Swap the ECM's from side to side,
see if the idle condition follows the
ECM

just a thoought.

jt

Good info guys....I will pass the info on/have him log on. The swap is a good idea !

Re: 500efi troubles
 

I have a pair if 1999 500hp's (carb). The alarms go off after a hard run, then quiet after a couple minutes at idle. Both engines do it. All gauges show normal, and drive bottles are full. I'm stumped! I unplugged the drive bottles....didn't help.

What now???

Help?

Re: 500efi troubles
 

If your gasket is missing on your outdrive res. cap, it'll throw the oil out at rpm (due to pressure). ie: if you have oil in the bilge... that's most likely your problem.

i'm not a mechanic, so hopefully my "non-techie" comments were understood.

Re: 500efi troubles
 

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire or connector.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.

Re: 500efi troubles
 

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire or connector.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.

Re: 500efi troubles
 

what are your volt meters showing at high rpm's? if dropping, or spiking, check your alt. connections. possibly a bad wire, connector, or best bet --alternator.

if not, unplut each of the three sensors to narrow the scope of your problem. i'd bet your senders or connection(s) to senders are bad.