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More info is needed here, but the idle air valve is the first component that comes to mind, followed by vacuum leaks. Is this a '98 or an' 87? The post says both!
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Hi Paul:
Here are my random observations:
- 2500 to 3000 is really high for "idle"
- Putting it into drive or reverse engages the transmission and puts load on the engine through the torque converter. Since the RPM is high enough that the vehicle thinks it should be moving, the transmission will engage and rpm will drop since more power is needed.
What to do? How long since tuneup?
History? Did this just start immediately, or did it sneak up a bit at a time.
Make, model, engine, year, Kms or miles. Give us some info and someone who is a better transmission specialist will probably kave some more ideas.
Cheers.
The vehicles computer will adjust the idle according to how the manufacture programmed it
After about one mine or so, the idle on most vehicles comes down to approx 750RPM, generically speaking
When you put the car in gear,assuming it is an automatic, the rpm will drop a 100 at most & may be adjusted by the computer, just as it does when you put the A/C on. That is to compensate for the change in engine load
You should be waiting for the rpm to come down to 650 to 800 & then a couple more minutes for some temp to come up, before driving off. In cold weather wait at least 5 min or more
I think your vehicle is not working correctly, or you not explaining it in a way I understand what answer you want
Well, the computer is supposed to open the IAC to keep the RPM above 600 or so depending on the load on the engine. If you have voltage and ground for the IAC it should raise idle speed to at least 1100 when you first start the engine cold. If that is not happening, I would look for carbon build up in the throttle body. You can apply voltage to the IAC and open it to see if the air passage is open too.
I believe you have a transmission mount that is bad, possibly and engine mount. When you are shifting the engine will raise and bump the firewall, floorpan.
Good luck
sounds like the idle air control is either clogged with carbon or it is bad. take iac off and clean out the passage way to engine. do not put valve in any liquid, only the end of valve can be cleaned were valve is. do not push on valve while cleaning or the adjustment will be messed up.depending on the size of engine it should idle at about 650 to 700 rpms.I have a 3.1 and it idles at 650 rpms,
Sounds like the torque converter clutch solenoid is bad. Unplug it and see if the problem stops. Unplug the 4 wire plug on the front of the transmission.
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