HELP

1988 Dodge Truck

Tiny

jrc02l

June, 11, 2009 AT 7:08 PM

Engine Performance problem
1988 Dodge Truck V8 Four Wheel Drive Automatic

I HAVE A ROUGH RUNNING 318 THROTTLE BODY INJECTION! I HAVE REPLACED PLUGS, WIRES, CAP, ROTOR, FILTERS, ALSO REPLACED FUEL PUMP THAT WAS IN THE TANK! ANYONE HAVE ANY IDEAS? MOTOR MOUNTS ARE INTACT AS WELL!

1 Answer

Tiny

caradiodoc

June, 16, 2009 AT 4:08 PM

Worn distributor bushing, vacuum leak, worn camshaft lobe, sloppy timing chain, burned valve.

Burned valve will sound like an air compressor, and can be found with a cylinder leakage test.

Vacuum leak can be found by spraying water around the intake manifold gaskets.

Worn timing chain can be verified by removing the mechanical fuel pump block-off plate and pushing on the chain with a piece of coat hanger wire.

Worn distributor bushing can be verified by watching timing marks with a timing light. Timing will be erratic and marks will be bouncing all over.

Worn cam lobe / weak cylinder can be found with a cylinder power balance test.

Caradiodoc

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