Idle issue (more detail)
#1
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Idle issue (more detail)
I've been having an idling issue on my 95' z28. It started doing it one day and hasn't stopped since.
The issue: basically I have a high idle during start up and when the car is rolling, it then slowly comes down when the car comes to a stop.
1. It hangs around 2k at startup and slowly falls to 1500 when cold, around 1100 when warm.
2. It will hold at between 1500-2000 in neutral when the car is rolling.
3. It will drop down to between 1300-1500 when it comes to a complete stop.
4. If you blip the throttle a bit it will idle between 900-1100 after coming to a stop. This is only when it's warm. Sometimes it will slowly creep back up, other times it will stay down.
5. I replaced the iac valve and there'sno change. Should I reset it?
6. I've checked pretty extensively for vacuum leaks and haven't found any.
The issue: basically I have a high idle during start up and when the car is rolling, it then slowly comes down when the car comes to a stop.
1. It hangs around 2k at startup and slowly falls to 1500 when cold, around 1100 when warm.
2. It will hold at between 1500-2000 in neutral when the car is rolling.
3. It will drop down to between 1300-1500 when it comes to a complete stop.
4. If you blip the throttle a bit it will idle between 900-1100 after coming to a stop. This is only when it's warm. Sometimes it will slowly creep back up, other times it will stay down.
5. I replaced the iac valve and there'sno change. Should I reset it?
6. I've checked pretty extensively for vacuum leaks and haven't found any.
#3
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I have the EXACT symtoms as you, only slightly lower rpm amounts... I too replaced the IAC and did the reset... along with a **** ton of other parts and the symptom remains. Once in a while the car will stall while cold and idling...but it wont stall if I blip the throttle a couple times while its cold....then it does what it should. Idles around 1100 or so, idles down as it warms up. I think the two are related some how. Other than that the car runs flawlessly.
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The high idle (2000rpm) whenever the speed sensor is reading speed seems to just be a 6 speed thing. However, I would check the throttle blades/linkage for binding or carbon build up. Mine does the same thing, but when you come to a stop it settles back down to under 1000 rpm (stock cam). Hope this helps, Eric L