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1994 GMC 1500

Tiny
JHKNIGHT404
  • MEMBER
  • 1994 GMC TRUCK
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 260,000 MILES
I have a 1994 gmc 1500 with a 4.3L V6 it started running crappy the other day and in messing with it I have found that it only runs fine in reverse, in P, N, or and forward gears it spits and sputters and backfires and dies. Any suggestions?
Thursday, August 11th, 2011 AT 8:59 PM

11 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Go to this links: https://www.2carpros.com/articles/engine-backfires-while-running and https://www.2carpros.com/topics/engine-performance/backfires
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Thursday, August 11th, 2011 AT 9:31 PM
Tiny
JHKNIGHT404
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I understand all this but why would it run fine in reverse but not in any other gear?
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Thursday, August 11th, 2011 AT 9:37 PM
Tiny
RASMATAZ
  • MECHANIC
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Could be a problem with the transmission
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Thursday, August 11th, 2011 AT 9:57 PM
Tiny
JHKNIGHT404
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  • 11 POSTS
I don't think its the tranny its the engine lurching and spitting except when in reverse
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Friday, August 12th, 2011 AT 12:37 AM
Tiny
JHKNIGHT404
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Is there some sort of sensor that might cause this issue?
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Friday, August 12th, 2011 AT 8:33 PM
Tiny
JHKNIGHT404
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Am I going to get any help here or what?
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Saturday, August 13th, 2011 AT 5:09 PM
Tiny
RASMATAZ
  • MECHANIC
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Try disconnecting the TCC solenoid and see what happens
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Saturday, August 13th, 2011 AT 6:23 PM
Tiny
JHKNIGHT404
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Where is that located?
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Saturday, August 13th, 2011 AT 10:21 PM
Tiny
JHKNIGHT404
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  • 11 POSTS
Doesn't make a difference. Someone said to try the park neutral switch. Could that make the motor run differently in different gears?
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Sunday, August 14th, 2011 AT 1:01 AM
Tiny
JHKNIGHT404
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Where are all the gound straps on this model?
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Tuesday, August 16th, 2011 AT 2:24 PM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
No, I don't think the park neutral switch could be the problem. The TCC should be located on the side of the transmission. There is the main ground lead from the battery to the front of the engine. There should also be another one at the rear of the engine to the bulkhead.
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Tuesday, September 20th, 2011 AT 11:11 PM

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