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2005 crown vic I put a cold air filter on and now the check engine light is on and it runs rough.

Car runs rough now

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That is because you no longer have the air flow the MAF
Sensor & the PCM were written or programmed for by Ford.

Did you check to see what codes you have,may be unrelated,
if you had the key on at some point & connectors off

Posted on Mar 29, 2014

Testimonial: "I left the sensor on and cut the stock filter box off and put the filter in front of the sensor"

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'99 Ford Crown Vic LX: #12 30A Maxi fuse blows seconds after starting or ignition turned on.


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When you turn the key on does the check engine light come on? If not it may be burned out. It sounds like a MAP sensor or an O2 sensor is bad. I would suggest taking it to autozone as they do free diagnostic and seeing if a code comes up. If it is a sensor it should, if not it may be the idle sensor not reading right in the ECU. More than likely it is one of the sensors though.

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