Results 1 to 10 of 10

6.0 swap help

This is a discussion on 6.0 swap help within the LSx Retrofit and Swap forums, part of the LSx Technical Help Section category; I'm putting an lq4 6.0 into a 57 chevy truck. I hooked everything up today and im getting power to ...

  1. #1
    Junior Member
    Join Date
    May 2016
    Location
    Rock springs
    Posts
    3

    6.0 swap help

    I'm putting an lq4 6.0 into a 57 chevy truck. I hooked everything up today and im getting power to the fuel pump but nothing to the starter any ideas?

  2. #2
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Stock wiring harness? I presume you checked the relay?

  3. #3
    Junior Member
    Join Date
    May 2016
    Location
    Rock springs
    Posts
    3
    Yeah complete harness from the 2001 and i replaced the relay thinking that was the problem. but it wasn't. when you turn the key you can hear the fuel pump kick on but nothing when you turn the key to start

  4. #4
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    If you run a temporary jumper at the relay, will she crank over? Let me know if you need a schematic.

  5. #5
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,511

    Navy Blue Metallic
    98 T/A w/a little mods...

    If it is the original ecm I'm better it's looking for a BCM or VATS if they were not tune out.

  6. #6
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Yeah, there is an interconnection there. VATS usually kills the fuel pump though if I recall correctly.

  7. #7
    Junior Member
    Join Date
    May 2016
    Location
    Rock springs
    Posts
    3
    Where would you jump it at I guess I will need a diagram if you could thank you

    - - - Updated - - -

    It's the stock ecm and complete harness from the 2001 truck

  8. #8
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    Locate the starter relay in the underhood electrical panel which I presume you also swapped over. On our cars, the dark green wire is power to the coil in the relay, yellow/black is the ground for the coil which feeds from the BCM (Body Control Module -- this could be your issue), red is power to the switch side of the relay and purple is the other side of the switch to the starter solenoid. To jumper at the relay, you would use a length of wire to momentarily run power to the purple wire to see if the starter engages. Ensure that the vehicle is in park and the ignition is energized.

    Turning the key sends power to the relay coil, but the BCM has to also complete the ground circuit as power alone will not pull in the relay contacts. My guess, as noted above, is that the relay coil does not have a ground and that is why it will not engage the starter when you turn the key. You can probe the receptacles with the relay removed to test for power, ground and continuity to the starter solenoid. If it is in fact the ground that is missing from the equation, you can run a makeshift ground to that prong on the relay and the engine should crank over.

  9. #9
    Spaz is My Mentor SMWS6TA's Avatar
    Join Date
    Feb 2009
    Location
    Ugy Lower Corner of AL
    Posts
    10,511

    Navy Blue Metallic
    98 T/A w/a little mods...

    Quote Originally Posted by pajeff02 View Post
    Yeah, there is an interconnection there. VATS usually kills the fuel pump though if I recall correctly.
    IIRC it does the starter too. Depends on what year and car.

  10. #10
    Super Moderator
    pajeff02's Avatar
    Join Date
    Feb 2009
    Location
    Mansfield, PA
    Posts
    21,576

    Black & Blue
    '02 WS.6 / '07 Suburban

    ^^ Yes it does. I saw the interconnection to the BCM in the schematics last night. Looks like it would be an easy bypass though as you simply need to hook up a ground wire to the coil side of the relay.

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

Similar Threads

  1. Trans swap for swap
    By [CJ] in forum Drivetrain
    Replies: 0
    Last Post: 08-12-2011, 01:11 PM
  2. Engine swap and computer swap
    By mrmiatanut in forum Computer & Tuning
    Replies: 4
    Last Post: 09-08-2007, 06:10 PM
  3. To Swap, or not to swap, that is the question.
    By HasselZ28 in forum Camaro / SS
    Replies: 6
    Last Post: 08-11-2007, 08:58 AM
  4. Replies: 6
    Last Post: 01-30-2006, 02:02 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •