Needing help with a Pontiac question

Asked by Katiepb Apr 10, 2020 at 07:00 PM about the 2001 Pontiac Grand Prix GTP

Question type: Maintenance & Repair

So I replaced my fuel pump on my Pontiac Grand
Prix n it has a full tank but every now n then it dies
n black smoke comes out n acts like it’s not getting
any gas idk what else it could be help plz

2 Answers
2,270

RickMN answered 4 years ago

Black smoke indicates it's running on a very rich mixture. That can be caused by leaking fuel injectors. But many other possiblitiles. If you have a scan tool, start by reading the short and long term fuel trim numbers to see if the rich mixture is being commanded by the PCM.

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26,865

taver91 answered 4 years ago

Also see if it is throwing any error codes that would indicate a different fuel system problem. Another sign of leaking fuel injectors is pre-ignition knock or backfires upon deceleration.

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