plate when i am experiencing this problem...
at least she appears to be drivable and will start 'reliably' as long
as i have my little piece of wood handy(to prop open the plate). i feel
kinda stupid tho and would like to nail this problem so i can move on
to all the other issues... exhaust, valve cover leak, wheel alignment,
etc etc etc - she's a greedy jealous little bitc... err thing - just
like all my girlfriends, no wonder i'm already in love.
bennett

PS thanks esp to Mike and Roy for all their time and patience - and
kudos to you Bob, got it (at least partially) right on the first
guess...
RoyJ - 24 Mar 2006 15:56 GMT
Sounds like you need to deal with the carb.

First thing I'd do is ream out the idle tubes. this can be done on the
vehicle. Get a "drill style tip cleaner" at your local welding shop. $8
http://www.off-road.com/jeep/tech/engine/carter.html
Don't be afraid to ream these out a bit oversize, there was a factory
tech bulleton out on this.

See if the choke is fully closed to start, opensfully when it is warm.
Fix as required. You can set the pulloff rate (cool to almost warm rate)
later.

Pick up a carb kit based on the number tab on the carb. Inside are
instructions for setting the various levers and choke postions. These
are very specific to individual models. Maybe someone here can scan the
instructions and the spec sheet. Hayes and Chilton manuals only give the
general disassembly instructions, not the specs.

Just rebuild it on your kitchen table. It's been done many times before.
Just drain the gas before you bring it in!

Make sure your vac lines go where they are supposed to:
http://www.off-road.com/jeep/tech/258bbd/index.htm
http://home.sprynet.com/~dale02/vactails.htm

Your carb has a motorized mixture control system run off the computer.
Pretty problematic. New servo is $120 (!!!), odds are good it is not
working correctly. You can look down the carb throat, see the two
needles in the bottom shuttling in and out as you move the gas pedal or
spray a bit of carb cleaner down the throat. Some of the folks have put
the computer to sleep, modify the base of the carb to adjust mixture
with the standard mix screws that are currently hidden.

> can one of you Jeep gurus help me out? i have been given a 1987 Jeep
> Wrangler (4.2L 6cyl) and have been having trouble getting it to start
[quoted text clipped - 39 lines]
> thanks in advance.
> Bennett
 
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