Seems a little bit fuel starved sometimes on start; and, if depress accelerator to floor on start, or depress it fast to floor after start, it has a rev hesitation and most times (not all) it backfires once or twice out of the throttle body inj.(TBI) (sometimes a big fireball) then runs fine on idle and slow and partial acceleration or when holding steady at any RPM.
I have noticed the following:
1. There is no gasket on intake manifold (but it ran fine for years that way (I did take it off to get to module).
2. I do see pulsating fuel spraying in TBI while running but did not notice much fuel pressure out of lines at TBI (kind of a dribble) but don't visibly know how much is right. Does not have a fuel pressure check port in gas lines.
3. When changed old gas, the fuel pump in gas tank worked only when engine cranked but not when ign. Was only on "On". Took a long time to empty half tank.
4. Has two wires to top of TBI (one red, one blue) that the pulsing gas spray itself comes from. I do not know if I got these wires back on backwards or if that matters. As said, I do see gas spray pulses coming out into TBI from here. Course, not sure if its enough.
All seems to be related to a fast full acceleration. (And perhaps a sometimes slow start from too little fuel)
Finally, it does seem to maybe be getting just a “tiny” bit better as it runs? (After symptoms, I put half bottle of inj cleaner I had in half full gas tank with the new gas).
Any ideas what the problem might be?
have the same problem?
Wednesday, April 7th, 2021 AT 11:33 AM