10 mpg with new Jasper engine & transmission

Asked by May 02, 2016 at 06:15 PM about the 2001 GMC Sierra 2500HD 2 Dr SL 4WD Standard Cab LB HD

Question type: Maintenance & Repair

1993 GMC Sierra runs rich.  ALL components new and I mean everything, Jasper 5.7 engine and transmission.  I have talked to several full time mechanics and nobody has an answer?????

3 Answers

47,865

Did the O2 sensors get plugged back in during engine replacement? Is the check engine light on?

Bob, I've been dealing with this problem for some time and swapped 3 sensors... I wish an engine light would come on so I could get a little closer to finding the answer. Expecting to keep the truck till the end of time I went all out with engine, transmission and ALL components, again everything! Six other mechanics have had their hands on this thing without success.

47,865

I know the spark plugs are new, but have you pulled them to see what the coloring looks like? Does the engine feel like it is running at full power?

Your Answer

Add photo

Related Questions

Sierra 2500HD

Looking for a Used Sierra 2500HD in your area?

CarGurus has 13,285 nationwide Sierra 2500HD listings starting at $2,650.

ZIP:

Search GMC Sierra 2500HD Questions

GMC Sierra 2500HD Experts

#1 iEATricers
iEATricers
Reputation 120
#2 jeremyd12
jeremyd12
Reputation 110
#3 Markguidry856
Markguidry856
Reputation 100
View All

Related Models For Sale

Used Chevrolet Silverado 2500HD
271 Great Deals out of 28,148 listings starting at $2,500
Used GMC Sierra 1500
764 Great Deals out of 69,764 listings starting at $1,800
Used Ford F-250 Super Duty
324 Great Deals out of 46,200 listings starting at $599
Used Dodge Ram 2500
148 Great Deals out of 5,231 listings starting at $2,900
Used Chevrolet Silverado 1500
1,831 Great Deals out of 182,473 listings starting at $1,595
Used Ford F-150
2,064 Great Deals out of 208,256 listings starting at $290
Used Ford F-350 Super Duty
406 Great Deals out of 25,713 listings starting at $1,995
Used GMC Sierra 2500
155 listings starting at $3,695
Used Toyota Tundra
437 Great Deals out of 34,780 listings starting at $1,991
Used GMC Sierra 1500HD
5 Great Deals out of 116 listings starting at $2,995
Used GMC Yukon
390 Great Deals out of 20,076 listings starting at $2,495
Used Chevrolet Silverado 2500
5 Great Deals out of 254 listings starting at $4,200

Used Cars For Sale

2017 GMC Sierra 2500HD For Sale
3 Great Deals out of 7,738 listings starting at $31,254
2016 GMC Sierra 2500HD For Sale
8 Great Deals out of 1,187 listings starting at $27,080
2015 GMC Sierra 2500HD For Sale
11 Great Deals out of 979 listings starting at $23,900
2014 GMC Sierra 2500HD For Sale
5 Great Deals out of 281 listings starting at $18,900
2013 GMC Sierra 2500HD For Sale
3 Great Deals out of 518 listings starting at $9,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.