i have a yukon 1997 that was missing so i hooked it up to oreileys machine and it said multiple misfires, so i changed plugs and plugwires and it still was missing and finally wont start what do i nee

Asked by Jan 16, 2017 at 11:30 AM about the 1997 GMC Suburban

Question type: Maintenance & Repair

2 Answers

76,315

P0300 GMC - Cylinder Misfire Detected Random Cylinders.... *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... The P0300 code means that a 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.

7,835

Check fuel pressure with a manual gauge

Your Answer

Shortcuts

GMC Suburban Experts

  • #1
    LouB
    Reputation
    1,420
  • #2
    ShadetreeMech
    Reputation
    230
  • #2
    Larry Thibert
    Reputation
    230
View All

Related Models For Sale

Used Chevrolet Suburban
3 Great Deals out of 546 listings starting at $2,871
Used GMC Yukon
5 Great Deals out of 863 listings starting at $3,800
Used Chevrolet Tahoe
3 Great Deals out of 750 listings starting at $3,995
Used Ford Expedition
16 Great Deals out of 379 listings starting at $5,490
Used GMC Sierra 1500
250 Great Deals out of 10,344 listings starting at $1,775
Used Ford F-150
653 Great Deals out of 10,061 listings starting at $2,995
Used Dodge Durango
168 Great Deals out of 1,109 listings starting at $4,490
Used Lincoln Navigator
58 listings starting at $2,888

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.