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After Cam, lifters Timing Chain and gears swap I get no fire. Any Ideas?

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After Cam, lifters Timing Chain and gears swap I get no fire. Any Ideas?

 
Old 06-11-2019, 08:35 PM
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jeff.james66
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Default After Cam, lifters Timing Chain and gears swap I get no fire. Any Ideas?

Due to some internal chirping from rear of my LS7 I decided to do some investigating. Ended up replacing Cam and lifters and since timing chain seemed very stretched and loose I replaced it and the gears too. This is a lot of work but I finally managed to complete the job today. But when I went to start the car today it turns over great and sounds good trying to start but there is no fire. I was careful about getting my timing marks set right and torquing everything to spec. I cant imagine why no fire.
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Old 06-11-2019, 09:11 PM
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sabastian458
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Check the ground at the back of the block/ pass side of the head
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Old 06-12-2019, 12:07 AM
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jeff.james66
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Thank you for the input. I have checked the ground at the rear of the block, It looks good. How good is an aluminum block as a ground though? Can a faulty Cam position sensor cause a no fire condition? The wires going to it look somewhat aged. Lots of heat in that area. Is there anything that has to be relearned if you swap timing gear?
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Old 06-12-2019, 07:34 AM
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Originally Posted by jeff.james66 View Post
Thank you for the input. I have checked the ground at the rear of the block, It looks good. How good is an aluminum block as a ground though? Can a faulty Cam position sensor cause a no fire condition? The wires going to it look somewhat aged. Lots of heat in that area. Is there anything that has to be relearned if you swap timing gear?
An aluminum block is plenty conductive to be a good ground.

Yes, a bad cam sensor could cause your problem. I would check all your electrical connections and the wiring going to the position sensor.
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Old 06-13-2019, 12:11 AM
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irok
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the car will still start with a bad cam sensor but causes long crank time to start.Are you sure you have installed correct cam gear?
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Old 06-13-2019, 04:10 AM
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Eric Fischer
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Originally Posted by irok View Post
the car will still start with a bad cam sensor but causes long crank time to start.Are you sure you have installed correct cam gear?
Agree with both of these. Have you pulled the codes from the PCM?
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Old 06-13-2019, 09:13 AM
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Was going to say did you get the correct timing set? There is two different ones and if you installed the wrong one this will happen. Can try unplugging cam sensor and see if it starts.
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