Here is my problem, at high rpm, 5500 + and about 11 psi boost the engine starts missing and stumbling. If I go easy up (low boost) I can take it to 6500. If I keep the rpm low(4 to 5000) I can hit 12psi boost. Other than this the car runs OK, the mileage has dropped a little(3mpg).
Now the stuff you'll ask, plugs Autolite gap at .028 ( I have put 3 different set of new plugs in, all with the same results) The engine is mostly stock, 3' turbo back exhaust, Apexi boost controller, and a walbro fuel pump("J" tube bypassed, no 12v mod) There are no engine codes coming up.
So far every thing I've checked is OK or I have repaired it (broken wires, vacuum tubes off). One thing that seems weird, I connected a voltmeter up to the Vf-T1 at idle 3.5, rev the engine it goes to .5 then back to 3.5, but drive it goes to 5.0 let off the gas it goes to .5, then back to 5.0. When I stop, it stays at 5.0 till I shut off the engine, restart 3.5
I am running out of things to check, anybody got any ideas?
Thanks, Rick
Now the stuff you'll ask, plugs Autolite gap at .028 ( I have put 3 different set of new plugs in, all with the same results) The engine is mostly stock, 3' turbo back exhaust, Apexi boost controller, and a walbro fuel pump("J" tube bypassed, no 12v mod) There are no engine codes coming up.
So far every thing I've checked is OK or I have repaired it (broken wires, vacuum tubes off). One thing that seems weird, I connected a voltmeter up to the Vf-T1 at idle 3.5, rev the engine it goes to .5 then back to 3.5, but drive it goes to 5.0 let off the gas it goes to .5, then back to 5.0. When I stop, it stays at 5.0 till I shut off the engine, restart 3.5
I am running out of things to check, anybody got any ideas?
Thanks, Rick