94 GMC sierra starts and runs fine till it warms up then backfires shuts off and will not start again until it cools off and repeat??? I asked same question but about a 97 was told it was mass airflow

50

Asked by May 08, 2015 at 07:50 PM about the 1994 GMC Sierra 1500

Question type: Maintenance & Repair

12 Answers

125

Check vacuum lines leading from tbi to egr.. check egr operation and clean MAF.

125

Also, check the vac. line running to the maf as well. should come from the back side of the tbi to the maf.

68,295

Check the distributor control module,sound,s like it is getting hot and shutting truck off.

1 of 1 people found this helpful.
50

Already replaced DCM, ecm, fuel pump,fuelpump relay, coil

2 of 2 people found this helpful.
50

And computer has been replaced

1 of 1 people found this helpful.
68,295

Cataltic conveter replaced?

68,295

Or Crank sensor?

50

Catalitic converter isn't clogged and there isn't a crank shaft sensor on this truck so I've been told...is there one and if so where's it located

1 of 1 people found this helpful.
68,295

I reread that you replaced the ECM,check the igniton switch.

50

OK I will check ignition switch first thing in the morning... Thanks so much T_S_T...and I will keep you posted

1 of 1 people found this helpful.
50

When you say ignition switch you are referring to the actual key switch or is there something else called ignition

68,295

Yes,the key cylinder,good luck

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 65,452 nationwide Sierra 1500 listings starting at $1,995.

ZIP:

GMC Sierra 1500 Experts

  • #1
    dragonflyoffshore
    Reputation
    5,360
  • #2
    John Saffrahn
    Reputation
    3,700
  • #3
    Glenn Clingenpeel
    Reputation
    3,380
View All

Related Models For Sale

Used Ford F-150
2,318 Great Deals out of 183,060 listings starting at $1,000
Used Dodge Ram 1500
371 Great Deals out of 10,941 listings starting at $1,500
Used Toyota Tacoma
620 Great Deals out of 42,904 listings starting at $1,500
Used GMC Yukon
405 Great Deals out of 21,404 listings starting at $1,495
Used Chevrolet Tahoe
652 Great Deals out of 39,508 listings starting at $1,000
Used Chevrolet Camaro
417 Great Deals out of 30,789 listings starting at $3,550

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
81 Great Deals out of 30,285 listings starting at $18,625
2016 GMC Sierra 1500 For Sale
111 Great Deals out of 3,770 listings starting at $15,988
2015 GMC Sierra 1500 For Sale
133 Great Deals out of 4,833 listings starting at $17,898
2014 GMC Sierra 1500 For Sale
148 Great Deals out of 4,887 listings starting at $14,204
2013 GMC Sierra 1500 For Sale
76 Great Deals out of 2,049 listings starting at $8,450

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.