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Mifire code on cylinder 5 have changed plugs and still comes up

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Either a coil ,wire, fuel injector. if you have wires check for white spots for arcing out on ground.

Posted on Jul 13, 2010

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HOW TO REPAIR A po307 engine code on a 2007 chevy silverado


the code p0307 is a misfire code on cylinder number 7 which is the 3rd cylinder on the driver side need to check spark plug and plug wire for that cylinder as it can be anything from a sticking valve to a vacuum leak what i do to check this is remove number 5 cylinder plug and wire and install them on cylinder number 7 and put plug and wire from 7 on 5 and clear codes and drive till light comes on and see if it comes up with same code if it does you will need to check for a vacuum leak or a valve problem with cylinder 7 if it comes up with a p0305 then change the plug and wire

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2002 honda accord se has a mifire at 4000 to 6000 rpms check engine light starts flashing and then stops and goes away


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First the po 171 is that bank 1 is running lean, as far as the codes po104-106, i think you made a mistake, the mifire codes for cylinders 4-6 would be po304, po305 and po306. the fiurst thing to check would the fuel preasure.

The reason i say fuel pressure is due to the misfiring and lean codes.
If the fuel pressure tests okay then check for intake manifold gasket leak, this is done with a smoke machine or with some throtle body cleaner spray. you will neeed to start the engine and spary around the intake gasket area as you watch for engine speed change.
A scan tool may be needed to watch fuel trim and o2 readings if the intake leak is small.
The other problem could be sparkplug failure or bad coil and last sparkplug wires if this is not a coil on plug system.
Acoil on plug system would be a system with out sparkplug wires going to each sparkplug, instead there is a separte coil on each sparkplug.
If this is a coil on plug ignition system i would start there and swap coils with the other cylinders and see if the misfire moves to those cylinder if it does then bad coils. hope this is helpful , good day

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Have you run a compression test of the engine? Have you confirmed you have spark at #3? Is #3 no more than 5% lower than the highest cylinder reading in PSI? ALWAYS run the basic tests before throwing parts at the problem. Also does the injector "pulse" and deliver fuel? When you pull the #3 Spark plug out after cranking the engine does it smell like gas?

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I have a mifire on cylinder 5 how can i fix it


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Engine light comes on. Code is PO305 #5 cyl mis fire.


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