High Idel

[bpgardn]

Out of the blue my 89 blazer 5.7 tbi started ideling high even after it warms up.
Maybe about 1500 rpm above normal just enough to be annoying. Anyone have an idea why?
Thanks Brett

 

[Can Can]

Take a close look at your vacuum lines. If it happened out of the blue, there's a real good chance something came apart somewhere.

 

[bpgardn]

Thanks but all lines seem to be fine

 

[Can Can]

Have you checked at the base of the throttle body for vacuum leaks?

 

[bpgardn]

No Ill give that a try
thanks

 

[Russell]

Could be a bad idle air control valve, coolant temp sensor, vaccum leak or any number of other things

 

[bpgardn]

Where would I find the idle air control valve

 

[Russell]

Round cylinder on the front pass side of the throttle body, has 4 wires through a square connector