500 EFI losing rpm's
04-24-2006, 09:15 AM
#1
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500 EFI losing rpm's
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.
04-24-2006, 08:21 PM
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Re: 500 EFI losing rpm's
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!!
04-25-2006, 06:03 PM
#5
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Re: 500 EFI losing rpm's
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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04-25-2006, 10:46 PM
#7
Re: 500 EFI losing rpm's
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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04-26-2006, 10:44 AM
#8
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Re: 500 EFI losing rpm's
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
04-26-2006, 10:46 AM
#9
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Re: 500 EFI losing rpm's
Originally Posted by chad1
Have You Changed The Silver Filter At The Top Rear Of The Motor?
04-26-2006, 12:31 PM
#10
Re: 500 EFI losing rpm's
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
__________________
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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.
