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Misfire in #4 changed plug wires and both ignition coils still runs rough

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It can still be fuel injectors dirty or partially plugged,and injectors also can deteriorate electrically,fuel supply,check with a gauge at the rail.Have also seen catalytic convertors stop up in the exhaust system,causing misifires and misfire codes,and also on a specific Mitsubishi truck,the powertrain control module,aka vehicle computer was bad,causing a misfire specifically on one cylinder.Then there are the mechanical causes that can be eliminated by performing a compression test for piston rings and valves,and a leakdown test that more specifically tests the intake and exhaust valve's sealing ability.Have also seen a bent rod on a running Ford engine cause a misfire,but that showed up on the compression test as that cylinder's compression was much lower than the other 5.

Posted on Aug 29, 2008

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Got a problem with a misfire on 4 put all new plugs & a new oil changed engine light blinking in and our car running rough when I stopped car smelled burning and smoke near back tires


I really couldn't tell you without checking it out. But I would check the coil pack or dist.Cap or ignition control module and change the sparkplug wires.

It's probably the Sparkplug wires or one of the coils, depending what your car has.

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First the DTC P0304 is a misfire on number 4 cylinder which would be a sparkplug,plug wire,coil or a fuel injector and sense you've replaced three out of the four I would think you have a clogged or faulty injector.As for the DTC P0300 that is a random misfire detected which could co-inside with the bad injector.If it were me I would replace the injector and go from there and see if that fixes the problem.

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Reduced power light/check engine runs very rough 2005 ion


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Misfire in cylinder 1 2001 mercury sable


Next change swap the injector with another and see of the problem moves.  If it does it's a bad injector.  

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Random multiple misfirings


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.

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2 Answers

Engine misfires


You didnt mention having changed the spark plug wires, so that is another item that could be culprit as well. As well, it could be a coil pack that is not working properly.

I cannot recall at the moment if that model year uses coil on plugs or if it uses coil packs. Either way, if it uses a coil on plug set up, take the one for the #3 cylinder and move it to say #4 or anyone of your choice and see if the misfire follows

If it uses coil packs, there is likely one coil pack that controls two cylinders. In that case just swap the coil pack with an adjacent one and see if the problem follows. Pay attention to where the spark plug wires go because it will be an issue if you get them mixed up. You just swap the coil packs around.

I would, however, start with the spark plug wires if you have not changed them already.

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