Question about 2004 Mitsubishi Endeavor
A week ago my engine suddenly started idling rough, feeling like it was going to stall. I had the check engine code read and was told it was the O2 sensor 1 bank 2. I replaced the faulty sensor and after a few miles it ran fine. a week later, after running good all week it started again. so I had the code read again and it gave me the same reading with random misfiring added to it. I checked and respliced the O2 sensor cable and reset the light. the light hasn't came back on but the engine is still idling really hard and when I start it I ,must press the accellerator all the way to the floor to get it to start. any suggestions would be wonderful.
Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300
Posted on Dec 15, 2008
The po301 is a misfire code. The backfire can be caused by a excessive amount of fuel, bad valve timing etc.
My guess is you have damage to an exhaust valve that may have occurred when you had the timing belt problem.A compression test will indicate if you have a leaking exhaust valve.The reason for the backfire is the exhaust valve is still partially open when the spark plug fires.
Posted on Jan 03, 2009
I have a ford 2003 windstar that was running very rough when cold and almost stalling. engine light came on. went to autozone and they read the codes for free and told me it was running lean on Bank 2 also. i came home searched for the O2 front sensors online using the info autozone gave me. there are 2 front sensors on my car that need to be replaced at the same time. look for ones that have a direct plug in and don't need wire splicing. the ones without the wiring harness are cheaper but more of a pain, i think.
they were fairly easy to replace. getting access with the wrench was the worst. reset the light by disconnecting the battery for a few minutes. seems fine now and the light hasn't come back on.
Posted on Jan 25, 2009
Posted on Feb 14, 2009
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