Hi Group, My wifes '94 Chevy full size pick-up with 4.3 liter TBI Vortec engine has what seems to be a cold start prob. As the day warms up it gets better but it still seems to be lacking power. I put new cap / rotor, plugs, wires, fuel filter, and the problem persists. Any suggestions as to what I can check??? Any & all help greatly appreciated,........ Herman.
Hard start/stalls 4.3 TBI Vortec
Apr 27, 2004
5 Replies
Hi Group, My wifes '94 Chevy full size pick-up with 4.3 liter TBI Vortec engine has what seems to be a cold start prob. As the day warms up it gets better but it still seems to be lacking power. I put new cap / rotor, plugs, wires, fuel filter, and the problem persists. Any suggestions as to what I can check??? Any & all help greatly appreciated,........ Herman.
Sounds like your fuel pump is getting weak...ready to quit...check the fuel pressure with a pressure gauge or have someone check it for you.
Leaking CPI unit or bad pressure regulator. Both are inside the manifold, not hard to replace but not real cheap.
Well,. I did a fuel pressure test & it reads about 8psi. This indicates a pump going bad (weak)??? Thanks for all advice,... Herman.
I may be very wrong, but I would say it should be about 60-66PSI, key on, engine off....
~KJ/TLGM
Join the Discussion
Have something to add? Share your thoughts — no account required.
Didn't find your answer?
Ask the community — no account required