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8 CYLINDER RUNNING ON 6

hawkmiller

New member
5.7 MERCRUISER MISSES & R

5.7 MERCRUISER MISSES & RUNS ROUGH. Checked the plugs & changed the wires no difference. When I pull the spark wire from two of the cylinders there is no change in the engine idle or sound .There is plenty of spark.My friend suggested a compression check? Any help much appreciated
 
Listen to your friend; perform

Listen to your friend; perform the comp. test on a warm engine and the throttle held wide open. Test once dry then wet w/a squirt of engine oil. Let us know the comp. numbers. Which two cylinders?
 
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