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Missfire cylinder 8 545

Missfired on all cylinders i have changed the sparkplugs after that only missfire on cylinder 8

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Move the ignition coil to another cylinder and see if the problem moves. If it does it is the ignition coil replace it otherwise it is probably the fuel injector.

Posted on Jan 18, 2013

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1 Answer

Missfire on cylinder 8 on bmw 545


move the ignition coil to another cylinder and see if the miss fire moves. If so replace that ignition coil. If the miss fire stays on that cylinder it is more likely the fuel injector. Was their carbon on the spark plugs when you removed them? This is indicative that the fuel injector is gummed up.

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My 1999 suburban is missfiring on cylinder one, changed new plug, cap & rotor, wires


You seem to have covered almost everything electrical. That leaves mechanical. Either valves sticking, frozen, or spring, cam broken. Fuel line or injector to that cylinder is the only other item I can think of. Let me know how it works for you.

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I would repalce the fuel filter, air filter and the sparkplugs. Check the boots at the plugs for holes burned through by the spark plug high voltage. It would be helpful to know the mileage of this vehicle.

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