I have a random misfire code still after replacing a whole bunch of stuff!

Asked by Feb 24, 2017 at 01:03 PM about the 1998 GMC Sierra 1500 C1500 SLE Extended Cab SB

Question type: Maintenance & Repair

i have replaced my spider injecton, plugs and wires, distributor, cap and rotor,
new cats. the egr seems to work fine the pintle thing moves in and out pretty
good unless its not supposed to do that! the only thing i havent done is replace
coil and o2 sensors.

1 Answer

87,145

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 persist more tests needs to be done to diagnose problem.

Your Answer:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,640
  • #2
    John Saffrahn
    Reputation
    4,030
  • #3
    Glenn Clingenpeel
    Reputation
    3,800
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,837 Great Deals out of 155,600 listings starting at $1,799
Used Ford F-150
2,266 Great Deals out of 187,689 listings starting at $495
Used Chevrolet Silverado 2500HD
326 Great Deals out of 28,490 listings starting at $2,500
Used Dodge Ram 1500
328 Great Deals out of 8,863 listings starting at $2,495
Used Toyota Tacoma
459 Great Deals out of 50,124 listings starting at $2,850
Used Chevrolet Tahoe
646 Great Deals out of 37,769 listings starting at $1,995
Used Ford F-250 Super Duty
424 Great Deals out of 36,233 listings starting at $1,999
Used GMC Yukon
326 Great Deals out of 23,849 listings starting at $2,000
Used Chevrolet Camaro
306 Great Deals out of 26,931 listings starting at $2,500
Used Jeep Grand Cherokee
1,148 Great Deals out of 80,317 listings starting at $1,500

Used Cars For Sale

2019 GMC Sierra 1500 For Sale
18 listings starting at $33,000
2018 GMC Sierra 1500 For Sale
33 Great Deals out of 30,679 listings starting at $21,760
2017 GMC Sierra 1500 For Sale
99 Great Deals out of 5,272 listings starting at $16,983
2016 GMC Sierra 1500 For Sale
48 Great Deals out of 2,889 listings starting at $15,990
2015 GMC Sierra 1500 For Sale
73 Great Deals out of 4,875 listings starting at $11,995

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.