LT1-LT4 Modifications 1993-97 Gen II Small Block V8

V6 to V8 swap

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Old 08-11-2011, 08:56 PM
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Default V6 to V8 swap

Just finished up swapping my 94 lt1 into a 96 v6 car. When i try to start the car all i get is a little click under the passenger side of the dash. I checked voltages everywhere and it all looks good. I can ground the starter out and it will crank. Any help?

Last edited by shix; 08-11-2011 at 09:49 PM.
Old 08-11-2011, 09:27 PM
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That happened to me and two wires were touching on the starter. Plus when I swapped to a 6 speed I forgot about the park/neutral safety switch that the autos have. Idk if that helps. It's got to be the wiring on the starter.
Old 08-11-2011, 09:30 PM
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ill take a look. i appreciate the response. any ideas are welcome.
Old 08-11-2011, 10:04 PM
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there's a starter relay under the passenger side kick panel that sometimes gets cranky/fails, I've also seen the plug that goes into the relay get loose and cause a similar issue. When you turn the ign to start power goes from the ign switch, to the relay, and then to the starter solenoid on the starter if I remember correctly.
Old 08-12-2011, 01:23 PM
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i got it figured out. wires were touching on the starter. Next problem is the fuel pump does nothing. Is there a relay for the fuel pump anywhere?
Old 08-12-2011, 01:30 PM
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Originally Posted by shix
i got it figured out. wires were touching on the starter. Next problem is the fuel pump does nothing. Is there a relay for the fuel pump anywhere?
The relay is under the drivers side kick panel on near the floor.
Old 08-12-2011, 02:28 PM
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going through double checking my wiring i came across this little guy. Anyone know where it goes?
Attached Thumbnails V6 to V8 swap-659682749_2358767043_0.jpeg  
Old 08-12-2011, 03:16 PM
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nevermind about the prime connector. now to check the relay.
Old 08-12-2011, 03:42 PM
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At the fuel pump relay connector i have voltage only on the red wire. I believe i should have voltage at the dark green/white wire with the key in the run position. Where can i get a wiring diagram for this?
Old 08-12-2011, 08:49 PM
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So heres what i did to the harness to make it match up to the 96 but i am unsure if the v6 car's wiring is the same. I repinned c210, c100, c220 and added c100 into my existing 94 engine harness so things would match the 96 body harness. The problem is fuel pump relay won't kick on when i try to start the car.

Last edited by shix; 08-12-2011 at 09:04 PM.
Old 08-13-2011, 01:05 AM
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There is a wire that comes from the PCM that needs to go to the Interior Connectors and it goes to that Relay.
Old 08-13-2011, 04:34 AM
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dark green and white wire on the white connector under dash on passenger side behind kick panel correct?
Old 08-13-2011, 01:16 PM
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Yup. On the LS Harness it'll be in the C-100 Connectors on the wheel well.
Old 08-13-2011, 02:13 PM
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All my connectors are correct. Still nothing out of the fuel pump. This is frustrating
Old 08-13-2011, 02:41 PM
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not to sound over simplistic, but is the IGN fuse in all the way?
Old 08-13-2011, 02:54 PM
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So you fuel pump wiring is getting no power?
Did you jupm the harness to make sure the pump works?
Old 08-13-2011, 02:55 PM
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yeah i can jump it and it works. all fuses are in all the way. everything is connected. I am stumped right now
Old 08-13-2011, 08:15 PM
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I wonder if i am missing a ground anywhere? Does anyone have any idea where i can get a wiring diagram for the engine bay and engine wiring harnesses?
Old 08-14-2011, 03:40 AM
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shoebox has the wiring diagram posted up.
There are also a couple grounds under the passenger and drivers kick panels
Old 08-14-2011, 05:37 PM
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verified all of my wiring and checked my connections. Tested the fuel pump relay. Checked my wiring again and still nothing.


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