Question about Saturn SL1

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Random multiple misfirings

My Saturn 2004 Ion was working great until we had a severe freeze, below 17F. Then the car started running rough, no power, really chugging. Check Engine lite flashing. Drove it about 2 miles to Autozone, they put the meter thing on it, comes back 'random multple misfirings,' Autozone guy thinks it just needs a tuneup. Could that just be it?

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  • ddonovan12 Mar 10, 2009

    2001 Nissan Altima running smooth then all of sudden started running real rough at traffic lights and while in "drive" idling. Failed emission check for renewal of registration and the code read 'random multiple misfiring."

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Here is a list of possible causes. You should not drive the vehicle if the check engine light is flashing all the time, you can cause even more damage. It could pay to have a professional find the real cause.

Spark plugs that are incorrect for the application, cracked, improperly gaped or worn can cause the engine to misfire or run rough at all times.
An IC module that failed to correctly control the ignition coil(s) will cause the engine to misfire or run rough at all times.
Poor connections, broken wiring or wiring that has shorts to ground can cause the engine to misfire or run rough at all times. NOTE: Check connectors that might be pulled apart as the engine flexes or wires that short to ground as they pass near brackets or shorts to ground on the exhaust manifold.
Fuel injector(s) that are shorted, plugged or partially restricted can cause the engine to misfire or run rough at all times.
An ignition coil(s) that has low output, corrosion on the coil tower(s), is carbon tracked or arcs to ground will cause the engine to misfire or run rough at all times.
A PCM that failed to properly control the injector or ignition timing will cause the engine to misfire or run rough at all times.

Posted on Feb 02, 2009

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