Sometimes when I am coming to a stop in my 5sp 2k max, the revs of the engine will drop below 500rpms to about 200rpms where the car almost dies. It also does that when i push my foot on the clutch and let the revs drop. I also noticed on startup sometimes, my car will DIE or will BARLEY start. It starts and then the revs drop to about 200 or so. is it my idle air control valve?

 

Sounds like a coilpack problem. Might also be MAF or your IACV.


...or you could be out of gas like I was.

 

I thought if it were an IACV problem, the engine will idle at high rpms.. (somewhere around 1100ish). Thats what happened to me. I would try to do the re-learn procedure first.

 

how do i tell the car to relearn? and is it hard for me to learn how to do this?

and it happens anytime, not just when i am low on gas

 

disconnect the battery and leave it whole night?

 

its not the iacv, that would cause high rpm like mentioned earlier, most likely the sensor next to the tps on the throttle body (forgot whats its called), common problem on the vq30 engines.

the relearn procedure works on throttle by wire, but you have a throttle by cable so do worry about that.

 

I also have similar problems, inconsistent rev dropping, high rpm (1100-1300) for about the first 3 minutes of driving. However I bought the car used and have service invoices for a replaced IACV and all six coilpacks. Ive seen the throttle relearn procedure and heard of reducing the slack in the cables (not sure what this intitles tho). I havent tried either and cant access the relearn write up due to new forum server. Recently Ive noticed a substantial loss in power, and will be buying a new MAF from DaveB soon, however dont know what to do further.

 

You need to relearn idle speed. Unplugging the battery won't do. Also, the procedure didn't work for me, so I had a guy from the org do it with Autoenginuity pice of software do it. I had that problem for over a year. Its not an IACV either... If the relearn works, great, if not find someone in with Cipher or the other tool to reset it for you. Dealer would do it too, but your wallet will feel ligher, after they'll make you change blinker fluid.