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


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

Question type: Maintenance & Repair

12 Answers


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


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


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

1 of 1 people found this helpful.

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

2 of 2 people found this helpful.

And computer has been replaced

1 of 1 people found this helpful.

Cataltic conveter replaced?


Or Crank sensor?


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.

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


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.

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


Yes,the key cylinder,good luck

Your Answer

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 61,833 nationwide Sierra 1500 listings starting at $1,295.


GMC Sierra 1500 Experts

  • #1
  • #2
    John Saffrahn
  • #3
    Glenn Clingenpeel
View All

Related Models For Sale

Used Ford F-150
3,062 Great Deals out of 230,783 listings starting at $1,300
Used Toyota Tacoma
565 Great Deals out of 40,827 listings starting at $2,995
Used Dodge Ram 1500
312 Great Deals out of 10,752 listings starting at $1,950
Used Chevrolet Tahoe
831 Great Deals out of 40,285 listings starting at $1,900
Used GMC Yukon
493 Great Deals out of 19,463 listings starting at $2,800
Used Chevrolet Camaro
390 Great Deals out of 31,491 listings starting at $3,000
Used Ford Mustang
348 Great Deals out of 41,846 listings starting at $1,488

Used Cars For Sale

2018 GMC Sierra 1500 For Sale
9 Great Deals out of 30,014 listings starting at $22,639
2017 GMC Sierra 1500 For Sale
80 Great Deals out of 5,697 listings starting at $20,999
2016 GMC Sierra 1500 For Sale
112 Great Deals out of 3,463 listings starting at $14,500
2015 GMC Sierra 1500 For Sale
180 Great Deals out of 5,679 listings starting at $13,500
2014 GMC Sierra 1500 For Sale
191 Great Deals out of 4,261 listings starting at $9,995

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.