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Old 12-30-2016, 09:58 AM
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I have a 1990 Chevy Suburban r1500 with a 350 motor
It blow a head gasket so we pulled the heads and replaced them. After getting it back together the ground wires at the back of the passenger side head started getting warm and smoking. So we checked to see if there were any wires pinched or caught were they weren't supposed to be. We didn't find any or anything that looked out of place.
Has anyone else run in to this problem or might have an ideal of what might be wrong
Old 12-30-2016, 10:46 AM
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The main battery ground (NEG) hooks directly to the engine block because the starter-motor draws over 300 amps when cranking. Assuming it cranks over OK, you probably have a bad ground connecting the engine-block to the body. There has to be more then just one small one on the cylinder-head. If you cannot find the issue, repost. I have a complete wiring diagram for a 1990 Suburban.
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Old 12-30-2016, 11:52 AM
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Was it smoking from ( or around) a small black plastic box on the passenger side firewall? .... If so, you most likely have a bad ground.
 
Old 12-30-2016, 12:28 PM
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It was a bad ground I forgot to thighted the main ground wire on the block.
I really feel stupid and am kicking myself in the back side now
Old 12-30-2016, 01:19 PM
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Glad you found your problem OP. Sometimes grounds get overloooked.
Don't feel bad....even the most experienced techs over look them.

Just make sure you don't draw over 300 amps while cranking....lol. That's too excessive on a 5.7L
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