no spark after replacing head gaskets
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From: Aloha, Oregon
no spark after replacing head gaskets This is the first time I''ve ever had a problem after opening a motor where I cannot get a spark. I just replaced the head gaskets on my 389 LS6 stroker in my 2001 C5. All back together, everything plugged in, fluid in, etc. Engine only cranks and there is fuel, but no spark. Wont fire. I have triple checked all connections and fuses. No codes. I never had the cam or crank sensor unplugged. However, in the course of the repair there were times when the harnesses had some strain on them as I would manuver them out of the way. Also, I steam cleaned the motor at the half way point. I did make some effort to ensure all sensor connectors were dry and clean. I would think if i had a bad connection that I would get some code. Or, have I cooked the PCM somehow? If anyone has experienced these symptoms, please chime in. thanks.
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Originally Posted by 2xLS1
F-bodies have ground wire lugs that bolt to the back of the heads that if are not connected, will cause that. Not sure about vettes, bit it's something to check.
Hey Robert!
joel
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Originally Posted by binksz06
Vettes are the same - left head/bank.
Hey Robert!
joel
Hey Robert!
joel
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I believe there are three wires going to each coil. It has been awhile, but I'm pretty sure.
One is a 12v source
One is a Constant ground
One is a ground trigger from the PCM
Take a multimeter and make sure they are getting power. The pink wire on the connector should be getting constant 12v is my memory serves me correctly. I would imagine the key has to be on to see power, but my ls1 is in a rx7 I'm not sure how you're cars are.
Also check the ground as other's have mentioned. There's another connector that goes into the harness that supplys power to the coils. I'm not sure where this is on your car ( I cut it out of my harness and rewired it) but if you unhooked it that could be another possibility.
One is a 12v source
One is a Constant ground
One is a ground trigger from the PCM
Take a multimeter and make sure they are getting power. The pink wire on the connector should be getting constant 12v is my memory serves me correctly. I would imagine the key has to be on to see power, but my ls1 is in a rx7 I'm not sure how you're cars are.
Also check the ground as other's have mentioned. There's another connector that goes into the harness that supplys power to the coils. I'm not sure where this is on your car ( I cut it out of my harness and rewired it) but if you unhooked it that could be another possibility.
