Hot answers tagged surging
Surging is when the engine revs change noticeably under constant load and constant throttle (which in theory should result in constant RPM). A very typical one is my Eagle Talon, that had a vacuum leak and at idle the revs would vary between 500 and 1500 rpm as the ECU was trying to control the idle, but didn't know about the additional air. Another typical ...
Do you a lift available? See if you can lift the vehicle just enough to clear the tires from the ground, and try to duplicate the problem. Check for any vacuum leaks, and also wiggle the ECCS wire harness and see if you can induce the problem.
This might be normal behavior. From the book Auto Fundamentals, pg. 146-147 in the section "Cold Start Aids": During cold startup on some systems, an auxiliary air regulator admits additional air into the intake manifold to increase the idle speed. The auxiliary air regulator is controlled by a thermostatic switch located in the engine water jacket. ...
I don't know when exactly Honda stopped programming this behavior into their cars, but I do know that what you described is a warm-up sequence that some older Hondas go through by design. First a high idle, then an alternating high and low idle (1-2 seconds/cycle), then normal low idle. I would say that the behavior you describe is normal, and not ...
I had a Chevy van do that same thing and after several pricey mechanics looked at it a "good ole local boy" mechanic found the issue. My main computer was mounted under my drivers seat and was loose. Going around corners, up hills, stopping ect.... Would break connection and cause surging that drove me crazy for months! He bolted it back down and fixed ...
Replace the camshaft position sensor. A bad sensor often makes it surge during idle and make it stutter on low revs. Has the car lost power? Is it difficult to start?
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