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#1 |
Registered User
Join Date: Oct 2020
Location: CHURCHVILLE NY
Posts: 472
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LS won't crank
Hi All, I am to the point on my 57 pickup project that I am getting ready to start it. This is a LQ4 DBW with 4L80E trans. I can communicate with the pcm with my tech 2 no coded stored but won't crank. Trans data shows it is in park and have power at the purple wire going out of the switch. There is a start relay and if I cross the big red to purple it cranks. The green wire on the start relay has power and if I touch the yellow wire on the starter relay it then cranks. I also am getting the 2 second fuel pump prime signal. I am really not ready to start it yet but trying to get everything in order when it comes time. Thank You Steve
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My 57 Fleetside C4 build. http://67-72chevytrucks.com/vboard/s...d.php?t=817054 |
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#2 |
Registered User
Join Date: Oct 2014
Location: Brandon, Manitoba, Canada
Posts: 974
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Re: LS won't crank
So no power to the start relay when the key is at Start position? You would have to work back from there. Do you have a neutral safety switch in that circuit?
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#3 |
Registered User
Join Date: Oct 2020
Location: CHURCHVILLE NY
Posts: 472
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Re: LS won't crank
Thank You it does have a neutral safety switch but it is a many wire connector and don't know which pins are for that but the pcm is seeing the car in park so it might be ok. I am going to call the business that sold me the engine/trans/pcm/harness setup to see if they can help. It will probably be something simple. Steve
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My 57 Fleetside C4 build. http://67-72chevytrucks.com/vboard/s...d.php?t=817054 |
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#4 |
Registered User
Join Date: Aug 2016
Location: El Cajon, CA
Posts: 275
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Re: LS won't crank
These threads may help you if it is the neutral saftey switch on the 4L80 trans. They are from when I was researching how to wire up my NSS.
http://67-72chevytrucks.com/vboard/s...d.php?t=845747 https://ls1tech.com/forums/conversio...l#&gid=1&pid=4 |
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#5 | |
Registered User
Join Date: Oct 2020
Location: CHURCHVILLE NY
Posts: 472
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Re: LS won't crank
Quote:
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My 57 Fleetside C4 build. http://67-72chevytrucks.com/vboard/s...d.php?t=817054 |
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#6 | |
Registered User
Join Date: Aug 2016
Location: El Cajon, CA
Posts: 275
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Re: LS won't crank
Quote:
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