1,800 to 2,000 RPM idle in neutral - Mustang Evolution

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Old 06-04-2008, 11:18 PM   #1
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Thumbs down 1,800 to 2,000 RPM idle in neutral

What could be the cause of this? I have already had the coolant sensor changed, the ACT sensor changed along with PCV Valve, PCV valve mesh. Sometime ago i cleaned the IAC and throttle body but this time it didn't work. Could it be that I need a new IAC? Could it be from a small anti-freeze leak from waterpump gasket?
This is for a factory 1988 Mustang 5.0 GT.

2: Well the problem went away for a few months now with the weather change it has returned.2:
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Old 06-05-2008, 09:20 AM   #2
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Re: 1,800 to 2,000 RPM idle in neutral

you checked the timming to see how its set
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Old 06-05-2008, 09:37 AM   #3
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Re: 1,800 to 2,000 RPM idle in neutral

Timing advance should be between 8 and 14, much different from that could cause idle issues

My 89 would 'stick' or 'hang' at 1200-1500 quite often, after replacing the IAC it was fine for about a year then started doing it again... wouldn't hurt to try a new IAC... Idle set screws should be fine... try the idle relearn procedure...
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Old 06-05-2008, 12:00 PM   #4
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Re: 1,800 to 2,000 RPM idle in neutral

is that you in the avatar? if so ill just fly over and take a look for ya
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Old 06-05-2008, 02:30 PM   #5
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Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by SimplyOrangeTPS View Post
is that you in the avatar? if so ill just fly over and take a look for ya
Book Rob and myself a seat
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Old 06-05-2008, 02:31 PM   #6
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Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by Herbstang View Post
Book Rob and myself a seat
Yeah, someone will need to supervise that youngin....
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Old 06-05-2008, 11:36 PM   #7
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Question Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by SpectorV View Post
you checked the timming to see how its set
It's at 11 degrees where it has been for many many years before this idle problem came along.
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Old 06-05-2008, 11:38 PM   #8
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Re: 1,800 to 2,000 RPM idle in neutral

ntopic:
Quote:
Originally Posted by PureVenom View Post
Yeah, someone will need to supervise that youngin....
ntopic::feedback:
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Old 06-05-2008, 11:40 PM   #9
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Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by MonteCitan View Post
Timing advance should be between 8 and 14, much different from that could cause idle issues

My 89 would 'stick' or 'hang' at 1200-1500 quite often, after replacing the IAC it was fine for about a year then started doing it again... wouldn't hurt to try a new IAC... Idle set screws should be fine... try the idle relearn procedure...
I was thinkin of getting a new IAC as I have already cleaned t his original IAC and throttle body but it didn't help this time. I believe LateModelRestoration sells it for $89.95 and hopefully it is a Ford part.
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Old 06-08-2008, 03:32 PM   #10
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Re: 1,800 to 2,000 RPM idle in neutral

just pick one up at your local auto-junk parts store. I think thats going to be your best bet, sure sounds as if your IAC/IAB is hanging open... they will be cheaper than 50resto.

can I ask another question though? why is your base timing set at 11?
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Old 06-09-2008, 03:45 PM   #11
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Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by Mercedez L. View Post
ntopic:
ntopic::feedback:
oh wow.... rob, herb, and jarod... good god i never seen someone get shutout so quick lol

QUICK!!! PURGE THE NOS! lmao
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Old 06-10-2008, 01:18 PM   #12
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Re: 1,800 to 2,000 RPM idle in neutral

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oh wow.... rob, herb, and jarod... good god i never seen someone get shutout so quick lol

QUICK!!! PURGE THE NOS! lmao
Then you should have been at Joe Wheeler
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Old 06-10-2008, 01:29 PM   #13
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Re: 1,800 to 2,000 RPM idle in neutral

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Originally Posted by Herbstang View Post
Then you should have been at Joe Wheeler
Yeah, no kidding....

Then again, I wasn't talking about her anyhow so...it doesn't matter to me. I was referring to the youngin' Jarrod....
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Old 06-10-2008, 02:04 PM   #14
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Re: 1,800 to 2,000 RPM idle in neutral

ppsshhhht...ppsshhhht, hey ill drop it when i find out the answer to my question.

i aint no youngin'

yea just buy one from auto-zoo or something...sooo is it you or ur girlfriend???
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