Loss power code 43
110

Asked by Homer Nov 27, 2019 at 10:54 AM about the 1994 GMC Sierra 1500 C1500 SLE Standard Cab LB

Question type: Maintenance & Repair

Truck is throwing 43 code. Not the
knock sensor, new cap button EGR
solenoid,wires plugs, it's fine till third it
will shift to third then bogs down and
loses power, tries to die when stopping
unless I let of of gas and hit it again
then it stays running and does fine till
third again. Doesn't do it in overdrive
but doesn't shift to third either. Please
help. No leaks in vacuum either did the
spray test with carb cleaner

2 Answers
188,435

Paul answered 4 years ago

For kicks and giggles, check to make sure the connection on the knock sensor is tight. If it is the lets put a timing light on it and see if you are at 0 Degrees or if you are at 4 degrees retarded while the engine is up to temp. if that's the case you may have a bad knock sensor. On a cold engine check the the ohm resistance on the sensor it should be 3500 to 4000 ohms...

Mark helpful
110

Homer answered 4 years ago

I'll have to find someone with a timing light to do it I know that it moves back and forth I seen a video that said it shouldn't do that idk I know I unplugged it and once I got to temp and hit third gear it started doing the same thing.

Mark helpful

Your Answer:

Related Questions

  • Loss power code 43 2 Answers

    Truck is throwing 43 code. Not the knock sensor, new cap button EGR solenoid,wires plugs, it's fine till third it will shift to third then bogs down and loses power, tries to die when stopping un...

    1994 GMC Sierra 1500 C1500 SLE Standard Cab LB

    -

    Maintenance & Repair

  • Spuddering loss of power 1 Answer

    From turn key the truck spudders high and low rpms and a loss of power

    1994 GMC Sierra 1500 C1500 SL Extended Cab LB

    -

    Maintenance & Repair

  • Motor loss power and skipping 2 Answers

    Was washing my motor with truck running had my spray turned to jet stuck the stream to my alternator trying to wash the oil off it truck shuts off runs like crap now real sluggish loss of power too...

    2001 GMC Sierra 1500 SL 4WD Extended Cab SB

    -

    Maintenance & Repair

  • Loss of engine power 2 Answers

    I changed my air filter and my 2009 gmc. Shortly after check engine light came on as well as loss or engine power. I changed it back but I still have the same problem.what did I do wrong?

    2009 GMC Sierra 1500 SLE Ext. Cab LB

    -

    Maintenance & Repair

  • rough idle, stalling, loss of power. 238 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

Own this car?

Share your experience with others.

1994 GMC Sierra 1500

Write a car review

Review another car

Shortcuts

Search GMC Sierra 1500 Questions

CarGurus Experts

  • #1
    yetilikesbeer
    Reputation
    12,360
  • #2
    dragonflyoffshore
    Reputation
    11,530
  • #3
    John Saffrahn
    Reputation
    11,450
View All

Know more, shop wisely

Search

Related Models For Sale

Used Ford F-150
6,071 Great Deals out of 134,778 listings starting at $1,500
Used GMC Yukon
656 Great Deals out of 11,616 listings starting at $1,499
Used Toyota Tacoma
1,987 Great Deals out of 33,740 listings starting at $2,990
Used Dodge RAM 1500
79 Great Deals out of 1,600 listings starting at $1,999
Used Chevrolet Tahoe
1,098 Great Deals out of 22,040 listings starting at $2,000
Used Chevrolet Camaro
591 Great Deals out of 9,115 listings starting at $4,289

Used Cars for Sale

2024 GMC Sierra 1500 For Sale
96 Great Deals out of 45,023 listings starting at $28,505
2023 GMC Sierra 1500 For Sale
276 Great Deals out of 4,483 listings starting at $31,688
2022 GMC Sierra 1500 For Sale
195 Great Deals out of 1,722 listings starting at $27,600
2021 GMC Sierra 1500 For Sale
327 Great Deals out of 4,123 listings starting at $19,000
2020 GMC Sierra 1500 For Sale
210 Great Deals out of 2,392 listings starting at $17,500

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.