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I have a 2003 Denali that I replaced fuel injectors on. Now
I have a 2003 Denali that I replaced fuel injectors on. Now it is hard to start for several seconds. A garage told me 2 and 6 cylinder were injectors are not working.… read more
Chris (aka-Moose)
Chris (aka-Moose)
GMC Technician
Vocational, Technical or Trade School
822 satisfied customers
I have a GMC 2007 Yukon Denali XL. I have oil presser gauge
Hi my name is***** have a GMC 2007 Yukon Denali XL. I have oil presser gauge 40 while driving and down to almost 0 when I stop. it use to stay at 40 at all time. Is something bad starting to happen. … read more
Marc
Marc
Mechanic
Associate Degree
1,155 satisfied customers
After ain the rain I have all kinds of issues. the fuel
after a*****in the rain I have all kinds of issues. the fuel gauge has stopped responding, with the truck in drive the gauge is loosing oil pressure (put it in neutral and at any rpm the truck runs gr… read more
BRIAN
BRIAN
Program Coordinator/Professor Automotive
BS
366 satisfied customers
I have a 2010 yukon denali 105,459 miles. after about 15
i have a 2010 yukon denali 105,459 miles. after about 15 mins of driving, it runs rough at idle in drive position. drives just fine. plugs replaced, injectors replaced, tps replaced. new y pipe with 2… read more
AutoDoc1
AutoDoc1
High School Diploma
5,058 satisfied customers
Cam, I have a question for you. I am getting a P0304 code
Hi Cam, I have a question for you. I am getting a P0304 code (cylinder 4 misfire) on my 08 Yukon XL 1500 5.3L. The stabilitrak error pops up along with a Traction control error on the dash display. It… read more
adam warren
adam warren
Master auto tec
236 satisfied customers
Fouled 2 plugs last week and 1 yesterday. Shows all kind of
Fouled 2 plugs last week and 1 yesterday . Shows all kind of different codes. Could this be catalytic converter stopped up. This is on a ‘13 Denali Yukon with 175000 miles. It showed a bad o2 sensor o… read more
Expert
Expert
6,944 satisfied customers
I think I need new spark plugs and coils/wires ... when I
I think I need new spark plugs and coils/wires ... when I start it a chirping sound happens.. and stays on until you get into higher RMS (over 40mph) or during auto stop … read more
Mike V.
Mike V.
technician
Subaru and Nissan factory training.
30,880 satisfied customers
Our 2007 yukon Denali shutts off after driving it at highway
Our 2007 yukon Denali shutts off after driving it at highway speeds for an hour plus. The car is fine while driving at high speeds but once we take it off the highway and apply brakes the oil pressure… read more
David Craig
David Craig
OWNER/MECHANIC
Associates
10,542 satisfied customers
I have a 2006 gmc envoy denali. I've replaced the plugs
I have a 2006 gmc envoy denali. I've replaced the plugs ,wires , fuel injectors and coil packs. My vehicle still reads a misfire and is running like a diesel. When I drive it the check engine light st… read more
Tim\u0027s Auto Repair
Tim\u0027s Auto Repair
Mechanic
High School or GED
15,308 satisfied customers
2008 GMC Yukon hybrid. Random misfire. Replace coil packs
2008 GMC Yukon hybrid. Random misfire. Replace coil packs spark plugs wires still random misfire. Not sure what fuel pressure should be at an idle. Remove fuel rail with injectors still intact to the … read more
sprinkles08
sprinkles08
Technician
High School or GED
19,594 satisfied customers
I'm having major issues I think. Code P0304 is detected for
I'm having major issues I think. Code P0304 is detected for the scan. I have replaced the ignition coils (all 8) new plugs wires. and I have replaced the oil sending unit. It runs even worse now. and … read more
Pete
Pete
Automotive Diagnostic Specialist
General auto certifications
34,660 satisfied customers
2007 Yukon Denali. Check engine light while pulling a car
2007 Yukon Denali. Check engine light while pulling a car and trailer in the tow mode when braking and because of the tow mode decelerating. Code shows Radom misfire but engine runs smoothly and no de… read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
20,905 satisfied customers
2008 Yukon oil pressure light comes on, 166,000 miles.
2008 Yukon oil pressure light comes on, 166,000 miles. Replaced engine, used engine 33,000 miles with warranty for 36,000 or three years. The light tells me to stop engine immediately. The engine has … read more
JOHN aka Eauto
JOHN aka Eauto
self employed
High School or GED
20,905 satisfied customers
I have a 2007 Yukon xl Denali 6.2. When at idle the service
Dave I have a 2007 Yukon xl Denali 6.2. When at idle the service stabilitrak and traction control off light comes on. When I hook it up to our tech 2 the codes for engine misfire detected and fuel sys… read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,141 satisfied customers
I have a 2007 GMC Yukon with code P0304. I have changed
Hello, I have a 2007 GMC Yukon with code P0304. I have changed wires, plug, injector, and have moved coil pack around. #4 still misfire. What else could it be?… read more
Gary
Gary
ASE Certified Technician
Vocational, Technical or Trade Scho
1,589 satisfied customers
I have a 2007 GMC Denali Yukon XL, while driving I got
Hi, I have a 2007 GMC Denali Yukon XL, while driving I got a warning saying low oil pressure and to turn off the engine. Stopped and popped the hood and removed the oil dip stick when i noticed smoke … read more
GM Bob
GM Bob
Automobile Technician
High School or GED
1,141 satisfied customers
GMC Denali: I have a 2003 GMC Denali 5.7 that will not
Hi I have a 2003 GMC Denali 5.7 that will not accelerate & has a rough Idle. When you try to give it gas it falls on its face.… read more
Gm Tech (Cam)
Gm Tech (Cam)
GMC Mechanic
Vocational, Technical or Trade Scho
31,536 satisfied customers
GMC Yukon Denali: Car - 2004 yukon denali awd 6.0 with 125,000
Car - 2004 yukon denali awd 6.0 with 125,000 mi. Im the original owner and have performed all required service intervals since day one, and always use synthetic. Appox 700 mi prior to problem I had ca… read more
Don Knight
Don Knight
Shop Manager/Technican
Associate Degree
1,695 satisfied customers
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

31,536 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

1,589 satisfied customers

GCM master tech over 25 years

Dave Nova

Dave Nova

GMC Technician

929 satisfied customers

ASE Master Certification. GM World Class Certification

Chris (aka-Moose)

Chris (aka-Moose)

GMC Technician

822 satisfied customers

16 years of experience

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

Don - Mo Lurch

Don - Mo Lurch

ASE Certified Technician

259 satisfied customers

GM, GMC, Chevrolet Cert., Heavy Line Mech, Race Shop Owner, Mobile Electronics

Mike S.

Mike S.

ASE Certified Technician

245 satisfied customers

GMC N.A.I.S.E. Certified Auto-Mechanic

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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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