Question about 1991 GMC C1500

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Firing Order Diagram

I need to get a firing order diagram for 1991 GMC V6 1500 I was changing the spark plugs and mixed up the firing order!!! HELP...

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  • Anonymous Nov 12, 2008

    i need the diagram so i can put the wires back on

  • gutterboy Apr 20, 2009

    I have a 1989 chevy pickup with a 350 motor in it . pulled the motor out of a running truck and mixed up the spark plug wirers on top of the distibutor cap can you help me.

  • Anonymous Mar 15, 2014

    was changing wires and got a couple mixed up don't know where they go

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The firing order is
1-6-5-4-3-2

Posted on Aug 06, 2008

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The firing order start as 1-8-4-3-6-5-7-2 because the 350 is a 8 cylinder, now to start the number 1 you have to place the timing mark to 0 with the number 1 in end of compression(piston up remove spark plug to see).then remove the cap distributor the rotor will point to cyl 1 and you have to start a little bit to see which way the rotor turn clockwise or counter clockwise. then start 1-8-4-3-6-5-7-2

Posted on Aug 23, 2013

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1 Answer

I mixed up my spark plug wires i changed the distributor cap and rotor and spark plug wires but i mixed them up can any one help me


You can google the engine size and "firing order" to get a drawing or photo of the firing order online.
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It can be faulty or dirty spark plug itselfd.Also for reference get the fuel level checked.Is the fuel tank is empty or near to empty.
Try cleaning the spark plugs and then see if that is helpin.On some cases the black carbon layer gets collected on the spark plugs and that causes the problem,so cleaning the plugs help.But if its not helping,then spark plug has to be replaced.Spark plugs get power from ignition coil to ignite sparks.If ignitioncoils are faulty then also there will no spark.--------------

To troubleshot and confirm the issue,i suggest you to go through the help links provided below,check the procedure and it will help you to confirm the issue in your case.
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Click the link below:------

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http://howtobyme.blogspot.com/2011/12/car-crankshas-spark-but-will-not-start.html


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http://schematicsdiagram.blogspot.com/2011/06/spark-plug-firing-order-for-car.html

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http://schematicsdiagram.blogspot.com/2011/07/how-to-replace-spark-plugs.html


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http://schematicsdiagram.blogspot.com/2011/08/how-to-perform-basic-engine-tune-up_01.html


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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wires-go-on.html

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http://schematicsdiagram.blogspot.com/2011/12/how-does-spark-plug-wire-go-on.html

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http://whoisbyme.blogspot.in/2012/06/ford-plug-wires-not-coming-out.html

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http://technoanswers.blogspot.in/2012/02/chevy-impala-spark-plug-firing-order.html

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These details will help.

Thanks.

Nov 26, 2012 | Cars & Trucks

1 Answer

We changed spark plugs & wires on our 1991 GMC & seem to have the order wrong on the distributor cap because truck won't start. need diagram


Here is the firing order diagram for the 5.0 liter (305), 5.7 liter (350) and the 7.4 liter (454) V-8 engines (note position of locking latches/screws between the 3 and 6 and the 1 and 2 terminals on the distributor cap). Let me know if you need the 4.3 liter V-6 engine diagram (hopefully not in a 2500 series truck) or if you require any further assistance.




zaraki_35.jpg

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2 Answers

Firing order for Spark Plug wires


Here is the diagram you ask for. While it says it is for the 3.0L V6, it is the same for the 4.0L V6 if that's what you have...


2627ab5.jpg

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991 Chevy S10 firing order
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