3.8 not runnin right!!! HELLPPP!! - TCCoA Forums
 
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post #1 of 30 (permalink) Old 03-10-2007, 08:57 PM Thread Starter
 
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3.8 not runnin right!!! HELLPPP!!

OK, MY GIRLFRIENDS 89 THUNDERBIRD KINDA PICS N CHOOSES WHEN ITS GONNA DO THIS!! ROUGH IDLE, STALLS OUT UNDER LOW RPMS (creeping along or at red lights) im not sure exactly what the problem is, and that frustrates me cuz im pretty mechanically inclined!!! lol and i really dont feel like playin the whole trial and error game!! could it be distributor, wires, (already replaced plugs), egr valve....im not sure!?!? would be nice if i could find an "easy" solution to this problem!!! CUZ I'LL BE DAMNED IF SHES DRIVIN MY 96' TO WERK!!!! LOL
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post #2 of 30 (permalink) Old 03-10-2007, 10:57 PM
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Is it throwing a CEL? The symptoms you described could stem from quite a few things.

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post #3 of 30 (permalink) Old 03-11-2007, 12:38 PM Thread Starter
 
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well.... i just got done replacing the cap and rotor, wires, egr valve, and throttle position sensor (i think its called!?!) it doesnt stall out now, PROBABLY WHILE IN PARK THE RPMS ARE AT 2 GRAND!!!! WTF!!!! im not sure what the hell is goin on!! the rpm issue didnt take place until i changed the throttle position thing!! i noticed in other threads ppl talkin about an "iac", but im not sure what it looks like to replace it! any help would be appreciated!!
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post #4 of 30 (permalink) Old 03-11-2007, 12:41 PM Thread Starter
 
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nope, no check engine light, im not sure why though. cuz theres something definately goin on!! maybe thats just the way 3.8s run!! lmao j/k
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post #5 of 30 (permalink) Old 03-11-2007, 01:02 PM
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Did you adjust the TPS that you replaced?

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post #6 of 30 (permalink) Old 03-11-2007, 02:51 PM Thread Starter
 
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uhhh, how do i do that!?! (never had to replace one of these before!!) i did notice that it had some kind of screw/spring inside, but no outside adjusting point.
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post #7 of 30 (permalink) Old 03-12-2007, 09:10 PM
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first, take a chill pill. second, start with usual suspects

tps - you can do this with a screw on the side with a allen wrench
mass air - clean it
idle air bypass valve (iac) - its ontop of the throttle body. take it off and spray some brake cleaner in it.
vacuum leaks - spray some soapy water while idling, and try to find any leaks.

those are some places to start.
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post #8 of 30 (permalink) Old 03-12-2007, 11:23 PM
 
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Quote:
Originally Posted by twol8uluz View Post
maybe thats just the way 3.8s run!!

LOL!
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post #9 of 30 (permalink) Old 03-15-2007, 06:50 AM Thread Starter
 
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where is the maf on these cars??? obviously not in the intake tube like my car!! lol
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post #10 of 30 (permalink) Old 03-15-2007, 10:14 AM
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no MAF on an 89 3.8 NA car.

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post #11 of 30 (permalink) Old 03-15-2007, 06:44 PM Thread Starter
 
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thats what i thought!!!!! and "stevinator"said the iac was on top of the throttle body? i replaced that and it was called a throttled position valve!!! sooooo, wtf? i dont know.... im goin with my previous thought........3.8s just run this way!!!!!!!!
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post #12 of 30 (permalink) Old 03-15-2007, 07:01 PM
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stop shouting. sorry, i forgot 89's dont have MAFs. the IAC goes by several different names. The real name is Air Bypass Valve I think, someone correct me if I'm wrong. Anyways, yeah its good you replaced it.
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post #13 of 30 (permalink) Old 03-16-2007, 12:05 AM
 
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Quote:
Originally Posted by twol8uluz View Post
throttle position valve
No. That is located on the side of the throttle body. The IAC is the black thing on top. It looks like this:

IAC:

Throttle Position Sensor:


=)
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post #14 of 30 (permalink) Old 03-16-2007, 12:44 AM
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Quote:
Originally Posted by scotteiboi View Post
No. That is located on the side of the throttle body. The IAC is the black thing on top. It looks like this:

IAC:

Throttle Position Sensor:


=)
now i know what i'm looking for

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post #15 of 30 (permalink) Old 03-16-2007, 01:23 AM
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Quote:
Originally Posted by The Stevinator View Post
The real name is Air Bypass Valve I think, someone correct me if I'm wrong.
Ford calls is an Idle Air Control Valve.

