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Unread 11-08-2011   #1 (permalink)
elgessi is offline Rookie


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Default 2002 mustang gt Idle problem

I know this problem is very common in mustangs. I read various threads on the forum. My idle is very inconsistent all day. I replaced my MAF and PCV. I checked my EGR and it was good as well. I cleaned my IAC but the idle continued to be inconsistent. Today it finnaly threw codes at me and their p0420, p0430, p1000, and p1125. ANy suggestions. Im thinking of purchasing a new IAC valve but i read on threads it still didn't fix the idle. THanks everyone!
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Unread 11-08-2011   #2 (permalink)
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to fix this problem, i went up the acceleration control a bit to keep the rpm in the 900, which is attached to the throttle body, I know that is not the correct way to fix it, but at least keeps the rpm normal while i solve the problem.
how do i know its in the 900, i used the gauges control..
hope this helps man
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Unread 11-08-2011   #3 (permalink)
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Dude look at the thred paj posted it has all the codes you need hope this helps .
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Unread 11-08-2011   #4 (permalink)
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Ok... This thread is borderline illiterate, but whatever.

CLEANING the IAC doesn't work.
REPLACING the IAC is recommended. Replace only with an OEM IAC.
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Unread 11-08-2011   #5 (permalink)
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Those codes have nothing to do with the IAC...
Your car is just a piece of sh*t.
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Unread 11-08-2011   #6 (permalink)
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Sounds like you need a new TPS and a pair of MIL eliminators for that offroad midpipe you're running.
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Unread 11-08-2011   #7 (permalink)
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Quote:
Originally Posted by BlueStreak03 View Post
Sounds like you need a new TPS and a pair of MIL eliminators for that offroad midpipe you're running.
If you read through the sticky at the top of this forum about the idle issues that are common that will start you on the right direction.... Also looking at your DTC codes that you posted should have given you another hint. TPS seem to have issues and cause idle problems. I don't think the codes for you catalytic converter would cause problems with your idle but who knows.
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Unread 11-08-2011   #8 (permalink)
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I just replaced my IAC valve. Now my Idle is super high! The car seem to run better but the idle will not drop from 2k. any suggestions??
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Unread 11-08-2011   #9 (permalink)
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Disregard my earlier post. I was crabby this morning.
What, if any, mods are on the car?
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Unread 11-08-2011   #10 (permalink)
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Quote:
Originally Posted by sillyrabbit0420 View Post
Disregard my earlier post. I was crabby this morning.
What, if any, mods are on the car?
I prefer that post, best answer I've seen here in weeks.
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Unread 11-09-2011   #11 (permalink)
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I got CAI, off-road xpipe, catback, SCT tune. I just thought by replacing the IAC it would fix my loping idle, but the new part just made my RPMs rise higher. Im at a point that I just dont know what to do.
Its funny when I'm at a red light everybody turns to see me because they think im reving it. hahaha
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Unread 11-09-2011   #12 (permalink)
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Quote:
Originally Posted by elgessi View Post
I got CAI, off-road xpipe, catback, SCT tune. I just thought by replacing the IAC it would fix my loping idle, but the new part just made my RPMs rise higher. Im at a point that I just dont know what to do.
Its funny when I'm at a red light everybody turns to see me because they think im reving it. hahaha
Have you checked all your vaccuum lines and made sure everything's the way it's supposed to be?
The TPS could be the issue.
Your codes are related to your off-road pipe. They're saying low catalyst efficiency because you have no cats. Either have them tuned out, or get some MIL eliminators as stated.
When you said you relpaced the MAF, what MAF did you replace it with?
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Unread 11-09-2011   #13 (permalink)
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well originally I had got fed up with this problem. So I took it to ford. They told me it was a bad MAF. I could not afford the OEM MAF. I bought a cardone MAF. I do not know why the catalyst is showing up in my DTC. I replaced the TPS about 2 1/2 yrs ago. My problem is that my idle is very high. I just can't find the damn problem.
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Unread 11-09-2011   #14 (permalink)
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Quote:
Originally Posted by sillyrabbit0420 View Post
Disregard my earlier post. I was crabby this morning.
What, if any, mods are on the car?
Quote:
Originally Posted by SoCal2V View Post
I prefer that post, best answer I've seen here in weeks.
Haha not the best Ive seen in weeks but very good.

I prefer the posts with super troopers references
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Unread 11-09-2011   #15 (permalink)
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Quote:
Originally Posted by elgessi View Post
well originally I had got fed up with this problem. So I took it to ford. They told me it was a bad MAF. I could not afford the OEM MAF. I bought a cardone MAF. I do not know why the catalyst is showing up in my DTC. I replaced the TPS about 2 1/2 yrs ago. My problem is that my idle is very high. I just can't find the damn problem.
(sigh...) Awesome.
To find out if your MAF is bad, just unplug your MAF... If the car runs like total dogshit with the MAF unplugged, then your MAF is working.
That's why I never let anyone else work on my stuff.

Anyway... That's stupid.

The catalyst is showing up on your DTC because you don't have cats, dude. What have you done with your rear O2 sensors?

Are you certain your throttle body is stock?
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