idle

[ciklude22]

I have a h22 and I have had no problems for the past two years now and last week I added on a crank and alternator pulley from unortho and now when I throw my car in nuetral and is still rolling my car idles up and down from 700 to 900 rpm but once I come to a complete stop she ildes perfect and doesn't go up and down. It only does it when I am rolling to a stop in nuetral and not when I am at a complete stop. I thought is was my idle air contol valve but wouldn't it do it at all time especially at a dead stop. The only thing I can figure is that the alternator is putting out a signal that the crank is turninig to slow now since the crank pulley is smaller and that is wanting to compnsate the voltage but why wouldn't it do it at a dead stop. I'm all messed up in the head and I need some help !!!!

[Prelewd]

I can't really answer your problem, but from what I hear, crank pulleys are BAD for your engine.

EDIT: found some common problems with crank pulleys.

-They rotate faster, being smaller, thus causing your alternator to wear out quicker from being run faster. Could be one cause for your jumpy idle.

-Most crank pulleys do not have a vibration dampener, and put unnecessary strain on your bearings as it doesn't keep them balanced.

There are probably more problems, but that's just something to get you started on. A jumpy idle from 700-900 doesn't seem like that much of a problem, but if I were you, I'd probably go back to a stock crank pulley.

[88 ROCKET]

Your crank and cam position sensors are all out of wack... and alt. over reving giving your ECU a reading that it can't compensate for. go back to stock... it will save you from expensive repairs in the not so distant future.

[ciklude22]

How would it mess with my crank position sensor? Doesn't it only reads the position of the crank. What sensor do I have for the cam? The crank pulley is alot smaller than the stock one so that would rotate the alternator pulley slower or less times than the stock pulley would. I think thats right