Warm Idle Problems

J

Joisey Jim

Guest
After a short run and parking the car the engine starts, but idles poorly and will stall. I also get a smell of gas. If I give it some gas pedal and drive off right away it clears. If I have to reverse, it gets a bit tricky because you're not using much gas pedal. I was thinking it might be the IAC getting stuck closed, instead of the usual stuck open, high idle & hooting sound. What do you think.
 
Almost sounds like either a bad fuel pressure regulator, or maybe a bad injector.

Sometimes with a bad FPR, if you pull the small rubber vac line off of it, if there's any trace of gas in it, then the FPR is bad and leaking fuel past the diaphragm.

Or it might be a bad injector that doesn't close completely. When you shut the car off, the residual fuel pressure will leak completely into that cylinder, which will cause it to run rough on startup.
 
Back
Top