Question about 2001 Toyota Corolla
My corolla will rattle upon deceleration and when hooked-up to the engine code reader while running, the fuel system 1 goes back and forth between closed and open. I also have a lot of other data points like IAT 97 degrees (which) has a down arrow by it, but when it is 82 degrees it has an up arrow by it(Actron model autoscanner), Long Term Fuel Trim 1 has a down arrow by the 18% given, the catalyst Mon and Evap system Mon are flashing in the code reader, as well. So much stuff and don't know where to start. I have cleaned the MAF and added fuel treatment to clean injectors, etc. Any suggestions are appreciated. The codes previously thrown are multiple misfires in the 4th cylinder (P0300 and P0304) and Catalyst system below threshold (P0420)
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Posted on Jan 02, 2017
What is the mileage on that car? If the MAF sensor would be acting up, you get tip in acceleration hesitation, it sounds like the Air bypass valve is having issues. Replace it. Do not clean it just replace it.
Posted on Aug 29, 2011
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