Quote:
Originally Posted by orange4boy
Have you checked the TPS? The little I know about this stuff, That's what comes to my mind. Also high idle can be the battery recharging or a dead cell. Battery good?
This is the crow giving advice to the eagle.
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It's cool, I can take advice from anyone, cuz you might think of something I didn't.
Unfortunately, it's not throwing any other codes than the 1640, so until I chase that down, I can't really bother diagnosing anything else, because it would be a matter of tossing parts (and money, of course) at it. I bought a new ECT for it because that's one of the major things that goes out all the time, so I've thrown $25 at it already. It didn't fix the problem, but it made it better. It idles (sitting still) normally now, but it doesn't like idling normally when started warm, or when in neutral moving.
Neutral moving is a simple thing - it always points to IAC. When you're moving in neutral, with AT vehicles, the IAC is opened slightly to deaden the shift shock of going back into gear by compensating with some engine speed/load. If the idle is excessive while moving, it's almost always the IAC motor/solenoid, either bad or not seating/sealed correctly. (Which is basically a vacuum leak that the PCM will compensate for.)
The warm start high-idle could be a TPS issue, and it could also be a IAC issue. Once warmed up, the PCM may not be returning the IAC to it's closed loop idle position immediately (slow IAC, slow signal, etc.) for some reason or another, or again, dirty TB stopping the IAC from moving to where it should be.
I think Monday, after I redneck fix the ball joint with some grease to get it inspected, I'll pull the TB off and clean it up, or replace it w/ the other one I have. Now that I've got oil worked through the engine thoroughly, I'll also change the oil and cartridge filter to the Pennzoil Platinum 5w30 that I bought for it. Changing the oil and cleaning the TB and plugs (a basic tuneup) should help out alot.
Those are some of the first things one should do before assuming that something needs to be replaced... second would be removing and cleaning/inspecting all the sensors' connections.