I having some trouble with my 96 Jimmy. (4.3 l. Vortec)
The first start in the morning (cold or not) is fine. The next start after
that, the engine will "catch" for maybe 1 or 2 revolutions, then die. If I
then wait 20 seconds, then turn it over for anywhere from 5 to 15 seconds,
it starts and runs fine. It doesn't have any predictable pattern, except it
always starts no problem in the morning. After that it is hit and miss, with
maybe a 40% chance it won't start the first try.
The trouble did start after the fuel pump was replaced, so of course that's
the first thing I checked. The fuel pressure, both the prime and the
running, is exactly where it should be. (I haven't caught it not starting
with the pressure gauge on.) I'm running injector cleaner through now, but
there doesn't seem to be any improvment after one tank.
I don't know if it's related, but maybe it will twig something in someone,
but the gas gauge is also reading incorrectly now. (Reporting 1/8th when
dry... luckily I was only half a block from the gas station!)
The truck runs great once it has started, no lag, no roughness, no loss of
I'm stumped! Any suggestions would be greatly appreciated.