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

79,295

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
    4,590
  • #2
    Tom Demyan
    Reputation
    3,170
  • #3
    munron
    Reputation
    2,600
View All

Related Models For Sale

Used Chevrolet Impala
145 Great Deals out of 1,090 listings starting at $1,995
Used Pontiac G6
120 listings starting at $2,500
Used Chevrolet Monte Carlo
14 listings starting at $4,499
Used Pontiac Grand Am
25 listings
Used Pontiac GTO
4 listings starting at $13,900
Used Ford Mustang
3 Great Deals out of 987 listings starting at $3,900
Used Chevrolet Malibu
82 Great Deals out of 1,808 listings starting at $2,495
Used Jeep Grand Cherokee
127 Great Deals out of 4,052 listings starting at $2,595
Used Buick LaCrosse
18 Great Deals out of 353 listings starting at $7,995

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.