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

40

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

Question type: Maintenance & Repair

12 Answers

55

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

55

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

60,015

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

40

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

1 out of 1 people think this is helpful.
40

And computer has been replaced

1 out of 1 people think this is helpful.
60,015

Cataltic conveter replaced?

60,015

Or Crank sensor?

40

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 out of 1 people think this is helpful.
60,015

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

40

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

1 out of 1 people think this is helpful.
40

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

60,015

Yes,the key cylinder,good luck

Your Answer

Add photo

Related Questions

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 58,736 nationwide Sierra 1500 listings starting at $1,599.

ZIP:

Search GMC Sierra 1500 Questions

UK Questions

Are you a UK consumer? CarGurus now has a discussion forum in the UK.

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,610
#2 John Saffrahn
John Saffrahn
Reputation 3,230
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 2,890
View All

Related Models For Sale

Used Ford F-150
3,217 Great Deals out of 205,088 listings starting at $1,779
Used Dodge Ram 1500
528 Great Deals out of 13,262 listings starting at $1,800
Used Toyota Tacoma
712 Great Deals out of 32,122 listings starting at $2,000
Used GMC Yukon
563 Great Deals out of 16,647 listings starting at $2,500
Used Chevrolet Tahoe
852 Great Deals out of 28,370 listings starting at $1,700
Used Chevrolet Camaro
475 Great Deals out of 39,921 listings starting at $3,499
Used GMC Sierra 2500
189 listings starting at $7,500

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
14 Great Deals out of 30,701 listings starting at $23,800
2016 GMC Sierra 1500 For Sale
59 Great Deals out of 4,839 listings starting at $20,990
2015 GMC Sierra 1500 For Sale
172 Great Deals out of 4,386 listings starting at $16,489
2014 GMC Sierra 1500 For Sale
180 Great Deals out of 4,459 listings starting at $13,000
2013 GMC Sierra 1500 For Sale
113 Great Deals out of 2,537 listings starting at $9,988