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Re: bad firing on Super M
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Posted by Bob M on October 17, 2002 at 06:25:04 from (165.170.128.66):
In Reply to: bad firing on Super M posted by Hayne D. Matthews on October 17, 2002 at 04:29:49:
Hayne - I can think of several possibilities. Starting with the easiest stuff: 1 - Bad spark plug. Try swapping the #3 and #4 plugs. If #4 now misses at idle, suggest replacing all the plugs. 2 - Bad plug wire (do same as above only swap the plug wires....) 3 - Manifold leak at the head. With the motor idling spray WD-40 liberally around the perimeter of the #3-4 intake manifold flange. If #3 starts hitting when spraying the WD-40, you've got a vacuum leak. Remove the manifold and replace both gaskets. 4 - Sticking, poorly adjusted or burned valve on #3 cylinder. Do a compression test on all (4) cylinders. If compression on #3 is significantly lower than the others (10% or more), remove the rocker cover and check/adjust valve clearances. If clearances are OK, you're probably looking at a valve job. Good luck!
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