502 mag mpi cutting out
09-01-2023, 12:06 AM
#31
Charter Member # 55
Charter Member
I did buy a new cap, rotor and ignition module for mine to be safe, gojng to run the boat this weekend.
I hooked up a scanner for codes, nothing. I also ran a fuel pump test with the scanner with a fuel pressure gauge on the rail, 48-49 psi while the pump was cycling, held about 44-45 when it was turned off.
I hooked up a scanner for codes, nothing. I also ran a fuel pump test with the scanner with a fuel pressure gauge on the rail, 48-49 psi while the pump was cycling, held about 44-45 when it was turned off.
BTW, changed my EST module today and no change for how mine runs.
Last edited by Griff; 09-01-2023 at 12:15 AM.
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SB (09-01-2023)
09-01-2023, 04:29 AM
#32
yea I just checked to see if it were obvious. Planning on taking scanner and gauge with this weekend.
Last edited by Bstocky; 09-01-2023 at 05:16 AM.
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Griff (09-04-2023)
09-01-2023, 05:20 AM
#33
09-01-2023, 06:56 AM
#34
Registered
09-01-2023, 07:16 AM
#35
Registered
It's called a antisiphon valve. Stops fuel from siphoning into bilge if there is a leak between tank and filter
09-01-2023, 04:12 PM
#36
09-02-2023, 12:00 PM
#37
I put in a new ac delco pick up coil this AM, just to be safe, one I pulled out smelled a little burnt actually. Had the boat running warming up just to check timing, had the scanner on it just watching everything. Every time I refire the boat I get a code 23 manifold air temp malfunction(which is a new sensor) and code 14 coolant temp malfunction. When I watching those numbers on the scanner both are pretty accurate, I shot the hose with my laser temp gun and was with in a few degrees of the scanner coolant temp, and the air temp seemed about right at 78° and rose to low 80’s after 30 mins of idling. I unplugged both on the air temp went to 0 and back to it previous reading when plugged back in and coolant went to -39 when in plugged and back to 165 when plugged back in. Pins look good in the plugs, I removed the ecm harness connections don’t see any signs of corrosion or damage. Don’t think those plugs could have been swapped under the plenum when I did the injectors? I have the gray harness plug on the air temp and and the black harness plug on coolant. Sound right?
09-02-2023, 01:03 PM
#38
Platinum Member
Platinum Member
Did you use the white grease under the pickup ?
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sutphen 30 (09-02-2023)
09-02-2023, 03:58 PM
#40
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