Author Topic: Rough idle/stalls when started warm?!?!?! (Read 3889 times)

91e30181 · « **on:** January 17, 2009, 09:39:28 AM »

If I start it when the motor is cold, everything is fine. But when I start after the motor has been run, even if its just for a minute, its spits and sputters with the revs jumping between 300 and maybe 1200 requiring you stay on the gas to keep it from dying out. If I start it and try to take off while its doing this, it will have like 3 horsepower and then once it passes 2,000 RPM be just fine. No matter what you do, the problem lasts about 1 minute and goes completely away. Is this some problem with a cold start valve or something like that? Thanks

xwill112x · « **Reply #1 on:** January 17, 2009, 09:43:04 AM »

sounds like a huge vaccum leak/icv to me...

try cleaning your icv and replacing all your cracked hoses.

that should fix your problem...if not get back with us.

91e30181 · « **Reply #2 on:** January 17, 2009, 09:46:03 AM »

I just bought this one a month ago, and its spent that whole time getting paint. Now thats done I wanna look further into this. Im gonna tear it down hopefully next weekend. Hoses are pretty new and I dont hear any vac leaks. Whats the icv?

xwill112x · « **Reply #3 on:** January 17, 2009, 09:52:20 AM »

idle control valve.

you could just buy a new one, but there like 168$$ new. so if your anything like me, id rather try cleaning/fixing it first.

but the intake manifold hides manyhoses and lines...i'd just visually inspect all the hoses i could, and if they look new...maybe it's just your icv

91e30181 · « **Reply #4 on:** January 17, 2009, 10:13:53 AM »

Yeah my other e30 I had to replace all the hoses, so Im familiar with the process. Idle control valve...gotcha...its the morning so Im not all there just yet. Its been cleaned so I guess replacement is the next step, and $168 isnt so bad really, just as long as it works!

xwill112x · « **Reply #5 on:** January 17, 2009, 10:32:15 AM »

try cleaning it with electrical cleaner?

if it works...

then you can give me the 168$$

91e30181 · « **Reply #6 on:** January 17, 2009, 03:42:31 PM »

Oooh tried that, so no $$$ for you....but thanks for the help!

xwill112x · « **Reply #7 on:** January 17, 2009, 06:51:55 PM »

hmmmm....make sure all hoses are secure?

Burnall4 · « **Reply #8 on:** January 21, 2009, 01:12:54 PM »

welcome to the club...search my massive thread and you will see all that suffer. Some people have figured out their problems, some haven't. I am just looking for the definitive answer.

Can you accelerate when it starts doing the rough idle, because I can't.

AcSchnitzer318is · « **Reply #9 on:** January 21, 2009, 09:33:20 PM »

^What he said. Lot's of ppl been working on this for awhile. I'm betting the ICV and new hoses don't fix your problem if you can't hear a vacuum leak and have already tried cleaning the ICV.

I was hoping that fuse box thing would turn out to be the answer... haven't heard anything about it since.

roundel318 · « **Reply #10 on:** January 24, 2009, 09:50:50 AM »

When you start it up warm, how does it do at WOT? (Wide Open Throttle)
I ask because O2 readings are tossed at WOT......