Hp500 power loss
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Hp500 power loss
Running a hp500, jumps up out of the hole ok, runs up to 3800-4000 rpm then starts to sputter and back fire; increase throttle and goes no where.. New plugs and fuel filter, tightened fuel line fittings today. Going to check rail pressure in AM. I'm thinking fuel pump, thoughts??
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I agree valve springs 200 to 300 hrs max on these motors as they need to be changed, even if they are not broken they become weak. Pull your valve covers to check them closely to see if the are broken or some other related problem. Also compression test and or leak down test would be a good place to start., then a fuel pressure test. You could do more internal damage if any valve train parts are not up to snuff if you keep running the motor. I am ruling out a fuel delivery problem but need to rule out the valve train- related parts first as they can be a real problem child with your app.. I have so many pics of broken springs over the years from Hp 500 carb and the Hp 500 EFI engines.
Last edited by BUP; 07-18-2014 at 09:29 PM.
#8
If it is the original distributor, change out the electronic module inside the distributor. The old module was not sealed, the new one is sealed. Had this problem on the way to the pool party during TX Outlaw Challenge. You can tell by looking at the connections, if has wires connected to nuts, it is old.
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BTW they would leak internally and kill power..
Last edited by FIXX; 08-08-2014 at 01:02 AM.