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change the 3rd ignition coil clear codes and see if any come back ,if in dout exchange #3 coil with 1 other if your misfire code switches to other cylinder that's a bad coil auto zone has them 65.00
wiring faults to coil/s --coil/s --HT leads ---Spark plugs --low fuel pressure --injector wiring--injectors -- faulty injector tips are some of the causes for misfiring. Run the fault codes to check where the fault may lie.
it could be your exhaust sensor. If it is not sending the right information to the computer than the computer will adjust the tuning to suit.I hope this helpsregards
You didnt mention whether or not you cleared the codes. Typically you can clear the ECU codes by disconnecting the battery for a few mins and putting it back on. Otherwise you need to use a code reader to clear the codes. The code will not just fix itself once the problem is resolved. You need to clear the codes and then see if the check engine light/code comes back.
On a side, note the misfire can be caused by a few different things. However first reset the codes and see what happens
can you tell which cylinder is affected? If a spark plug gap is to wide, the coil may have trouble creating a hot enough spark to jump it. Check your plugs for proper gaps befor looking to the coil. Good Luck _Ned_
misfire happens because there is still fuel not burned in the cylinder so when its pushed out its burned in exhaust tube because the heat thats why you hear these small explosions. this caused if your sparking pluge not firing well . or there is a leak in the intake valve . in your case i advice you to check your sparking plug .
if this helped pls vooote
This is a pretty common problem. I would change your valve cover gaskets. They run around ~ 50 bucks. If they are bad it will leak oil into spark plug well and cause a misfire. Very known on the 740.. Also if tune was not anytime not too long ago id change spark plugs while you at it. Then clear the computer and if you still get misfire on 8 try changing the ignition coil which is right about the cylinder with cylinder ignition coil 5. clear the computer. if you get random misfire and misfire cyclinder 5 after then its your ignition coil. parts store runs around 100 bucks
Spark plug wires may be the cause. for cold damp start issues water is a conducter and will send spark directly to an engine ground not through spark plugs. also look for oil in spark plug wells this can also cause a misfire under certain conditions.
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