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I have a 2003 GMC envoy 4.2l. Engine ran great smooth but
I have a 2003 GMC envoy 4.2l . Engine ran great smooth but had knock. I replaced engine with a 78,000 mile one that ran great in SUV before being pulled. After replacing engine runs great until you tu… read more
Matt
Matt
Engineer
Bachelor's Degree
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2003 GMC Envoy XL SLE Check engine light is on. I did a
2003 GMC Envoy XL SLE Check engine light is on. I did a diagnostic test. Codes P0013 and P1345 appeared. Changed VVT, camshaft sensor, crankshaft sensor, changed oil, oil filter, cleaned throttle body… read more
JFN1
JFN1
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2005 gmc yukon AWD 5.3l has 2 codes PO 0220 and PO2135 which
2005 gmc yukon AWD 5.3l has 2 codes PO 0220 and PO2135 which are both throttle position sensor codes. I need to know if its the throttle body or the whole pedal assembly that controls the throttle. di… read more
Ivan Alvarez
Ivan Alvarez
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Two questions: I just bought a really clean 2005 Envoy SLT
Hi, Two questions: I just bought a really clean 2005 Envoy SLT with 92,000 miles. The first day I drove the twenty miles to work on the highway, it was fine. On the way home though, I noticed slight s… read more
Eric
Eric
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N/A
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PO 300 and PO101 codes. 2007 Envoy Denali with 5.3// Seafoam
Seafoam in tank now, and seafoamed top end , prior to this I has inefficient Bank two, but now yesterday I got a 171 … read more
sprinkles08
sprinkles08
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I have a 2011 GMC Sierra 1500 and today I noticed that while
I have a 2011 GMC Sierra 1500 and today I noticed that while at stop lights the RPM fluctuates from say 700 rpm to 300. When it does this upon driving off the transmission clunks hard in first gear bu… read more
Dan
Dan
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When scanned my vehicle pulls po121 TPS code. I replaced the
When scanned my vehicle pulls po121 TPS code. I replaced the TPS and the code has returned even though the vehicle is running much smoother. I need to rid myself of this code so I can be inspected.… read more
Gm Tech (Cam)
Gm Tech (Cam)
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Vocational, Technical or Trade Scho
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2003 Envoy inline 6 idle rough when stopped no check engine
2003 Envoy inline 6 idle rough when stopped no check engine light. After it runs for a while its alright.… read more
Gary
Gary
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Hubs started by cleaning throttle body on my 08 Acadia. It
Hubs started by cleaning throttle body on my 08 Acadia. It was driving sluggish and didn't want to get up and go. Prior to that CEL had come on and code said something about a sensor. Maybe TPS.. Anyw… read more
Gary
Gary
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GMC Envoy XL SLT: Cam,Have a 2005 Envoy, 4.2 L with
Cam, Have a 2005 Envoy, 4.2 L with codes p0106 &p0420, replaced map sensor & catalytic converter, 292,000 miles, runs great, little oil use… read more
Ron
Ron
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GMC Envoy: 2003 GMC envoy What is problem when tach goes
2003 GMC envoy What is problem when tach goes up and down 200-400 rpms when operating under 2000 rpms. Sometimes when idleing the tach will go up and down several times then shut off.… read more
Gary
Gary
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GM Yukon XL: Having terrible misfire problems in 2003 Yukon
Having terrible misfire problems in 2003 Yukon XL 5.3Z Flex motor. Getting P0300 misfire codes and MAF code. Software shows multiple cylinder misfires on #1, #3, #7 cylinders on left bank and #2 cylin… read more
Gary
Gary
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GMC Envoy: I have a 2003 GMC Envoy 4wd 4.2L XL SLT that as
I have a 2003 GMC Envoy 4wd 4.2L XL SLT that as 180,000 miles on it. I just recently changed the Instrument Cluster and MAP sensor. An now when I start the car and let it Idle, it will run good for a … read more
lt1camaro03112
lt1camaro03112
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GMC Envoy: Where is the throttle body located on a GMC Envoy
Where is the throttle body located on a GMC Envoy "2006". It appears the vehicle when driving, the throttle is either sticking or the sensor is bad. What can I do before taking to dealership for repai… read more
Gary
Gary
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GMC Envoy: Envoy code P0506 2007 GMC Envoy 6 cyl Two Wheel
Envoy code P0506 2007 GMC Envoy 6 cyl Two Wheel Drive Automatic 62000 miles What does it mean when your RPM's are to low?? Do I need to seek immediate attention on this? Is it imperative the dealershi… read more
Anthony
Anthony
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GMC trailblazer: 06 4.2L boggs down on accelleration
06 trailblazer 4.2L boggs down on accelleration and no power. idles smooth but no power on foot in pedal. will rev at idle up to 4krpm, but in gear no power and less than 2.5krpm. Replaced O2 sens, Ma… read more
Gm Tech (Cam)
Gm Tech (Cam)
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GMC Envoy SLT: 2002 Envoy, 170K miles, Bought used and owned
2002 Envoy, 170K miles, Bought used and owned for 8 years. Engine has died three times in last six months. Twice while stopped at traffic light and once while turning into parking garage. Idle seems f… read more
Gary
Gary
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first thing in morning i start my 2003 envoy it starts rpm
first thing in morning i start my 2003 envoy it starts rpm says 900 but sounds like its running on 4 cyl step on gas it only goes 5 miles per hour even with pedal to the floor.. lite on dash says redu… read more
Amedee
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Meet the Experts:

Gm Tech (Cam)

Gm Tech (Cam)

GMC Mechanic

1,832 satisfied customers

GM Grand Master Technician 2007. 14 year experience.

Gary

Gary

ASE Certified Technician

18,051 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

675 satisfied customers

16 years of experience

Ron Z.

Ron Z.

- GMC Tech -

285 satisfied customers

18+yrs experience. State Inspector & GMC Diagnostics/Repair

JFN1

JFN1

ASE Certified Technician

272 satisfied customers

GM Master Technician

George H.

George H.

ASE MasterTechnician

230 satisfied customers

15+ Years ASE Master Technician with Level 1 Certification

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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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