Floridaken

Im Not sure , If , U are talking about the Mas Air flow or the Air control valve, Is there such a thing?(air control valve)? I changed the mas air flow sensor between the air cleaner and throttle body.

Is your A/C not working? my a/c compressor kicks on and off sometimes and it will change the rpm's by cycling off. Try just turning your whole air system off and see what it does then. ← A/C is working fine , just changed compressor also, and had system off .. definitly a sensor of some kind, tps might be suspect also. Thanks again .

Sounds Simular to my symptoms, I will Try the air control valve cleanning. (not the mass air sensor) but the air control valve, it is two different things right? btw thank you..

Car type: lexus SC400 1993 Guys, I Just changed an altenator, and thermostat with o ring. after that install, I turn the car on , after it warms up in neutral the idel starts to set between 1000 rpm and 2000 rpm , it goes from low to high every 3 seconds. I dont understand, I took it to the shop , they said it was the mas air flow sensor and it would be $1100.00 retail from lexus, I picked one up off of ebay with the same numbers. put it on, and that is not the problem at all. Any suggestions would be greatly appriciated. chewin my nails waiting for an answer.