Question about Pontiac Sunfire

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Car wont idle properly tried lots need help now

Internal miss fire on my 2.4 litre sun fire have chqd sust with scanner sais random multiple missfire new plugs wires coil etc could it be low fuel pressure or regulator or fuel fltr //////????????? need help before i tear out more hair im only 2nd yr tec

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  • jthorig Apr 22, 2009

    thanx ill try that tday let ya know what i find

  • jthorig Apr 29, 2009

    those solutions were not the problem aparently the problem lys with the computer timing thanx though

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  • Pontiac Master
  • 14,036 Answers

You could have partially clogged fuel injectors.or you getting a lean misfire check your fuel pressure .it should be.41 -47 psi.if low replace fuel filter.if dont help.you got fuel pump problems.check all vacuum lines.+ the vacuum line that goes to fuel pressure regulator.

Posted on Apr 22, 2009

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Posted on Jan 02, 2017

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