I ordered a rebuilt ecm from ecklers and installed it today. The vette started but would not stay running. tried 3 times but each time it sputtered and backfired thru the throttle body. will not idle or stay running. Ordered new fuel pressure relay from ecklers and is on it way.
Was thinking about putting a 85 fuel pump in it but not sure how to install it. Looking for a C3 mechanic near me. Any help appreciated.
Vette(s): 1982 Black, ZZ4, Hooker Side Pipes, 3.55 Rear,
Rebuilt & upgraded 700R4, All new suspension, brakes, & new Charcoal interior.
Where is Brockport, NY? The fuel pump is not hard to change. When you put a new ECM in there it needs to be driven so it can learn, it should smooth out once it does, unless there is something else going on. I put the '85 pump in mine and it ran much better. The old one could not deliver the volumn needed at higher revs. Don't worry about the higher pressure because the throttle body has a pressure regulator.
Vette(s): 1981 Great White Shark. Red Interior, 350/190hp. PS, PB (SS), A/C CC, T-Tops, Going to remain as Stock as possible. Served three years in Active Duty Army, then Retired Air Force after 34 years! Badger State Vetts Car Club. 175,000 Original miles!!
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
You need to determine what fuel pressure you have, if any. You should be able to buy/borrow a pressure gauge from a parts store. There is a shrader valve in the fuel line by the throttle body, with a screw on cap on it. take the cap off, screw the gauge onto the fitting, and crank it. See what kind of pressure it has. You actually should see pressure there for a few seconds even without cranking the engine. It kinda sounds like it's getting just enough fuel to start/sputter, but obviously not enough to run. With the air cleaner off, can you see a decent fuel spray from either/both of the injectors for the few seconds it runs?(might need a helper for that).
____________________________________ Joel Adams C3VR Lifetime Member #56 My Link
Not running yet. but have fuel pump and new filter and new gasket ready to go in also have new fuel pump relay for it tho not the same as the relay that was on the back of the coputer mounting plate. different shape and cinnections .
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