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1994 Pontiac Grand Am loud poping backfire from throttle bo

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

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 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
Tiny
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
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 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

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