Recently, my car has been idling between 1400 and 1800 rpm. Only happens when I stop and car is in neutral. No vac or boost leaks either. Anyone ever have this type of problem? I've searched and read idle problems like rpms dropping, stalling but never up and down. I recently got gsc 272 cams installed and car runs great. Only problem is idling at stoplights.

 

Hmm well because I don't know the answer, I'm going to stab in the dark with some questions so that maybe people get a more descriptive idea of whats going on.

Is the idle rough as in it sounds like its lobing through it, like a car would that has cams?

blop blop blop blop type of thing (haha make fun of me, but i think it sounds like that)

Or is it more of a rev up to 1800 then falls down to 1400, again and again when you're stopped?

I hope your question gets answered!

 

Idle screw off. adj. it. iac. controller is bad, vacuum leak, cam sensor is off. You have a vta bov.

 

using an MR crushed bov. The cams do sound lopey but I guess its normal for 272's. maybe if the rpms are below 1000 it would sound like blop blop blop blop. Its more of a rev up to 1800 and down to 1400. My tuner(Sean Ivey) said it's the iac controller that needs to be replaced so I'm taking his word for that. Going to see him next Sat.

 

As I said. Dont beat the car till them.

 

i have the same idling problem in my car. cept its bone stock. when im at a light in neutral my rpms will jump up to 1500, or drop down to about 800..like the cars about to bogg out and stall. doesnt happen everytime, but often enough.

 

Car just threw a p0507 and p0134. Damn one problem after another

 

can't this be fixed by just getting a tune-up?

 

i believe i have a similar if not the same problem...thought it was due to cold weather but only really does it for the first like 5 minutes my car is running. Anyone know what this is?

 

a p0507 indicates too high an rpm at idle right? That could also mean my iac motor is on its way out or should adjusting idle screw(i've never done this yet and don't know where the screw is) fix it? In regards to p0134, how do you tell if its the front or rear 02 sensor thats causing it?

 

Same thing used to happen to me... if i was at WOT and came to a stop it would drop down in the 1000's and then come back up since i changed my spark plugs hasnt happened to me check it out might work for u guys...

 

That is the front 02 sensor, and like I told you, the ISC motor is acting wierd time to swap it.

Sean

 

Yep, isc is out. Same thing happened in my dsm.

 

Looking forward to seeing you Sat. for the iac swap. Damn is it Saturday yet?

 

i have the same problem. let me know how it goes.
my car has been like that for the past few weeks.
i need to reset the ecu by disconnectly the battery.