I was about 30-40 miles into my 150 mile trip from Santa Cruz to Sacramento today, when I pulled over to eat. Traffic had been mild the whole time although the first 20 miles is a twisty mountain road uphill and downhill. I should also mention I have a turbo timer that runs for a minute after I pull the key. Anyway, the car scared me when, after I had finished lunch(about 20 or so minutes), the idle was really rough for 30-90 seconds... by rough, I mean it jumped around from 500 to 1000 rpms. Any idea what this might be? thanks!

PS: Yes I'm running 91 octane, yes it's had it's oil changed in the last 2500 miles, exhaust temps were normal.

 

2500km= time for another oil change.

 

TPS out of adjustment...
Intake vacuum leak...



-Ted

 

My car does that after getting it hot...maybe not that bad but it does idle low for a few secs. I think it's a combination of heat soak and leaking injectors (or ECU code that spray too much fuel) on my car anyway.

Todd

 

Car has a brand spanking new TPS... Unless these things slide out of adjustment all the time, it should be ok... intake vacuum, maybe, can anybody point me in the direction of some literature on this? or maybe a quick run down of how it works/affects my idle? I don't hear any vacuum leak hisses under the hood, so my guess it's not that. Not familiar with heat soak? thanks, you guys are great!