Popping sound
#11
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replace spark plugs but make sure you use AC delco from a current Mercruiser catalog. number has been superceded and there were alot of problems with the denso spark plugs. Im surprised you didnt store a misfire code in freeze frame though. Did you check freeze frame or only current Faults?
#13
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I did check store faults and there was none. hp500 I was thinking the same thing because when I checked the vacuum that it would pull it fell a little short of the spec.
#14
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if your fuel pressure is good WHILE EXPERIENCING THE POPPING (not just on the gauge idling), then look at ignition.
Yes, broken springs will cause popping too but a weak ignition will as well.
Yes, broken springs will cause popping too but a weak ignition will as well.