Home | Contact Us | FAQ | Search & Site Map | Link to Us
Sign In | Join | Other 45 Sites in Network
HomeAnnouncements
Discussion Groups
By Brand
BMWChevroletDodgeFordGMHondaLexusMercedes-BenzNissanPeugeotToyotaVolkswagenOther Brands
By Topic
4x4 CarsRVsDrivingMaintenance & RepairCar AudioCollectible Cars
Country Specific
Australian ForumsUK Forums
ArticlesAuto InsuranceBuyingCars & TechnologyMaintenanceMiscellaneousSafety
DMV Resources
Related Topics
MotorcyclesBoatsMore Topics ...

Car Forum / Ford / Ford Trucks / March 2006

Tip: Looking for answers? Try searching our database.

PCM Question........

Thread view: 
Enable EMail Alerts  Start New Thread
Thread rating: 
Mfatoldsun - 23 Mar 2006 23:58 GMT
Do PCM`s go bad on a 1988 Ford F-150 4.9L? I believe mine is no good.
Thanks,

...mfat
Al Bundy - 24 Mar 2006 01:12 GMT
> Do PCM`s go bad on a 1988 Ford F-150 4.9L? I believe mine is no good.
> Thanks,
>
> ...mfat

Keep the faith, fat. If it lasted 18 years, why would it go bad now?
Don't tell anybody why you believe your's is no good. Maybe it's just a
bad connection or the nut at the wheel. I suppose you could have one of
the parts stores check it for you, but they are sometimes wrong. It's
time to just start changing parts until you hit on the bad one.
Mfatoldsun - 25 Mar 2006 15:26 GMT
<<Maybe it's just a
bad connection or the nut at the wheel.>>

What do you mean by that?

<<It's
time to just start changing parts until you hit on the bad one.>>

Hahahaha i`m doing that now, but the parts arn`t cheep! That distributor
module was $123.00! I can get a used PCM for $75.00 Is it worth a shot?

...mfat

>> Do PCM`s go bad on a 1988 Ford F-150 4.9L? I believe mine is no good.
>> Thanks,
[quoted text clipped - 6 lines]
> the parts stores check it for you, but they are sometimes wrong. It's
> time to just start changing parts until you hit on the bad one.
Al Bundy - 25 Mar 2006 23:44 GMT
I was just having fun, mfat.
I'm against just changing parts and believe you should have it scanned
for nothing at the parts store. However, If I have a vehicle that I
intend to keep, I actually don't mind some parts guessing on items that
commonly go bad. I save the old parts and eventually try to use
everything up. It's nice to have extra parts to swap in when a problem
develops.
pkurtz2 - 24 Mar 2006 18:35 GMT
> Do PCM`s go bad on a 1988 Ford F-150 4.9L? I believe mine is no good.
> Thanks,
>
> ...mfat
Mfat,
Yes PCM's do go bad. Especially since yours is 18yr old. At that point it
becomes like a bad step child that wont leave home.. LOL  Although I am with
the other guy on wondering why you think yours is bad? On the 88 it is goin
to be EEC IV so you might want to just go to a shop and have them check it
out. Keep in mind though, that there are alot of sensors that tell that PCM
what is goin on, and if they are feeding bad info to the PCM then it will
act like its bad, but its just a sensor in that case. Trust me, have someone
with a scan tool check it out and see. Hell the truck just might need a tune
up. It is 18yr old afterall.. LOL
Mfatoldsun - 25 Mar 2006 15:24 GMT
<<Trust me, have someone
> with a scan tool check it out and see. Hell the truck just might need a
> tune up. It is 18yr old afterall.. LOL >>

Hey!
Well here`s the scoop:
I just bought a 1988 Ford F-150 with a 4.9L 5 speed, and It has this crazy
electrical problem. I knew that the truck wouldn`t run before I bought it,
but the price was right ($500.00) with 118,000. The truck will not start and
has weak spark. The distributor module has been replaced with no luck. If I
leave the key in the "On Position" the fuel pump will run erratically, and
the fuel pump relay "clicks" very quickly and erratic. Under the washer
bottle, there is a wire harness that runs under it, and branches off on top
of the left front wheel well with 3 connectors. The biggest connector with
12 pins (roughly) was corroded. I cleaned it, and still no luck. So then I
inspected the other two connectors that are right next to the 12 pin
connector, and they appear ok. Is there a common break in the harness? In
that harness, is the wiring for the coil/distributor/and fuel pump together?
Visually inspecting the harness, it looks ok.  The truck seems to "flood"
from cranking because the fuel pump is always energized. Smoke does come out
the tail pipe, so there is little spark. I replaced the distributor module,
and the pickup inside the distributor, still no go. I replaced both EEC
relay, and the fuel pump relay, still no go. SO it leeds me to believe it`s
the PCM. I took it apart, and nothing looks burned, but what else could it
be? I have all my grounds, and power sources at the relays and so forth. I
even replaced the pigtail on the front fuel pump. I`m at a loss!!!!!!!!!!
Thanks,

...mfat

>> Do PCM`s go bad on a 1988 Ford F-150 4.9L? I believe mine is no good.
>> Thanks,
[quoted text clipped - 10 lines]
> me, have someone with a scan tool check it out and see. Hell the truck
> just might need a tune up. It is 18yr old afterall.. LOL
Mfatoldsun - 31 Mar 2006 23:49 GMT
Guys,
The PCM fixed the problem. It was causing loss of ground throught the
harness. I got a junk yard PCM for $70.00 she fired right up. SO
HAPPY!!!!!!!!!!!!

!!!!!!!!!!!!FORD!!!!!!!!!!!!!!!!!!

...mfat

> <<Trust me, have someone
>> with a scan tool check it out and see. Hell the truck just might need a
[quoted text clipped - 45 lines]
>> Trust me, have someone with a scan tool check it out and see. Hell the
>> truck just might need a tune up. It is 18yr old afterall.. LOL

Rate this thread:






 
Sign In
Join
My Latest Posts
My Monitored Threads
My Blog
My Photo Gallery
My Profile
My Homepage

Start New Thread
Enable EMail Alerts
Rate this Thread



©2008 Advenet LLC   Privacy Policy - Terms of Use
This website includes both content owned or controlled by Advenet as well as content owned or controlled by third parties.