Dennis91RS

i put a set of 350 injectors in my car today.it runs pretty good only problem is after it warms up when you do a quick rev a small trace of blue smoke shoots out the tailpipes but other than that everything seems Aok!

steve8586iroc

You might want to run a little warmer thermostat, the ecm may be adding a little to much fuel.

Steve

V8Astro Captain

iTrader: (1)

Blue smoke is usually oil. Anyway, I would bet the ECM is adding too much fuel...that's what happens when you MISMATCH fuel injectors and PROM settings.

Dan W

From your sig your motor looks stock... why did you go with the bigger injectors? What about your combo makes you think you need them?

CamaroGuy71

blue smoke is definately oil burning... probably leakdown from the valve seals or something. Too much fuel is rich so thats black smoke.

Dennis91RS

its a small trace of smoke and it smells like gas but the car is not bogging or anything runs like it did before

i was recommended to put the injectors in because i was told that when i do put header on my car it would lean it out a bit

Dan W

It is true that the header swap will lean it out a little bit... but the factory tune is VERY conservative and you should not be going lean enough with only a header swap to need larger injectors.

You need to determine if you need more fuel and not just shoot from the hip. Did the plugs show signs of detonation before the injector swap? Did you do any kind of testing be it track, dyno or g-tech?

If i were you I'd pull your too big injectors out that are washing down your rings and put the old injectors back in. Do the adjustable fuel pressure regulator mod to your throttle body and get a fuel pressure gauge. Run the car at the track, a dyno or with an accelerometer increase your pressure 1 psi at a time and determine if you see gains with added fuel pressure. If you do see gains leave the pressure at the point where you saw the biggest gains.

If you insist on running those too big injectors you are going to have to learn to tune, change your injector constant (tells the ECM how big the injectors are) and re-work you fuel tables.