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Old 04-06-2016, 02:39 PM   #1
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Sticking idle

98 gt. I just started using 93 octane. The car runs so much better on it I could definitely feel a difference. But now my idle hangs at a high RPM when I'm driving and If take my foot off the gas it will still hang and if I push in the clutch it will still hang for a while and then slowly come down as well. Any ideas on why. The car idles perfect at a stop. Thanks

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Old 04-06-2016, 05:57 PM   #2
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Check your Idle Air Control Valve. They are a pretty common problem and cause a hanging idle.
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Old 04-06-2016, 06:11 PM   #3
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Originally Posted by clean4.6gt View Post
98 gt. I just started using 93 octane. The car runs so much better on it I could definitely feel a difference. But now my idle hangs at a high RPM when I'm driving and If take my foot off the gas it will still hang and if I push in the clutch it will still hang for a while and then slowly come down as well. Any ideas on why. The car idles perfect at a stop. Thanks

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Would it make a noticeable different using 93 octane even without a turner?

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Old 04-06-2016, 09:44 PM   #4
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How would I find out if it's tuned. I got the car from a guy I did work on his house. It was his sons car and he gave it to me as payment. He said he didn't know what was done to car. Except for exhaust, 373 gears, it's set up for a wet shot. It also has a cold air intake. I was running 87 and it was running sluggish. I switched to 93 and u can really feel a diffrence.

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Old 04-06-2016, 10:07 PM   #5
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Would it make a noticeable different using 93 octane even without a turner?

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No it doesnt. If youre not tuned for 93 then it wont. Its just kind of a waste of $ to me if your car doesnt call for it to begin with. If you have raised the compression of the motor than yeah you will need it. But on a normal 87 octane designed engine it won't benefit you to run it IMO.

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Old 04-06-2016, 10:17 PM   #6
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Also OP, it does sound like you should start with cleaning your IAC and see if that helps. A bad one or dirty one can cause stupid issues with your idle. May as well clean the MAF too while your at it. IAC seems to be a common replacement item on these cars when their older, several threads on ME about it. There are you tube vids on how to clean both and what to use

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Old 04-07-2016, 07:34 AM   #7
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+1 To the IAC.
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