502EFI Internal noise diagnosis...Listen
#11
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Thanks for the replies!! Sorry, meant to update more information sooner.....
Motor started making this noise one day getting up on plane leaving the harbor.....
At the time of the video, which was last Friday. We had already broke the entire motor down (because we thought it was spun bearings), checked everything internal and all looked good except a bent push rod. Replaced that and reassembled with all new gaskets and plugs, etc etc.....Put the motor back in and the noise is still there......
Replaced the #6 spark plug wire, noise still there......
Swapped injectors, noise still there.....
No lack of power either......hope this helps
Thanks again for the ideas, hope one of them is it!
Motor started making this noise one day getting up on plane leaving the harbor.....
At the time of the video, which was last Friday. We had already broke the entire motor down (because we thought it was spun bearings), checked everything internal and all looked good except a bent push rod. Replaced that and reassembled with all new gaskets and plugs, etc etc.....Put the motor back in and the noise is still there......
Replaced the #6 spark plug wire, noise still there......
Swapped injectors, noise still there.....
No lack of power either......hope this helps
Thanks again for the ideas, hope one of them is it!
#14
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After listening again, I don't think the noise is consistent enough to be an exhaust leak. Valve train problems generally have a more consistent noise also.
I had a very similar noise on an SC'd SBC in a street rod. It ended up that the clearance was too tight on a wrist pin. There was no metal in the oil and no obvious damage until the wrist pin was removed.
I had a very similar noise on an SC'd SBC in a street rod. It ended up that the clearance was too tight on a wrist pin. There was no metal in the oil and no obvious damage until the wrist pin was removed.
Last edited by Griff; 08-14-2012 at 01:14 AM.
#15
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fixx
Thanks for the replies!! Sorry, meant to update more information sooner.....
Motor started making this noise one day getting up on plane leaving the harbor.....
At the time of the video, which was last Friday. We had already broke the entire motor down (because we thought it was spun bearings), checked everything internal and all looked good except a bent push rod. Replaced that and reassembled with all new gaskets and plugs, etc etc.....Put the motor back in and the noise is still there......
Replaced the #6 spark plug wire, noise still there......
Swapped injectors, noise still there.....
No lack of power either......hope this helps
Thanks again for the ideas, hope one of them is it!
Motor started making this noise one day getting up on plane leaving the harbor.....
At the time of the video, which was last Friday. We had already broke the entire motor down (because we thought it was spun bearings), checked everything internal and all looked good except a bent push rod. Replaced that and reassembled with all new gaskets and plugs, etc etc.....Put the motor back in and the noise is still there......
Replaced the #6 spark plug wire, noise still there......
Swapped injectors, noise still there.....
No lack of power either......hope this helps
Thanks again for the ideas, hope one of them is it!
i remember on the gm trucks they had a distributor problem and would make a banging noise when the bushings wore out ..
#17
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thinking about basics,by removing plug wire while running, loading change is to wrist pin and rod bearing. also eliminates some exhaust pressure on that cycl. result from these changes.exhaust flapper,wrist pin,rod bearing. check and let us know,good luck
#20
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Sounds to me your exhaust valve is not opening all the way, and it is backfiring through the intake.
You mentioned a bent push rod, was it an exhaust valve rod? Chance that you siezed a valve and wiped a lobe off the cam?
Take the valve cover off and watch the rockers at idle.
You mentioned a bent push rod, was it an exhaust valve rod? Chance that you siezed a valve and wiped a lobe off the cam?
Take the valve cover off and watch the rockers at idle.