random high idle in park

[dizzymae]

My 96 Saturn has been driven and put in park idle increases to 2000RPMs. after about 20 seconds drops back down to normal idle and then increases again. It was random now it is doing it regularly. But only after it has been driven.Any ideas,

 

[dizzymae]

forgot to mention it is automatic transmission. help anyone??

 

[blah blah]

forgot to mention it is automatic transmission. help anyone??

Your Idle Air Control valve may be carboned up. Clean it, your EGR valve, and your throttle body. Dont know what your current mileage is but in the future post that and engine type as well.

 

[Joe (5)]

defective coolant temperature sensor can also cause this.

 

[dizzymae]

tactometer climbs from 1000-3000 in 10 secs,returns to 1000 slowly, after coming to a stop and putting transmission in park. now it feels like it maintains 2200 rpm most of the time and like the gas pedal is feeding the engine even when i am coming to a stop sign Mileage is 130,000 have changed temp sensor, cleaned egr and checked idle control still no change

 

[dizzymae]

tactometer climbs from 1000-3000 in 10 secs,returns to 1000 slowly, after coming to a stop and putting transmission in park. now it feels like it maintains 2200 rpm most of the time and like the gas pedal is feeding the engine even when i am coming to a stop sign Mileage is 130,000 have changed temp sensor, cleaned egr and checked idle control still no change

 

[Bob Shuman]

You do not indicate the age of the vehicle. Look for a vacuum leak. The vacuum hoses can get old and brittle, crack and suck air raising the idle.

Bob

 

[dizzymae]

1996 SL2, thank you i will check that, is wd40 the best thing for finding vacuum leaks? you cant see or reach? Can you tell me vacuum hose route for the egr solenoid for the liear egr?
thanks for the help!