How do I find my misfire?
I have a 2003 GMC Yukon. I have misfires on 1,3,5,&7. I have good compression, spark, and injector pulse. I checked injector balance and all injectors flow the same. It has a 4.8 V8. Can anyone tell me what to check next?

The Yukon added some nice options for 2003 that include enhanced Bose audio, a DVD system, and push-button controls in the steering wheel. Overall, this full-size SUV has 7 trims: Base, Base 4WD, SLE, SLE 4WD, SLT, SLT 4WD, and Denali 4WD. The Yukon offers 3 V8 powertrains: a 4.8 L, 275 hp, 4.8 L, 285 hp, and 6.0 L, 325 hp.
Gas mileage averages out to around 14 mpg in the city and 19 on the highway. All trims have 4 doors and seat anywhere from 6 to 9, depending on which variation you choose. Max towing capacity can go anywhere from around 8000 lbs. up to nearly 9000 lbs. Cargo capacity reaches up to 105 cubic feet if you fold down the second row and take out the third.
As with most Yukons, the 2003 edition gets high marks for its engines and passenger room. However, the '03 Yukon could use better exterior and interior materials. That said, this SUV delivers pretty much everything you'd expect from a quality domestic model and a little more.
I have a 2003 GMC Yukon. I have misfires on 1,3,5,&7. I have good compression, spark, and injector pulse. I checked injector balance and all injectors flow the same. It has a 4.8 V8. Can anyone tell me what to check next?
Hello there, I have a 2003 Yukon Denali. The driver's seat is ripped. Can I use the leather bottom cover of a rear left hand side captain seat to replace the existing one of the driver's seat?
I recently purchased a new radio from Walmart and a wiring harness adapter from Amazon which I will link to at the bottom. I hooked it all up but I am not getting any power. I have seen here and there that the extra red wire with the harness may need to be ran elsewhere but I want to be sure before I end up shorting something out. Thanks. Radio - https://www.walmart.com/ip/Dual-Electronics-XDM17BT-Single-DIN-Car-Stereo-Bluetooth-Siri-Google-Assistant-USB-MP3-AM-FM-Radio/223451013?athbdg=L1200 Harness adapter - https://www.amazon.com/dp/B09V45NCYF?psc=1&ref=ppx_yo2ov_dt_b_product_details
I have a 2003 Yukon and I have been trying to get it to crank, but it won't. It never turns over and you can hear very rapid clicking in the dash. Also, when locking the doors with the keyfob, the horn is very faint. The battery is new and I have tried tapping on the starter while trying to crank it. Any ideas?
HI there all! I have a question about my 2003 Yukon XL. It has been flashing a low oil message at me for a while, but we know that it is just a bad sensor. That we have had replaced in the past, but it just keeps going bad really fast. I was wondering I there is anyway that I could disable the message, or at least disable the dinging sound when it goes off. Another note Is that it only ever going off if I'm stopped, once I start moving again it goes off. Not sure if that makes a difference. But thank you all again, I can't seem to find anything on this online so i'm hoping someone may have a solution for me!
Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Steering wheel: tilt-adjustable
Drivetrain
Axle ratio: 3.42
Exterior Features
Front bumper color: chrome · Rear bumper color: chrome
Lights
Headlights: Auto on/off
Rear Seats
Type: split-bench
Roof
Roof rack color: black
Seats
Front seat type: split-bench · Upholstery: vinyl
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio · Rear audio: rear volume control
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Adjustable pedals: power · Dimming rearview mirror: auto-dimming · Multi-function remote: keyless entry · Steering wheel: tilt-adjustable · Steering wheel mounted controls: audio
Drivetrain
Axle ratio: 3.42 · Locking differential: rear
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: power
Rear Seats
Type: split-bench
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: cloth
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Airbags
Dual front airbags · Front side airbags
Audio System
AM/FM radio
Brakes
ABS: 4-wheel
Convenience Features
Steering wheel: tilt-adjustable
Drivetrain
4WD Type: part time · Axle ratio: 3.73
Exterior Features
Front bumper color: chrome · Rear bumper color: chrome · Skid plate(s): front and rear
Lights
Headlights: Auto on/off
Rear Seats
Type: split-bench
Roof
Roof rack color: black
Seats
Front seat type: split-bench · Upholstery: vinyl
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio · Rear audio: rear volume control
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Adjustable pedals: power · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: keyless entry · Steering wheel: tilt-adjustable · Steering wheel mounted controls: audio
Drivetrain
Axle ratio: 3.42 · Locking differential: rear
In Car Entertainment
Video system: DVD player
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: auto-dimming
Rear Seats
Type: captains chairs
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: leather
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio · Rear audio: rear volume control
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Adjustable pedals: power · Dimming rearview mirror: auto-dimming · Multi-function remote: keyless entry · Steering wheel: tilt-adjustable · Steering wheel mounted controls: audio
Drivetrain
4WD Type: part time · Axle ratio: 3.73 · Locking differential: rear
Exterior Features
Skid plate(s): front and rear
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: heated
Rear Seats
Type: split-bench
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: cloth
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags
Audio System
Single disc in-Dash CD · Premium Brand: Bose · AM/FM radio · Rear audio: rear volume control
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Adjustable pedals: power · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: keyless entry · Steering wheel: tilt-adjustable · Steering wheel mounted controls: audio
Drivetrain
4WD Type: part time · Axle ratio: 3.73 · Locking differential: rear
Exterior Features
Skid plate(s): front and rear
In Car Entertainment
Video system: DVD player
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: auto-dimming
Rear Seats
Type: split-bench
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: leather
Suspension
Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent
Air Conditioning
Automatic climate control front air conditioning · Dual front air conditioning zones
Airbags
Dual front airbags · Front side airbags
Audio System
6 disc in-dash CD · MP3 player: CD MP3 Playback · Premium Brand: Bose · AM/FM radio · Rear audio: rear volume control · Satellite Radio: SiriusXM
Brakes
ABS: 4-wheel
Comfort Features
Steering wheel trim: leather
Convenience Features
Adjustable pedals: power · Dimming rearview mirror: auto-dimming · Memorized settings: driver seat · Multi-function remote: keyless entry · Steering wheel: tilt-adjustable · Steering wheel mounted controls: audio
Drivetrain
4WD Type: full time · Axle ratio: 3.73 · Locking differential: rear
In Car Entertainment
Video system: DVD player
Lights
Exterior entry lights: security approach lamps · Headlights: Auto on/off
Mirrors
Exterior mirrors: power
Rear Seats
Type: captains chairs
Roof
Moonroof: power · Roof rack color: black
Seats
Front seat type: bucket · Upholstery: leather
Suspension
Air Suspension: rear · Front Spring Type: torsion bars · Front Suspension Classification: independent · Front Suspension Type: double wishbones · Leveling: self leveling suspension · Rear Spring Type: coil springs · Rear Suspension Classification: solid live axle · Rear Suspension Type: multi-link
Telematics
Satellite communications: OnStar
Third Row Seat
Type: 50-50 split bench
Tires and Rims
Wheel type: aluminum alloy
Windows
Front wipers: intermittent