Hello everyone. I have a 1991 mustang gt that had several idle problems. Today I took it for a drive around 20 blocks. But I had the idle control valve disconnect. And the idle was good around 900 or 1000 .also it did not turned off on stop light also I pushed it hard that you can listen to the back tires peel out . On park the idle is around 1000 rpm.can eny one tell me way it ran better with the idle control valve disconnect. Thanks.
Idle control valve
- Thread starter miser143
- Start date
Check for codes. If the car idled well with the IAC disconnected you either have a vacuum leak or the base idle is set too high. A base idle reset is likely needed.
Please take the time on your response and use proper English and punctuation, your previous post is very difficult to read.
Please take the time on your response and use proper English and punctuation, your previous post is very difficult to read.
manicmechanic007
5 Year Member
Drive it for 5-10 minutes not 20 blocks
That's to get it to operating temp
If you have a vacuum leak they generally will run better with the IAC unplugged
Check the codes, pro like me would watch the O2 sensors switch using a NGS on your OBD1 1991
That's to see if it is "slammed" lean or not, see whether the O2 sensors "switch" not
We had to backprobe or use the breakout box before the NGS came out
That's to get it to operating temp
If you have a vacuum leak they generally will run better with the IAC unplugged
Check the codes, pro like me would watch the O2 sensors switch using a NGS on your OBD1 1991
That's to see if it is "slammed" lean or not, see whether the O2 sensors "switch" not
We had to backprobe or use the breakout box before the NGS came out
Go to the “Fox 5.0 Mustang Tech” section at the top of this section you posted in. Scroll down and the first thread in the “Sticky Threads” guides you on how to pull codes if you do not already know how to do this.
This is a good code reader if you do not already have one:
To set the base idle go to this thread:
Scroll down to post #2.
This is a good code reader if you do not already have one:
To set the base idle go to this thread:
Scroll down to post #2.
I'm interested in how long you have owned the car and what, if any, modifications done by you or the previous owner.
That tech forum is highly recommended and very usful, make me look like a hero mechanic.
That tech forum is highly recommended and very usful, make me look like a hero mechanic.
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