m.rob28

I just did an lq4 swap into my trans am and took out the ls1. I swaped over all accesories and all sensors. I'm also using the ls1 harness and ecm. When I went to start it there was no spark to any cylender. All it will do is just turn over. Does anyone have any idea what's going on? All the sensors that I swaped over from my ls1 to the 6.0 were all good. Thanks

LS1MCSS

iTrader: (18)

Did you remember to bolt on the ground wires to the back of the head?

m.rob28

Yes I did. There were 3 ground wires going to the back driver head and I did bolt on all 3

m.rob28

But that wasn't the problem. Anyone can help me?

m.rob28

The motor turns over but it won't start. There is no spark coming out of the coil packs, but I put got more coil pacs to see if it was thos and they new ones had no spark either... any help would be greatly appritiated

LS1MCSS

iTrader: (18)

Is there 12 volts going to the coil packs, on the pink wire?

m.rob28

Yes I was like 11.7v

68BBChevelle

iTrader: (12)

what did u end up finding on this issue? having same problem.

Redbull87

iTrader: (3)

Very possible the crank sensor or cam sensor isnt reading.if you have access to a obd2 code reader then plug it in and crank the car for a few seconds and it may give a code as to the problem.Id double check the crank sensor first...I had mine not plugged in all the way and did this exact issue.Good luck

68BBChevelle

iTrader: (12)

Ive got it throwing a p1336 code which is the crank relearn code.

Redbull87

iTrader: (3)

Sadly you may have to do a case learn procedure and that means towin the car to a nearby dealership or dyno shop.You need someone with hptuners or a tech2 to initiate the crank sensor learn.Right now the crank sensor is not correctly reading the reluctor and wont give spark to the plugs.I dont know of anyway to cheat a case learn code but search tech and maybe there is something that can be done.

99fbodyTA

Recheck your work and make sure you didn't miss anything first

68BBChevelle

iTrader: (12)

Talked to my harness guy i was losing power on my ignition relay while cranking soon as i added power to it fired rate up. He also said it should of ran with the crank learn code.

Redbull87

iTrader: (3)

Thats good to hear,hhow does she sound?Ill have to keep that in mind if the ignition voltage is low it will give a no spark condition.Glad it worked out for you

99fbodyTA

have you tried changing the crank sensor? i didnt research the 1336 code, but thats prob the source.

68BBChevelle

iTrader: (12)

Didnt have to mine is still good just the power in my relay was holding me out. I got her running and now shes not showing any codes.

68BBChevelle

iTrader: (12)

Thanks man. She sounds great, even better with the cutouts opened. I had voltage in the on position but none while cranking.

Redbull87

iTrader: (3)

Ahh the classic mix up of ignition wire hot during crank and accessory wire.Ive done it once before lol and chased it down after 2 days scratching my head.

11_silverado_noob

iTrader: (5)

which relay was it?

68BBChevelle

iTrader: (12)

It was ignition relay.