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

85,555

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.

9,675

Check fuel pressure with a manual gauge

Your Answer:

Shortcuts

GMC Suburban Experts

  • #1
    ShadetreeMech
    Reputation
    260
  • #1
    Larry Thibert
    Reputation
    260
  • #3
    tennisshoes
    Reputation
    180
View All

Related Models For Sale

Used Chevrolet Suburban
10 Great Deals out of 553 listings starting at $9,700
Used GMC Yukon
15 Great Deals out of 1,145 listings starting at $3,995
Used Chevrolet Tahoe
14 Great Deals out of 877 listings starting at $6,999
Used Ford Expedition
17 Great Deals out of 421 listings starting at $2,400
Used GMC Sierra 1500
74 Great Deals out of 11,073 listings starting at $4,499
Used Ford F-150
123 Great Deals out of 11,298 listings starting at $369
Used Dodge Durango
31 Great Deals out of 1,128 listings starting at $4,890
Used Ford Explorer
21 Great Deals out of 1,793 listings starting at $4,490

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.