1994 Pontiac Grand Am loud poping backfire from throttle bo

SEANSANCHEZ62

MEMBER
1994 PONTIAC GRAND AM
6 CYL
FWD
AUTOMATIC
194,000 MILES

I just replaced my fuel injectors with acel 19lbs fuel injectors eveything was fine for 2 weeks now when I punch the gas there is a loud poping backfire coming from throttle body and loss of power.
I have replaced;
plugs, wires msd coils, map sensor cam pos sensor, 02 sensor new fuel pump, fuel filter, cold air intake, throttle pos sensor. I need help!

Wednesday, August 4th, 2010 AT 10:05 AM

3 Replies

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

Has the check engine light come on? Is that the actual mileage on the engine (possible bad intake valve)? Have you checked fuel pressure and regulator?

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Wednesday, August 4th, 2010 AT 6:53 PM

SEANSANCHEZ62

MEMBER
2 POSTS

No, the check engine light is not on? I havent replaced the fuel pressure regulator but have replaced all other fuel components, I guess my question is it ok to install 19lbs injectors when stock run 17lbs do I need to upgrade anything, like I said there is only loss of power when I step on the gas. Thank you for your help it means a lot I have spent 2000 so far and still have issues im at a loss.

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Thursday, August 5th, 2010 AT 1:43 AM

JACOBANDNICKOLAS

MECHANIC
110,176 POSTS

It isn't a good idea to change the injectors. They should stay OEM pressure. If you have already changed them, that is most likely the problem. My god, you spent a lot. The truck I drive to work everyday only was 60 dollars and that was with a full tank of gas. (LOL) It needed the frame repaired. 20 minutes and that was done. Let me know if you have other questions.

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Thursday, August 5th, 2010 AT 11:11 PM