500 EFI losing rpm's
#1
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I had the port engine rebuilt over the winter. It's a 500 efi, and when I take it up over 4000 rpms it will top out at 4500-4600 then start losing rpms. I can back it down below 4000 for a few seconds then take it back up and it does it again. I have changed the fuel water seperator filters. Just looking for suggestions where to go next. I will probably hook a fuel; pressure gauge up next to see what pressure I get.
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Originally Posted by ExcaliburHawk40
Check fuel pressure. That is most likely the problem. Be careful, if it is pulling RPM it is because it is detonating!!
#5
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Also is the other motor only going to 4600? if so you need to buz it higher after you find the problem.Its Proped wrong.
Rob
Rob
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#7
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Originally Posted by Steel Outlawed
Last year they would run up to 5000+. So it's something that has happened since the rebuild.
Is all the fuel system stock 500efi stuff???
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#8
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I had the same problem last year with a 525efi.
There is a sensor assy on the crankshaft pulley mine was part #828358 2.
I would run wide open then it felt like I was rumming out of gas. I'd slow down for a while then it would be ok. It happened twice on poker runs.
Changed the sensors and never had the problem again
Steve
There is a sensor assy on the crankshaft pulley mine was part #828358 2.
I would run wide open then it felt like I was rumming out of gas. I'd slow down for a while then it would be ok. It happened twice on poker runs.
Changed the sensors and never had the problem again
Steve
#10
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Originally Posted by lucky strike
I had the same problem last year with a 525efi.
There is a sensor assy on the crankshaft pulley mine was part #828358 2.
I would run wide open then it felt like I was rumming out of gas. I'd slow down for a while then it would be ok. It happened twice on poker runs.
Changed the sensors and never had the problem again
Steve
There is a sensor assy on the crankshaft pulley mine was part #828358 2.
I would run wide open then it felt like I was rumming out of gas. I'd slow down for a while then it would be ok. It happened twice on poker runs.
Changed the sensors and never had the problem again
Steve
__________________
.
The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
.
The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.