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Originally Posted by bripar77
(Post 4190262)
If the engine still revs ok not under load (in neutral) good chance you have a vacuum leak from probably a hose that came off somewhere. Check for vacuum small hoses that
that would change the timing. Sounds like what happen to me once. Even had my mechanic in the boat and he could not figure it out. A friend found it. Small 1/8 vacuum line under the whipple charger in the manifold. It was effecting the timing through the ECU. It would rev up fine in neutral but once we tried to get on plane it would lay down. Not 525's but sounds the same |
Bripar77 may be on the right track. Backfire may have blown hose off fuel regulator. Hopefully nothing internal. Good Luck!!!
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Have a scan done. On our 525s once in awhile starboard would make a metallic tap sound while getting on plane only. Sounded like it was in the exhaust header. The tap would only make the noise one or 2 times when getting on plane, otherwise engine performed fine. Turned out it was a bad cam sensor.
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I had the same problem once, it was that the mechanic's fault by putting the number 5 plug lead into the 7 and vice versa. Idle was fine, no power and it did backfire.
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Originally Posted by D Harry
(Post 4190347)
I had the same problem once, it was that the mechanic's fault by putting the number 5 plug lead into the 7 and vice versa. Idle was fine, no power and it did backfire.
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Believe me it did idle fine, and that was one of the reasons I took quite a while to solve the problem. but it use to backfire also on idle
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I had a 500 EFI that had the same simptons .turned out it was the coil pickup that is under the distributor cap.You have to pull the dist.and knock the pin out of the gear and slide the shaft out to get to it.I to replaced everything else till someone mentioned it here on OSO.Just a thought
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525 doesn't use a distributor like a 500, they have a cam sensor.
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Originally Posted by lil red
(Post 4190359)
525 doesn't use a distributor like a 500, they have a cam sensor.
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Yes sir, bring a fuel pressure gauge when you go to do the compression test
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