I have an 04 GMC Envoy 6 cylinder 4.2. The service engine soon light came on this morning and was running a little rough. We ran around a little bit before stopping at Auto Zone, they hooked up there tester and said you have a misfire in cylinder 4. They said it could be spark plugs or maybe a clogged injector. I bought some spark plugs and went home. I shut the car off and restarted a couple of hours later and the service engine light did not come back on and it seemed to run fine. Any ideas?

Mark Olson

Asked by Mark Jun 08, 2014 at 07:09 PM about the 2004 GMC Envoy XL SLT 4WD

Question type: Maintenance & Repair

2 Answers


Could have been some water in your gas if you did not change anything. But most times it's the plugs or plug wires(boots)or coils that cause this code.

1 out of 1 people think this is helpful.

If you have over 100,000 miles on it you're due for a tune up. Change the spark plugs and wires (or boots on coil overs). If it's never been tuned up yet you could have a spark plug or wire (boot) that's beginning to fail. HTH. -Jim

Your Answer

Related Questions

  • the speedometer shoots all over the place, it happened last winter- had no problem all spring, summer, and fall now is acting up again. 1 answer

    aalso the oil gauge is off the gauge it is way over 80. Have talked to a friend that owns GMC also they had the same problem. have brought my car to the shop a very expenive repair any ideas why thi...

    2003 GMC Envoy XL SLE 4WD


    Maintenance & Repair

  • rough idle, stalling, loss of power. 158 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB


    Maintenance & Repair

  • 1981 gmc C-Class 12 answers

    Hi, Have had a 1981 C-Class RV for 3 years, and hope to actually get to use it this year. It has gas issues. Took it for a trip last year, and it gave up after 2 hours. Prior to giving up, it ran...

    1990 GMC R/V 3500 Series


    Maintenance & Repair

  • Losing engine power with no warning 3 answers

    I recently took my Yukon (140,000miles) up to a local mountain(4000ft elevation) , it drove up the curvy steep road fine. Engine ran a little warm, a smidgen above center, but no problem till we app...

    2007 GMC Yukon Denali XL AWD


    Maintenance & Repair

  • what would cause my 1994 GMC 1500 sierra to not start after oil change 19 answers

    His truck was running a bit rough before he did the oil change, now the truck won't start at all. Can you maybe give us some ideas on what may be wrong with it? Thank you for any information you can...

    1994 GMC Sierra 1500


    Maintenance & Repair

Search GMC Envoy XL Questions

GMC Envoy XL Experts

#1 skinnyginnie
Reputation 50
#2 John Leone
John Leone
Reputation 40
#3 Mike Bonnell
Mike Bonnell
Reputation 30
View All

Related Models For Sale

Used GMC Envoy"
154 Great Deals out of 2,876 listings starting at $2,890
Used GMC Envoy XUV"
10 Great Deals out of 208 listings starting at $3,990
Used Chevrolet TrailBlazer"
356 Great Deals out of 6,930 listings starting at $1,200
Used Chevrolet TrailBlazer EXT"
93 Great Deals out of 1,739 listings starting at $1,500
Used GMC Yukon"
326 Great Deals out of 10,787 listings starting at $1,999
Used Ford Explorer"
1,111 Great Deals out of 45,582 listings starting at $1,200
Used Ford Expedition"
459 Great Deals out of 16,422 listings starting at $1,495
Used GMC Yukon XL"
364 Great Deals out of 10,430 listings starting at $1,795
Used Chevrolet Tahoe"
955 Great Deals out of 31,930 listings starting at $1,795
Used Chevrolet Suburban"
632 Great Deals out of 18,466 listings starting at $1,500
Used Jeep Grand Cherokee"
1,048 Great Deals out of 53,605 listings starting at $995
Used GMC Sierra 1500"
761 Great Deals out of 61,426 listings starting at $1,995

Used Cars For Sale

2006 GMC Envoy XL SLT 4WD For Sale
38 listings starting at $6,480
2005 GMC Envoy XL SLT 4WD For Sale
58 listings starting at $5,500
2004 GMC Envoy XL SLT 4WD For Sale
4 Great Deals out of 76 listings starting at $3,850
2003 GMC Envoy XL SLT 4WD For Sale
3 Great Deals out of 79 listings starting at $3,495
2002 GMC Envoy XL SLT 4WD For Sale
18 listings starting at $3,700