misfire

Asked by Mar 04, 2017 at 11:48 PM about the 2004 Dodge Ram 1500 SLT LB

Question type: Maintenance & Repair

Misfire on#4 & #6 cylinder. Replaced plugs, coils,
injectors, head gasket. Compression on both
cylinders is 155. Valves good, rockers good.
Replaced converter
COULD THE INTAKE BE CRACKED ON THE INSIDE?

1 Answer

74,645

I doubt the intake is cracked unless it is plastic. Possible causes; Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinders compression, Incorrect fuel pressure...Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. Use some carburetor spray along the intake gasket and spray anywhere there is vacuum to pick up a vacuum leak. You would notice it in the rpm's of the engine. Do this with the engine at idle.

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