have an 03 gmc sierra 2500hd has 276000 miles on it did cylinder contribution test all cyl. came uo about the same no real diffrences but smokes at all times with no loss of power does have tuner


Asked by Aug 03, 2015 at 03:56 PM about the 2003 GMC Sierra 2500 4 Dr SLT 4WD Extended Cab SB

Question type: Maintenance & Repair

smokes at all times but runs good no injector codes contribution all pretty typical 678 to 681

1 Answer

Kelly Mayo

start with trying this > Lucas Oil 10278 Engine Oil Stop Leak - 1 Quart

Your Answer

Add photo

Related Questions

  • Rough idle in cold weather 9 answers

    In cold weather my 2000 sierra starts, reves up idles back down to rough idle and continues to do so for about a minute. Once it warms up runs great and does not do this in warm weather. Have had seve...

    2000 GMC Sierra 1500 SL Standard Cab SB


    Maintenance & Repair

  • GMC 2012 delayed start

    So I used a bulldog GT tuner on my truck and when it finished tuning my truck wouldn't start. It acted like it was out of fuel. It would crank but it wouldn't start. I removed the tune and now it s...

    2012 GMC Sierra 1500 SLE Crew Cab 4WD


    Maintenance & Repair

  • transmission shifts hard 13 answers

    5.3 L engine (from 2002 Silverado) with a 4l80e transmission shifting hard from 1st to 2nd gear. All other gears shift normal

    2001 GMC Sierra 1500 SLT 4WD Extended Cab LB


    Maintenance & Repair

  • Aftermarket upgrades 3 answers

    I'm considering installing an aftermarket tuner, a cold air intake, and an exhaust system in order to improve my gas mileage. Will these upgrades really improve my gas mileage? Could these upgrade...

    2016 GMC Sierra 1500 SLT Double Cab 4WD


    Car Customization

  • 7.3 diesel stalls for no reason.... Changed fuel filter. Any ideas? 18 answers

    Banks 6gun tuner and turbo and waste gate. Dies for no reason while driving

    2002 Ford Excursion Limited Ultimate 4WD


    Maintenance & Repair

Search GMC Sierra 2500 Questions

GMC Sierra 2500 Experts

#1 Rowefast
Reputation 150
#2 FordNut
Reputation 100
#3 tennisshoes
Reputation 70
View All

Related Models For Sale

Used GMC Sierra 2500HD"
159 Great Deals out of 15,280 listings starting at $3,900
Used GMC Sierra 1500"
1,025 Great Deals out of 55,663 listings starting at $2,400
Used Chevrolet Silverado 2500"
6 Great Deals out of 279 listings starting at $3,290
Used Chevrolet Silverado 2500HD"
393 Great Deals out of 33,905 listings starting at $2,998
Used Chevrolet Silverado 1500"
2,453 Great Deals out of 142,602 listings starting at $1,195
Used Dodge Ram 2500"
151 Great Deals out of 5,797 listings starting at $2,289
Used Ford F-250 Super Duty"
460 Great Deals out of 42,651 listings starting at $2,250
Used Ford F-150"
3,174 Great Deals out of 214,895 listings starting at $1,000
Used GMC Sierra 1500HD"
9 Great Deals out of 126 listings starting at $3,950
Used Toyota Tundra"
640 Great Deals out of 26,028 listings starting at $2,500
Used GMC Sierra 3500"
9 Great Deals out of 309 listings starting at $5,495
Used Dodge Ram 1500"
542 Great Deals out of 13,842 listings starting at $1,595

Used Cars For Sale