95 vette Moster headache
Thread Starter
3rd Gear
Joined: Oct 2023
Posts: 3
Likes: 0
95 vette Moster headache
alright where to start on this thing so car was bought with a blown engine completely locked up so we an engine out of the same year caprice slapped that nightmare in then found out hey we have a wiring harness problem with rodents so long story short this thing is a major pain in the butt. fixed the wires that i found chewed up to the fuel pump and a few others too and bypassed the security with a couple resistors. so now the car starts up and runs but only runs for at most is 10 seconds then cuts out almost seems like its cutting the fuel signal but i could be wrong. you would think "hey lets get a code out of it well either the ecu doesnt have any codes or i have a wiring problem there aswell then thats when i noticed that the check engine light isnt illuminating with the rest of the lights. currently trying to check the wiring for the communication for the ecu but it has me scratching my head alil bit as far as the information center where the codes display
so my question is HELP lol im not sure if im chasing my tail or havent discovered the problem yet
so my question is HELP lol im not sure if im chasing my tail or havent discovered the problem yet
Last edited by fckitfixit; Oct 9, 2023 at 07:35 PM.
Thread Starter
3rd Gear
Joined: Oct 2023
Posts: 3
Likes: 0
yes and no there are differences that ive noticed like the direction of the spark plug is straight instead of on an angle so you need different exhaust manifolds and the opti distributor was different but internals of the disi was the same
Melting Slicks
Joined: Feb 2003
Posts: 2,676
Likes: 810
From: Saskatoon Sask.
alright where to start on this thing so car was bought with a blown engine completely locked up so we an engine out of the same year caprice slapped that nightmare in then found out hey we have a wiring harness problem with rodents so long story short this thing is a major pain in the butt. fixed the wires that i found chewed up to the fuel pump and a few others too and bypassed the security with a couple resistors. so now the car starts up and runs but only runs for at most is 10 seconds then cuts out almost seems like its cutting the fuel signal but i could be wrong. you would think "hey lets get a code out of it well either the ecu doesnt have any codes or i have a wiring problem there aswell then thats when i noticed that the check engine light isnt illuminating with the rest of the lights. currently trying to check the wiring for the communication for the ecu but it has me scratching my head alil bit as far as the information center where the codes display
so my question is HELP lol im not sure if im chasing my tail or havent discovered the problem yet
so my question is HELP lol im not sure if im chasing my tail or havent discovered the problem yet
Dude, maybe you should consider using some periods and capital letters.(in other words, proper sentence structure). More people willing to help you out if they don't have to struggle to make sense of your post.
Drifting
Joined: Aug 2009
Posts: 1,971
Likes: 243
Get a fuel pressure gauge on the rail. That will confirm for you at least if your prob is fuel. Sounds like it might be doing the initial key-on prime, but not continuing to run the pump thereafter.
hate to say, but that may be wiring related as well.
hate to say, but that may be wiring related as well.
Pro
Joined: Mar 2007
Posts: 595
Likes: 355
From: Mt Prospect IL
2025 C4 of the Year Finalist - Unmodified
I would agree with jmgtp. Sounds like the oil pressure switch is not keeping the fuel pump energized. Wires on the back center of the motor?
Last edited by jmeyer58; Oct 10, 2023 at 07:54 AM. Reason: Typo
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Thread Starter
3rd Gear
Joined: Oct 2023
Posts: 3
Likes: 0
i thought the same thing with fuel pressure cuz it almost seems like security or bleeding off the fuel i jumped the fuel pump relay same thing and tricked the security and same thing. i thought maybe the computer but everything was swapped over from the old motor all i had was a bare block intake plenum sensors ect ect. if we spray it with brake clean it will stay running as long as we are spraying so definitely seems fuel related just cant seem to figure out whats cutting the injectors
Drifting
Joined: Aug 2009
Posts: 1,971
Likes: 243
No new info to make any other guess, I still lean toward pump issue, whether it is the pump itself, relay, OP switch or elsewhere. Putting a fuel pressure gauge on it still gives you valuable info - if it still has running pressure when it quits then you know it’s not fuel related from tank up to the rail. Could then be injectors not cycling. Once fuel ruled out, I’d be looking at Opti and ICM next.