Yellow/Orange spark at coil
06-23-2008, 12:18 PM
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Car: 1984 T/A
Engine: 5.7L TPI
Transmission: 700R4
Yellow/Orange spark at coil
Hi again guys!
I think I've found a major component in my fuel mileage/miss at idle problem. I hooked a spark plug into the distributor end of my coil wire, and had someone crank the motor a few times. The spark was yellow/orange instead of blue/white. This coil was new 1500 miles ago (although cheap). I swapped the coil with an original gm coil my dad had lying around. Same thing. What are your suggestions? Should I check wiring or just buy another new coil?
I think I've found a major component in my fuel mileage/miss at idle problem. I hooked a spark plug into the distributor end of my coil wire, and had someone crank the motor a few times. The spark was yellow/orange instead of blue/white. This coil was new 1500 miles ago (although cheap). I swapped the coil with an original gm coil my dad had lying around. Same thing. What are your suggestions? Should I check wiring or just buy another new coil?
06-24-2008, 09:34 PM
#2
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Join Date: Mar 2005
Location: Missoula Montana
Posts: 59
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Car: 1984 T/A
Engine: 5.7L TPI
Transmission: 700R4
Re: Yellow/Orange spark at coil
So I did the 3 part coil test listed in the chiltons manual, my newer coil passed all three. I also did the coil winding continuity test. All terminals came out to 8.5 ohms. So the coil is good right? Where do I go from here?
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