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

85

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

85

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

62,225

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.
62,225

Cataltic conveter replaced?

62,225

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.
62,225

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

62,225

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 64,410 nationwide Sierra 1500 listings starting at $1,500.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 4,850
#2 John Saffrahn
John Saffrahn
Reputation 3,440
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,020
View All

Related Models For Sale

Used Ford F-150
2,409 Great Deals out of 209,425 listings starting at $895
Used Dodge Ram 1500
428 Great Deals out of 11,401 listings starting at $700
Used Toyota Tacoma
527 Great Deals out of 37,484 listings starting at $2,950
Used GMC Yukon
392 Great Deals out of 16,276 listings starting at $1,800
Used Chevrolet Tahoe
602 Great Deals out of 27,562 listings starting at $600
Used Chevrolet Camaro
132 Great Deals out of 35,283 listings starting at $1,995
Used GMC Sierra 2500
3 Great Deals out of 161 listings starting at $2,400

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
29 Great Deals out of 38,902 listings starting at $21,410
2016 GMC Sierra 1500 For Sale
80 Great Deals out of 3,792 listings starting at $17,995
2015 GMC Sierra 1500 For Sale
128 Great Deals out of 4,039 listings starting at $14,799
2014 GMC Sierra 1500 For Sale
133 Great Deals out of 4,351 listings starting at $14,495
2013 GMC Sierra 1500 For Sale
75 Great Deals out of 2,257 listings starting at $8,096