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1990 chevy K1500 timing


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rparks72's Avatar
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December 13th, 2012, 4:32 PM   #1  
1990 chevy K1500 timing

I hope someone can help me. I have a 1990 chevy K1500 pickup with a 5.7 liter. When I have the timing wire plugged up it will not run right, it misses terribly, shakes, will not rev up and will backfire. I can unplug the timing wire and it will run fine, wont miss and rev up fine. I have changed the distibutor, knock sensor, esc module, egr valve, map sensor, ecm, egr control module, wires, plugs, cap and button with the same results every time. Someone please help its my only vehicle.


Last edited by in2pro; December 13th, 2012 at 5:00 PM. Reason: added a more specific title to thread
 
kevinkpk's Avatar
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December 13th, 2012, 4:54 PM   #2  
Posted By: rparks72 I hope someone can help me. I have a 1990 chevy K1500 pickup with a 5.7 liter. When I have the timing wire plugged up it will not run right, it misses terribly, shakes, will not rev up and will backfire. I can unplug the timing wire and it will run fine, wont miss and rev up fine. I have changed the distibutor, knock sensor, esc module, egr valve, map sensor, ecm, egr control module, wires, plugs, cap and button with the same results every time. Someone please help its my only vehicle.
What is a timming wire? Can you be more explicite, or photo images?

 
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December 13th, 2012, 4:58 PM   #3  
Are you not using and inductive timing light, the kind that just clips over the jacket of the spark plug wire? If you are interrupting the spark to adj the timing then that is what is most likely causing the mis-fire

 
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December 13th, 2012, 5:09 PM   #4  
Posted By: in2pro Are you not using and inductive timing light, the kind that just clips over the jacket of the spark plug wire? If you are interrupting the spark to adj the timing then that is what is most likely causing the mis-fire
If thats the case, if he's not wearing heavy gloves, he's getting his a-- knocked off him.

 
Allan In NE's Avatar
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December 13th, 2012, 6:29 PM   #5  
Harmonic balancer has slipped, or the timing chain is WAY loose.

Allan

 
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