Misfires on cold start

2002 SATURN L200
108,000 MILES • 4 CYL • AUTOMATIC
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MANDY9395
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  • 1 POST
Problem started a few months back. Car misfires when i start cold. Stops misfiring when warmed up completely. I have changed catalytic converter , fuel pump , fuel filter , ignition module, all spark plugs and all injectors. Check engine light on throwing code cylinder two misfire. But in the beginning threw code cylinder one misfire. i replaced the injector and spark plug for cylinder one. Ran good for two months, now says cylinder two misfire. The mechanics i have taken it to cannot figure it out so i am looking for online help.
Jun 8, 2017 at 4:34 PM
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STRAILER
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Hello,

A cold engine misfire many time is caused by the MAF sensor. When these sensors go out they may or may not trigger a check engine light,

Here is a guide to help you

https://www.2carpros.com/articles/how-to-replace-a-mass-air-flow-sensor-maf

Also it could be a vacuum leak, here is guide for that as well.

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run some tests and get back to us so we can continue helping you.

Cheers, Ken

Jun 12, 2017 at 1:44 PM
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