1987 Pontiac Grand Am needs help

Tiny
STRAWBERRY210
  • MEMBER
  • 1987 PONTIAC GRAND AM
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 210,899 MILES
My car is burning black exaust from the muffler, and when driving in reverse she cuts out, and when slowing down she stalls out, we replaced the oxygen censor and new spark plugs and still no difference, can you please tell me what the problem is. Thank you
Thursday, November 6th, 2008 AT 12:18 PM

4 Replies

Tiny
RENAUDTN
  • MECHANIC
  • 636 POSTS
Black smoke means you're burning too much fuel.
You could have a leaky fuel injector, or a clogged air filter, defective fuel pressure regulator.

A residual fuel pressure test should tell you if your injectors or fuel pressure regulator are leaky.
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Thursday, November 6th, 2008 AT 3:39 PM
Tiny
STRAWBERRY210
  • MEMBER
  • 3 POSTS
Thankyou for your advise on my lemon lol, we checked out the fuel injectors and she's not leaking fuel the suction from the injectors are good. Is there anything I can check. Your advise I need please help me, just to remind you, I have a 1987 pontiac grand am v6 or 3.O thank you anne p.S I will recomend you to all my friends.
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Friday, November 7th, 2008 AT 11:45 AM
Tiny
STRAWBERRY210
  • MEMBER
  • 3 POSTS
Thankyou for your advise on my lemon lol, we checked out the fuel injectors and she's not leaking fuel the suction from the injectors are good. Is there anything I can check. Your advise I need please help me, just to remind you, I have a 1987 pontiac grand am v6 or 3.O thank you anne p.S I will recomend you to all my friends
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Friday, November 7th, 2008 AT 11:48 AM
Tiny
RENAUDTN
  • MECHANIC
  • 636 POSTS
Have you done a residual fuel pressure test (That involves hooking a pressure gauge to your fuel system, like at the fuel rail)?
If it drops, that would indicate a leak in your fuel delivery system, likely an injector or a pressure regulator.
That's what you need to do at this point. You may have a leaky o-ring on one/several of your injectors.

If the test is good, you need to check some of your sensors, like the O2 sensor. It's possible that one of them is messed up and doesn't send proper input to your pcm.

Also check your timing, and take a look at your spark plugs to make sure they're in good shape.
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Friday, November 7th, 2008 AT 3:32 PM

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