My S40 model 2003 changes the idle when the engine is warm and when I'm pressing Fuel pedal..

please help

 

any check engine fault codes? a wandering idle can be caused by a few things - dirty MAF, throttle body issues, intake or exhaust air leaks, fuel pressure regulation etc. You'd need to get some extra info to diagnose. Easiest thing to do for starters is to look for any tears in the intake air tubing or vacuum lines. A smoke test may be needed to find some of the harder to spot issues. Try spraying around the intake tubing/intercooler etc with some carb cleaner to see if it gets sucked in or bumps the idle.

 

Thanks mt..
which fast and easiest way to communicate with you...?

 

That 4 cyl engine has an electric valve that controls the idle speed. I have replaced many that went bad and made the cars stall.

Here's what they look like - have no idea if that's a reasonable price.

https://www.autohausaz.com/pn/18038_...AaAmTUEALw_wcB

might be a bad link here's a new picture

https://www.carparts.com/details/Vol...B&gclsrc=aw.ds

 

interesting just like my old K-Jet which had an idle air valve that would gum up or die. LOL, I think I still have one in my parts box from my 84 Quattro.