Question about 2004 Chevrolet Malibu

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2.2 ecoteck 2004 malibu 4cyl. runs rough. diag. random misfire. changed plug,coil and boots. no change.

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Have you checked you ignition module? Typically, this is the main problem on these cars. If it's fine, then the CKP or CMP sensors are probably faulty. Check the refernce signal to both sensors (Crank Sensor and Cam Sensor) and if you find they both have good signal, have them checked with a schematic and flow chart to see if they are faulty. Next major cause and common as well, is the injectors not closing correctly, however, this typically leaves a lean or rich condition and not just a random misfire.

Hope that helps.

Kevin

Posted on Sep 12, 2009

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Posted on Jan 02, 2017

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https://www.google.ca/url?sa=t&rct=j&q=&esrc=s&source=web&cd=9&cad=rja&uact=8&ved=0ahUKEwj3i8uU-YbLAhVImx4KHaOhDcoQFghMMAg&url=http%3A%2F%2Fricksfreeautorepairadvice.com%2Ftag%2Fp0300%2F&usg=AFQjCNEEy9v40AO2Se1VIp-iekkFnE_E2g

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I took my car to have the codes ran. It comes up with a random misfire code. I have changed the MAP sensor, fuel pressure regulator, fuel filter, complete exhaust, spark plugs, boots, coils, and had the...


Car running rough and misfire has various reasons, as you have tried most of them except the EGR valve , Check it out.

The symptoms show you have an faulty EGR valve . Replacing it will cost you around $50.

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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.

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