we just changed out plugs and wires, now the check engine light flashing

Asked by Apr 24, 2017 at 07:36 AM about the 2004 Pontiac Grand Prix GT2

Question type: Maintenance & Repair

1 Answer

73,055

A flashing check engine light indicates a miss-fire.Possible causes: Faulty spark plug (s), Faulty ignition coil (s), Clogged or faulty fuel injector (s), Intake air leak, Fuel injectors harness is open or shorted, Fuel Injectors circuit poor electrical connection, Ignition coils harness is open or shorted, Ignition coils circuit poor electrical connection, Insufficient cylinders compression, Incorrect fuel pressure...Cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persists more tests needs to be done to diagnose problem...There is a Factory Service Buliton on the fuel injectors, that is the are I would start to look at, complaints are, • Extended Crank Time • Hard to Start • MIL/SES Illuminated with DTCs • Hesitation • Lack of Power • Surge or Chuggle • Rough Idle • Light or Intermittent Misfire.

Your Answer

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,370
  • #2
    Tom Demyan
    Reputation
    2,980
  • #3
    munron
    Reputation
    2,350
View All

Related Models For Sale

Used Chevrolet Impala
612 Great Deals out of 34,798 listings starting at $1,250
Used Pontiac Bonneville
519 listings starting at $1,799
Used Chevrolet Monte Carlo
12 Great Deals out of 1,350 listings starting at $995
Used Pontiac Grand Am
1,102 listings starting at $1,599
Used Ford Mustang
755 Great Deals out of 42,819 listings starting at $1,300
Used Pontiac G6
81 Great Deals out of 3,901 listings starting at $1,800
Used Pontiac GTO
7 Great Deals out of 465 listings starting at $5,995
Used Chevrolet Malibu
1,248 Great Deals out of 78,132 listings starting at $1,500
Used Chrysler 300
356 Great Deals out of 16,787 listings starting at $1,000
Used Honda Accord
1,029 Great Deals out of 63,288 listings starting at $999

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.