1995 Yukon High Idle

[Steven94]

My 1995 Yukon is having a high idle issue and I've already replaced the EGR valve, EGR Solenoid, TPS and its still having issues any help is appreciated.

 

[B-train]

Check the gasket under the TBI unit. They are known to crack and disintegrate with age. This will cause a huge air leak and allow it to run faster. Thise didn't use MAF sensors, so the engine doesn't know it's getting more air than it realizes.

 

[Eman85]

95, is it a Vortec engine? If TBI then it's most likely the throttle body gasket. If you have a scan tool check IAC and see if it's being commanded closed, if so it's a vacum leak. A smoke generator is a good way to test for a vacum leak, easy to make one from PVC pipe and Youtube videos.

 

[exp500]

Read the manual section for resetting Idle Air Control. Thats 1st step.