Surging at idle

[sho 'nuff]

I've noticed within the last few days that after I have been in my car for 15 minutes or so, when I come to a stop the engine makes this repetative noise and the car surge ever so slightly to the same repetition of the noise. If I have the car in park I don't feel the surging but I can still hear the noise. From what my ears could make out the noise seems to be coming from the driver's side of the engine bay. The noise is sort of hard to describe, its not a constant pinging or a clanking...its more of a pulsating/rotating sort of noise. Help.

 

[SHOfun 93]

Sounds like a throttle position sensor to me..but I could be wrong..

 

[Mike Kopstain]

My guess is the idle air bypass motor.

 

[sho 'nuff]

Think this is something that would throw a code?

 

[bigdaddy]

Sounds to me like your idle air bypass valve.Ford issued a TSB on these valves,# 92-5-6.Install a new valve Ford # FODZ-F715-A.GOOD LUCK!!! P.S. Anyone needing factory info ie:TSB's,etc. Please contact me i have connections.

 

[sho 'nuff]

ttt...so is this something that should give me the dummy "check engine" light?

 

[Mike Kopstain]

No check engine light for this. A good cleaning should do you fine.

 

[sho 'nuff]

Thanks you guys...I'll see what I can do with it tomorrow, after checking the SHOTIMES f.a.q. and searching the forum on how-to clean the IAB valve.