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2001 GMC Yukon XL 1500 SLT 5.3L Misfire
Posted to GM Driveability on 1/3/2007 13 Replies

vehicle came in originally with P0300, P0171, P0174, found open plug wires and 5lbs of backpressure in exhaust, replaced above componenets ran great, now has P0300, only misfires on cold start until you reach about 130 degrees misfire goes away, pressure dropp...

FIX posted 1/5/2007

13 Replies Received (View Replies)

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car Vehicle Data

2001 GMC Yukon XL 1500 SLT

Engine5.3 L / 8 cyl / GAS
Trans4-speed Automatic (Electronic)
DeliveryFI / sefi
EmissionsOBD-II Compliant

Trouble Codes

P0300Multiple Misfire Detected