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1976 Cadillac El Dorado Repair Question


Topics covered: Distributor, Engine, Distributor cap.
Mileage: 120,000 miles.

Asked on October 10, 2011

How do I trouble shoot an engine skip in a 1976 cadillac eldorado 500

I replaced the timing chain and gears also the water pump. the car had the skip before this and still after. I also replaced the plugs, wires and rotor. It skips when the engine is cold or hot. Under the rocker covers was a lot of carbon particles which I cleaned out. Could a valve be sticking? the engine is a 500 with a 4 barrel carb. thanks for any advice.
Avatar Asked by Earle

Answer

Replied on October 10, 2011

Did you replace the distributor cap and rotor? If not, did you inspect the cap for cracks?

Tiny Answered by Jacobandnickolas (expert)
57,318 answers provided
Replied on October 11, 2011

I did replace the rotor and inspected the cap. I also checked for spark and continuity. I had thought it was a timing problem which is why i replaced the chain and gears. when piston 1 is tdc the timing mark lines up with the 0 on the scale but the rotor seems to be in the wrong place. when I put the timing light on it the mark is still at 0 but is supposed to be 6 degrees advanced. is it possible I skipped a tooth when I reinstalled the distributor or timing gear and chain? adjusting the distributor helps some but it still runs rough. Thanks

Tiny Response from Earle
1 question asked
Replied on October 11, 2011

It sounds like you are a tooth off on the distributor. Line up the timing marks to TDC and the rotor should be pointing at the #1 plug wire on the distributor. It's really easy to be off one tooth.

Tiny Answered by Jacobandnickolas (expert)
57,318 answers provided

Replied on October 11, 2011

Thank you.

Tiny Response from Earle
1 question asked
Replied on October 12, 2011

Let me know what you find.

Tiny Answered by Jacobandnickolas (expert)
57,318 answers provided