1994 GMC 1500

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

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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Friday, August 12th, 2011 AT 8:33 PM

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

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

JHKNIGHT404

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Where is that located?

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Saturday, August 13th, 2011 AT 10:21 PM

JHKNIGHT404

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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

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

RIVERMIKERAT

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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