Question about 2004 Mitsubishi Endeavor

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Rough Idle and hesitation on acceleration

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.

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  • alicia121 Mar 31, 2009

    i have the same problem, but car was working fine and then i had an oil change and now it is running rough and rpmsjump when i start the car

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6 Suggested Answers

  • 184 Answers

SOURCE: Random engine misfiring- fault code P0300- 1999 cutlass

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

  • 4 Answers

SOURCE: 98Eclipse 2.0 nonTurbo 5speed 180,000 miles ,code PO301

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

  • 1 Answer

SOURCE: location of O2 sensor in bank 2, 99 5.4 expedition, running lean

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

  • 132 Answers

SOURCE: IAC VAlve on 2001 Mitusbishi Mirage DE 2 door 145,000

I would try to clean the IAC with a little CHEMTOOL and see if that helps first.

Posted on Feb 07, 2009

roedmondson
  • 68 Answers

SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced

  1. P0171: This means that the oxygen sensor has detected a lean air-fuel ratio. This can be caused due to a vaccuum leak or a problem in the HO2S circuit or the HO2S (Heated Oxygen Sensor) itself. (Bank one Sensor one). This is commonly located along the exhaust pipe. It could also be a bad Mass Air Flow sensor or a bad Engine Coolant Temperature sensor. Diagnostic checks will be needed to be carried out to be verified though
  2. Well as for the other codes, it means #3&4 cylinders are misfiring. It is a possibility that the P0171 code mite have caused the others to show up. I can be wrong though. But it is a strong possibility. If the air fuel mixtue is too lean indeed, mis-firing will occur, unless it is an actual electronic and not a mechnical problem. By the way, when these codes appear, how is the engine's performance. Does it remain the same or behaves poorly?

Posted on Feb 14, 2009

  • 107 Answers

SOURCE: the computer says Random / muliple cylinder misfire detected

look for a vacuum leak

Posted on Feb 27, 2009

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