Question about 2001 Toyota Celica
When I am stopped the RPM's surges up and down. When it is cold and the engine is first started the idle RPM will go up and down from 1000 to 1500 and back. Once the engine is warm it surges between 700 and 900 RPM. I only see this when I am stopped. There is no surging that I can notice while I am driving.
The check engine light just came on and the code indicates O2 sensors. I have ordered new Denso O2 sensors, both the upstream and the downstream. I do not think that is related to the RPM problem. But, I could be wrong. My guess is the Mass Air Flow sensor needs to be cleaned. Am I correct in my guess? Or, is there something else that needs to be done
Certainly sounds like the o2 sensors have become contaminated and are not acting as fast as they used to , or are supposed to.
Posted on May 04, 2009
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Posted on Jan 02, 2017
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