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Rpm won't go above 2500. - 2005 Mercury Montego

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HI there. This state is called limp mode. When the engine computer senses a serious issue within the operating status of your engine, it will initiate this safety mode, which in return, causes your vehicle to not exceed a certain mark. This state is to prevent further damage to the engine. There may be excessive back pressure, due to a failed comb inside the catalytic converter, or there may be some sort of sensor malfunction, as well. In any Case, you will need to have the ECU(engine computer) scanned for trouble codes. Once the codes are pulled, you will be able to isolate the actual culprit for repair.

I suspect a failed injector of a malfunctioning ignition coil. Auto zone will run the scan for free. Kindly return with the codes for further repair info, if needed.

Posted on Jun 02, 2010

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