Truck is burning fuel rich and doesn't always let code reader work.

Asked by Justin Aug 10, 2023 at 02:28 PM about the 2001 GMC Sierra 1500 SL Standard Cab LB

Question type: Maintenance & Repair

My truck is burning fuel very rich. My tps is working
because my scan tool live data showed me the
percentage of the throttle. It took multiple tries to
get live data and vin to show on my scan tool. I had
to turn the truck on and off multiple times for the
truck to allow the scan tool to use features. I have
the 4.3 V6. Vortec 4300

307,255

Gene answered 8 months ago

Exhaust is black smoke? Fuel pressure regulator, stuck injector drivers, ECT reading cold, ECM lost grounds, ECM getting ready to fail.

Mark helpful

202,415

Ed92626 answered 8 months ago

The most common cause for an engine running rich, especially in a twenty year old vehicle, is a faulty O2 sensor. And that could lead to catalytic converter destruction. Have those checked.

Mark helpful

Your Answer:

Truck is burning fuel rich and doesn't always let code reader work. 2 Answers

My truck is burning fuel very rich. My tps is working because my scan tool live data showed me the percentage of the throttle. It took multiple tries to get live data and vin to show on my scan too...

2001 GMC Sierra 1500 SL Standard Cab LB

-

Maintenance & Repair
Rough idle, run rich, doesn't always start 1 Answer

My truck runs rough at idle, doesn't always want to start, and runs very rich. I've been slowly replacing parts over the last year but none of the parts have helped for very long..2001 sierra 5.3 w...

2001 GMC Sierra 1500 SLE Extended Cab SB

-

Maintenance & Repair
The computer port on my GMC truck does not work. Can't read codes, code reader says "No power!" 2 Answers

The check engine light is on my 2003 GMC. The computer port inside the truck has no power to it. Is there a fuse on this circuit or was that optional equiptment on my base model truck? It has a 4.3L ...

2003 GMC Sierra 1500 STD Standard Cab LB

-

Maintenance & Repair
04 gmc sierra 1500 5.3 died on me on the highway got it towed home starting going at it, hooked two different scanners to it and not throwing any codes (ecm is working bc the map was reading correctly but also the rpm was zero) anyways checked fire none checked injectors they wasnt working either(built fuel pressure then unplugged fuel relay then turned engine over and the pressure stayed the exact same) i assume it might be the crank sensor but i would think it would throw a code, anyways came back this morning and before doing anything for the hell of it i checked the gas cap and tightened it and it fired up perfect three different times and the last time i let it run and it died after bout 45 seconds (fuel pressure reads 55) and after it died its doing the same thing cranks but wont fire or start 1 Answer

died on me on the highway got it towed home starting going at it, hooked two different scanners to it and not throwing any codes (ecm is working bc the map was reading correctly but also the rpm was...

2004 GMC Sierra 1500

-

Maintenance & Repair
Speedometer doesn't work and transmission doesn't shift gears. 86 Answers

The speedometer stays at 0 all the time. When the transmission is in drive it won't come out of 1st gear. Reverse works fine, and if I manually put the transmission in 1st or 2nd it works fine. 199...

1999 GMC Sierra 1500 SLT 4WD Extended Cab LB

-

Maintenance & Repair

Own this car?

Share your experience with others.

2001 GMC Sierra 1500

Write a car review

Review another car

Used Chevrolet Silverado 1500

4,153 Great Deals out of 130,997 listings starting at $1,000

Used Ford F-150

6,050 Great Deals out of 131,250 listings starting at $900

Used GMC Sierra 2500HD

572 Great Deals out of 20,299 listings starting at $6,800

Used Toyota Tundra

1,075 Great Deals out of 32,148 listings starting at $2,650

Used Chevrolet Silverado 2500HD

1,069 Great Deals out of 30,535 listings starting at $3,800

Used Toyota Tacoma

1,930 Great Deals out of 32,042 listings starting at $2,295

Used GMC Yukon

660 Great Deals out of 11,333 listings starting at $1,950

Used Dodge RAM 1500

86 Great Deals out of 1,605 listings starting at $995

Used Chevrolet Tahoe

1,023 Great Deals out of 20,582 listings starting at $1,100

Used Ford F-250 Super Duty

1,400 Great Deals out of 42,029 listings starting at $2,000

2024 GMC Sierra 1500 For Sale

84 Great Deals out of 43,653 listings starting at $28,505

2023 GMC Sierra 1500 For Sale

259 Great Deals out of 4,642 listings starting at $31,987

2022 GMC Sierra 1500 For Sale

171 Great Deals out of 1,690 listings starting at $29,400

2021 GMC Sierra 1500 For Sale

300 Great Deals out of 3,989 listings starting at $19,000

2020 GMC Sierra 1500 For Sale

187 Great Deals out of 2,418 listings starting at $17,990

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. Content will be removed if CarGurus becomes aware that it violates our policies.

Truck is burning fuel rich and doesn't always let code reader work.

2 Answers

Your Answer:

Own this car?

Share your experience with others.

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

Know more, shop wisely

Related Models For Sale

Used Cars for Sale

Truck is burning fuel rich and doesn't always let code reader work.

2 Answers

Your Answer:

Related Questions