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post #16 of 30 (permalink) Old 03-16-2007, 01:30 AM
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Here's a top view of the IAC just to get a better idea.



And also another image. It's attached to the top of the throttle body, #16 in the pic.


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post #17 of 30 (permalink) Old 03-16-2007, 01:28 PM Thread Starter
 
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lmao!!! yup that thing you called the iac, they told me it was the tpv!! lol maybe their not up on their thunderbird parts lingo. but yeah, ok then... i replaced the"iac" then. and there wasnt a adjusting point on that... not that i seen anyways.
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post #18 of 30 (permalink) Old 03-16-2007, 04:05 PM
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Nope, nothing to adjust. Bolt on, reset the computer, and the computer will relearn where the IAC needs to be set at.

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post #19 of 30 (permalink) Old 03-17-2007, 06:37 AM Thread Starter
 
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by reseting the computer, you mean disconecting the battery, then reconecting it.... right!?!?
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post #20 of 30 (permalink) Old 03-17-2007, 04:37 PM
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Either that or remove the #15 fuse from the power distribution box under the hood, wait a few minutes, and then put it back in.

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post #21 of 30 (permalink) Old 03-18-2007, 03:31 PM Thread Starter
 
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ok.....well tried just about everything now. just tried the throttle position sensor, no change!! oh well i guess. but why isnt the cel comin on?? i dont get it!! at idle with car in park, the rpms are at 2grand.?
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post #22 of 30 (permalink) Old 03-18-2007, 03:59 PM
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there are only 3 things that can cause this, all involving air to pass by the throttle body.

1. Your throttle body's adjustment screw is open too much (not likely because that would only happen by twisting it yourself)

2. Idle Air Control valve is bad. (also not likely since you just replaced it)

3. Vacuum leak.

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post #23 of 30 (permalink) Old 03-18-2007, 08:35 PM Thread Starter
 
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yeah, ive thought of that too, but i cant seem to find anything out of the ordinary, (and the idle screw isnt even touching the "throttle plate" and still at 2,000 rpms!!im pullin my hair out tryin to figure out what appeared to be a "stupid problem"!!!
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post #24 of 30 (permalink) Old 03-18-2007, 10:30 PM
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Unless the new idle air control valve is bad, the only other thing that would keep it at 2k RPMs is a faulty or disconnected TPS sensor. No vacuum leak would be large enough to keep the idle that high without the engine stalling. And FYI that idle screw should be touching the throttle plate arm. I don't think that has anything to do with your problems but it shouldn't be like it is.

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post #25 of 30 (permalink) Old 03-18-2007, 11:58 PM
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im going to go with a faulty IAC. if it isnt a motorcraft one then get your money back and get an oem. something i have learned with these cars is they dont take likely to aftermarket parts.

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post #26 of 30 (permalink) Old 03-19-2007, 06:20 AM
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Was it idling high before you swapped out the IAC? If not, try swapping back to the old IAC. I bet the idle will drop back down. It sounds like you were given the incorrect IAC.

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post #27 of 30 (permalink) Old 03-19-2007, 07:16 AM Thread Starter
 
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well, i "tried" swapping out the iac, but when i did, the rpms were even worse!! the car was drivin itself!! (no joke, my girlfriend ran into the back of her moms car cuz her car wouldnt stop!! lol) so i took that one back and just tried cleaning the old one and just put the old one back on.
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post #28 of 30 (permalink) Old 03-19-2007, 12:10 PM
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yeah i agree with thomas. i've been down this road before. you either have been sold the wrong/faulty iac, or you have a massive vacuum leak and you dont know it. have you even checked for any vacuum leaks yet?
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post #29 of 30 (permalink) Old 03-19-2007, 12:43 PM
 
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Wow, you've got me frustrated just reading your post!
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post #30 of 30 (permalink) Old 03-19-2007, 09:20 PM Thread Starter
 
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yeah, the new iac proved to make no difference, so i took it back and put the old one back on. im gonna have to try n check for leaks, take it to the car wash or somethin!!
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