Car hesitates when accelerating

SEBASTIANTUDON

MEMBER
2004 PONTIAC GTO
5.7L
V8
2WD
AUTOMATIC
138,000 MILES

Car hesitates at low speeds, if I’m driving at low speeds and do a mild acceleration car hesitates and then picks up speed it takes a few seconds and kinda jerks forward.

Wednesday, February 5th, 2020 AT 3:43 PM

7 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

Two things come to mind.

https://www.2carpros.com/articles/engine-hesitates

1. Low fuel pressure. Test the fuel pressure to be sure it is correct. Low fuel pressure will cause this issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

2. A partially clogged catalytic converter could cause this as well as the engine cannot breathe correctly.

https://www.2carpros.com/articles/bad-catalytic-converter-symptoms

Roy

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Wednesday, February 5th, 2020 AT 6:39 PM

SEBASTIANTUDON

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30 POSTS

If it is something with the fuel system does that mean the fuel pump is going bad?

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Wednesday, February 5th, 2020 AT 6:47 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

It is possible, yes, but needs to be confirmed.

It could also be the regulator or injectors as well.

Roy

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Wednesday, February 5th, 2020 AT 6:54 PM

SEBASTIANTUDON

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Is there a way to check the regulator or the injectors?

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Wednesday, February 5th, 2020 AT 7:46 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

If you test the fuel pressure, that will tell you if you have the correct pressure, then you can also see if the pressure bleeds off. It will lower a little but should no go to 0.

I posted the procedure in my first response.

Roy

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