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Could be alot of things. Bondo asked ya for a picture of the spark plugs 3 months ago. I haven't seen them yet. We can't help you if you don't help us.
Re: 1987 Merc 350 noise at high RPM, timing related
I can't for the life of me get the camera to focus correctly on the plugs, so it's always a big blur. But they're all tan & look good.
Agreed on the guessing part...there has to be a better way. I have a mechanic's stethoscope (which is great), but listening to the engine while in gear & at rpm (and speed) just isn't going to happen. And no dyno
