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MIssfire On Acceleration

Tiny
RORIO
  • MEMBER
  • PONTIAC GRAND AM
Pontiac Grand Am 2.4L Automatic/92,000 miles...No problem starting , or accelerating slowly..Getting a missfire when accelerating hard to get into traffic, or on freeway at low RPM`s.I had it in shop and they were stumped as well as i am. I replaced the fallowing in order. Crank Shaft Position Sensor, Spark Plugs with AC delco PLatinum, Plug wires, both coil packs and housing, Fuel pump , fuel filter, Intake temp sensor, Oxygen sensor, ECU diagnosed and was good, all fuel injectors were ticking. I also cleaned the intake with with carb and chocke cleaner after all these were replaced(was verry filthy) and then replace the plugs once more. It got a lil better but not much. Please help me and give me your insight. I have been spending to much money on the little stuff and just want the problem fix.. Thank you !


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Wednesday, May 23rd, 2007 AT 1:06 PM

3 Replies

Tiny
2CARPRO JACK
  • MECHANIC
  • 11,533 POSTS
Try measuring the resistance across the injectors with a meter and get back at me
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Wednesday, May 23rd, 2007 AT 2:45 PM
Tiny
RORIO
  • MEMBER
  • 2 POSTS
I measured the resistance and they all came back the same, 0.0 and.02. If I was on the right setting or not, they were still the same all across, while I had them out I soaked the bottom of the injectors in carb and choke cleaner for about an hour. I also replaced the o-rings.
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Wednesday, June 6th, 2007 AT 1:13 PM
Tiny
TBDK
  • MEMBER
  • 24 POSTS
I would check and make sure the timing is on perfectly. If it's off just a bit it may do that. Also how is your air filter? May need replacing. Hope this helps in the slightest.
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Friday, June 22nd, 2007 AT 10:19 PM

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