Stalling Rough Idle

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Nitebot - 21 Jul 2007 05:31 GMT

I have a 97 Ford Ranger 98k 2.3L 4banger manual.

I am having a ton of trouble and was hoping someone could point me in the
right direction.

The trouble started out one night on the way home from work, The truck
started up then stalled out right away. it took about 3 to 4 starts pumping
the trottle to get it to idle and stay running. After that no problem..Each
day it was the same thing 3 to 4 starts and alot of pumping to keep it to run.
If the truck is turned off you go throw it all over again.

I let this go for a time.

Start working on it last month , I've replaced the IAC, Throttle Posistion
sensor, Egr value, plugs wires, cleaned the throttle body, checked for vacum
leaks (as best as i could), changed out the battery, replaced air filter.

I've hooked it up to a reader, and get no fault codes.

After all of the above it runs when it wants to now..Taking upwards of 10
tries starting, the idle is ruff as hell till i guess it find the sweet spot
to run then its smooth.
I can try to start it a few times and disconnect the IAC and it will run..
However i haft to repeat that in each time..2nd it doesnt run well.

The MAS and EGR sensor can be disconnected and nothing changes. Running or
not.

At start up it idles for 1 second correctly then stutters chokes cluncks and
stalls.
Doesnt seem to matter if the vechile is warm or cold either.

I am honestly lost at this point, i cant aford to goto a dealer or a local
mechanic at this point, any suggestions ideas would be wonderful.

ive also taken back and exchanged all the above valves and sensors on the off
chance i bought a bad one.

Thanks for any help you guys could give out.

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David M - 21 Jul 2007 15:32 GMT

> I have a 97 Ford Ranger 98k 2.3L 4banger manual.
>
[quoted text clipped - 35 lines]
>
> Thanks for any help you guys could give out.

Check fuel pressure.

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David M (dmacchiarolo)
http://home.triad.rr.com/redsled
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tomcas - 22 Jul 2007 03:56 GMT

> I have a 97 Ford Ranger 98k 2.3L 4banger manual.
>
[quoted text clipped - 35 lines]
>
> Thanks for any help you guys could give out.

Did the check engine light come on because I'm surprised you aren't
getting any codes. It may not do sh.t but how about changing the plugs.
How did you check for vacuum leaks? There's a smoke method that might
work. If you have a rough idle you might find a leak using a hose on the
end of a propane bottle but if there was a vacuum leak it probably
would show a P0141 code. I recently had this code on a 2001 2.3L and
found the vacuum hose going to the fuel pressure regulator was cracked.

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Nitebot - 25 Jul 2007 02:08 GMT

Will be checkin the fuel pressure tomo or the next day if a friend shows up
with the tools. (hopes)

Yea getting no codes now, i got the mas but i replaced that already..New
plugs wires, that did help with the running smoother when i can get it to run
after the 10 plus starts.

I pulled most(all the ones i can find) of the vac lines off, hooked my air
compresser to them, and put them under water with my thumb holding the other
end..no leaks that i could find.

Like i said the 10 plus times to get it started is just silly, then once it
is runnin its a 50 50 chance it will run smooth enough to drive.

thanks for the help thus far guys, it is greatly appreciated.

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tomcas - 26 Jul 2007 04:28 GMT

You don't have to get that critical on checking the hoses for leaks. A
simple visual check is fine. If your fuel pressure was off you should
get a rich or lean code.

> Will be checkin the fuel pressure tomo or the next day if a friend shows up
> with the tools. (hopes)
[quoted text clipped - 11 lines]
>
> thanks for the help thus far guys, it is greatly appreciated.

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Nitebot - 30 Jul 2007 01:58 GMT

>You don't have to get that critical on checking the hoses for leaks. A
>simple visual check is fine. If your fuel pressure was off you should
[quoted text clipped - 4 lines]
>>
>> thanks for the help thus far guys, it is greatly appreciated.

No codes at all..Dont understand it to be honest.
Yea i did that with the vac lines at 1st, however people keep insisting it
was a leak..

Finally check the fuel pressure.

When the key is on and the pump kicks in it reads 40 psi .
Starting it drops down to 20 25 psi.. As you pump the throttle it jumps all
around.
Example as you open the throttle up the pressure drops to about 30, as you
let off the throttle it it build back up to 40psi..

But nothing higher than that..

So now my question is, what should the pressure be at..?
And does this vechile have a fuel regulator?

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Nitebot - 05 Aug 2007 02:39 GMT

replaced the fuel pump..and sending unit while i was at it.
Still the same.

check the gasket to the intake with starter fuild. No rev up at all..i know
thats not the best method to check it but only one i can come up with at time.

So whats left guys?

injectors?

at this point ive almost rebuilt this POS.

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Nitebot - 08 Aug 2007 08:35 GMT

Made some progress. Maybe this will help others out.

By starting the truck once and it stalles, then disconnecting tps and and
just connecting the old tps (with out mounting it). Starting the truck again
it stales again..Reconnecting the new tps and starting the truck will make it
run smooth as silk.
Now just disconnecting and reconnecting of the new tps wont allow the truck
to run, but when i do the above, it run smooth with out problems.

So the new TPS could be bad?

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