1997 Lexus ES 300 "rpm rise fall" Questions

rpm rises and falls at idle, while driving car jerks very bad have to press gas or rpm falls and car dies replaced throttle position sensor and map sensor but still turns off might be iac sensor i ...

the fuel pressure rises when it fall on its face. the car never dies just falls then picks back up and will fall again unless you keep it under the that rpm. then it is fine. what could be the problem

...2 with throttle motor rpm rise and fall at idle. thanks hi fix it by change the throttle motor because it was have the problem check the result and ask us for more information with my best ...

...help with that. Also check the connection at the sender. Can also be the sender itself going bad. Pressure will normally rise and fall with engine rpm but should remain steady if rpms do not

Engine problem idle speed rpm rises and falls from 2500-2000 in park, but is at 1500rpm when in drive. Hi goodafternoon, I think the problem is your thermostat is bad, because I had similar issue that

what is that valve that's on the left side of the throttle body called? could that valve make my rpm's rise and fall while in neutral if it's bad? Yes. It's called the idle air control motor. IAC

RPM CONTINUES TO RISE AND WILL NOT FALL BELOW 2. Check throttle cable for fraying /binding. Check for vacuum leaks, check tps and any idle control motors fro proper operation, check throttle plate for

...rpm seems to rise and fall when at idle and when driving it ran a little roughly. i adjusted the idle mixture screw and it improved a lot but still seems to be surging mildly as well as it now has a ...

engine of my 03 plate megane it seems to happen during acceleration and rises and falls up with the rpm and also happens when the car is parked does it sound like a jet engine when increasing the rpms

...the throttle body idle lever can wear out causing cars rpm to drop-chec gauge to confirm-wil be around 500------also motor mounts wear-need to test using emergency brake and watchn engine rise n ...