Car not taking all gas when pedal push down?

2006 PONTIAC GRAND PRIX
185,671 MILES • V6 • 2WD • AUTOMATIC
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WOLFMAN82
  • MEMBER
  • 1 POST
I bought all 3 coil packs new plugs n wires new upstream sensor and still not taking all the gas when I push pedal down it sounds like bad plugs, but I replaced all of them Thanks and hope to hear back.
May 2, 2025 at 5:20 PM
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JACOBANDNICKOLAS
  • CAR REPAIR CONTRIBUTOR
  • 110,190 POSTS
Hi,

By chance, is the check engine light staying on or flashing? Based on the description, it should be. If so, you should scan the computer to see what codes are stored. Most parts stores will do it free of charge.

Next, if you find there is a random misfire, confirm the fuel pressure is within specification. If the pump is weak, it won't keep up with the demand.

Here is a link that explains how to test pressure:

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

If you look below, I have attached the manufacturer's fuel pressure specifications. You will need a fuel pressure gauge, but most parts stores will lend one to you.

Let us know if this helps or if you have other questions.

Take care,

Joe
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May 2, 2025 at 8:39 PM
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