Quote:
Originally Posted by Lizzie01
Can't determine cause of misfire and loss of power in #4 cylinder. Idles ok, but misses when revved. Plug coated with carbon. Swapped plugs, same result after 70 miles. Pulled head and #4 black crusted. Valves "look" ok. What could be my problem? Would appreciate some guidance while I have the head off.
Thanks!
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Things that should have been done first prior to head pulling:::
Ck to make sure its not an ignition or spark issue.//in line spark tester to #4 plug
A vacuum leak from the intake gasket /// smoke test motor or for the novice use propane or carb cleaner to test
Perform a leak down test
All this is assuming your #4 cylinder is not dropping out the correct percentage when grounding out the spark