Question about GMC Sierra

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I have a 1996 gmc sierra with the 3.4 v6 vortec and all of a sudden it woudnt start. I know the ignition is out of the question, i cheked the spark plugs and bought new ones. and the starter and fuel pump are good. There is smoke that comes out of the throttle body when i try to start it. We accidently put deisel in it but we cleared out the system added a fuel system cleaner and put 93 octane in the vehicle. We tryed adding an ounce of gas to the throttle body but still no start.

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  • GMC Master
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I have had to do this before, you need to take the spark plugs out and its going to take a lot of battery power so you may need to have a spare. you need to keep turning over the engine. until you can smell very rich fuel smell, the only other way is to remove and pressure clean the intake lines flush all fuel out, also you need to replace the fuel filter. you need to replace the fuel filter anyway. .

Posted on May 29, 2017

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Posted on Jan 02, 2017

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SOURCE: octane grade for a 2001 v6 gmc sierra 1500

93 but any will work

Posted on Mar 22, 2009

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SOURCE: 1997 gmc sierra will not run

sounds like a bad injector system there known for it

Posted on Sep 04, 2012

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1 Answer

96gmc Sierra 5.7 vortec won't start OBD codep 0700 have replaced almost every thing as far as fire and fuel pressure is good what you think


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Diagram of fireing oder of 4.3 V6 1996 chevy


Posted by original Asker under 2000 GMC New Sierra 1500 for a 1996 Chevy 4.3L V6

For the 1996 Chevy 4.3L V6:

Firing Order
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1-6-5-4-3-2

Cylinders:
........(back).......
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Let me now if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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Firing Order:
1-8-4-3-6-5-7-2

Cylinders:
.........(back).........
|...8...|........|...7...|
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|...4...|........|...3...|
|...2...|........|...1...|
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Distributor Connections:
............(back)
Coil--->o
6------->o........o<-------5
4------->o........o<-------3
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Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

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