Thread: 2003 3.1L Fuel Injector Wiring Harness / No Start

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  1. #1 2003 3.1L Fuel Injector Wiring Harness / No Start 
    peon
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    Default 11-24-2014
    I'm having a no start issue and narrowed it down to the Fuel Injector plug harness. I was looking for a wiring diagram for that harness and/or the plug specifically. I think A-H is all the Injector signals but I'm trying to figure out which signal would kill my Tach and not fire the Injectors. I can wiggle the harness by the plug and all works but I need to find the bad hot or ground. I think the opposite side of the plug is the CPS and the MAP sensor but I can't find anything on the Green and Grey wires. Thanks for any help.

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  2. #2 Re: 2003 3.1L Fuel Injector Wiring Harness / No Start 
    Scottydoggs
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    Default 11-24-2014
    id start with taking that tape off them wires, if they are or have been spliced they could be the issue.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  3. #3 Re: 2003 3.1L Fuel Injector Wiring Harness / No Start 
    peon
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    Default 11-25-2014
    The tape just covers a bare spot in the wire. I checked it out and it appears to be ok.
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  4. #4 Re: 2003 3.1L Fuel Injector Wiring Harness / No Start 
    peon
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    Default 11-25-2014
    To follow up the wires going to the CPS was the problem. Melted together. Took upper intake off and removed plug. Cut bad section out, soldered, heat shrink, and back in business.
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  5. #5 Re: 2003 3.1L Fuel Injector Wiring Harness / No Start 
    Scottydoggs
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    Default 11-25-2014
    a bare spot is not ok.

    what happens is air gets to the wire, then kills the wire. when that happens you get whats known as dry wire, basically the copper wire is now tarnished and no longer can flow a strong currant through that part of the wire.

    so its best to just cut that wire where the bare spot is, then strip the wires back till you get clean shinny copper wire on both cut ends, then solder and shrink tube the connection. so its air and water tight.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #6 Re: 2003 3.1L Fuel Injector Wiring Harness / No Start 
    Scottydoggs
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    Default 11-25-2014
    Quote Originally Posted by peon View Post
    To follow up the wires going to the CPS was the problem. Melted together. Took upper intake off and removed plug. Cut bad section out, soldered, heat shrink, and back in business.

    you ninja'd me there. good job lol

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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