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09-11-2009, 07:48 PM
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#1
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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Need Help - 3.4 to LT1 wiring issues
Ok Lately ive converted a 3.4 firebird into a lt1. Evrything went smoothly but wiring for the 2 extra cylinders has me stumped. I ran the 5.7 harnes to the 3.4 harness to fire the 2 other injectors. But its still loading up the 7 & 8 cylinders. Please guys help me out. Thanks Rich.
Last edited by Czop418; 09-11-2009 at 07:48 PM.
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09-11-2009, 08:00 PM
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#2
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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What did you do? You still have the 3.4 engine harness? I'm confused
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 08:30 PM
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#3
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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Say what?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 09:10 PM
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#4
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Join Date: Dec 2004
Location: manchester, NJ
Posts: 1,775
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yea whaaa....? did you swap the entire engine harness??
__________________
97 Firebird Formula - 383LT1
15 Subaru WRX - 2.0L-turbo
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09-11-2009, 09:37 PM
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#5
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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I combimed a 5.7 engine harness into a 3.4 body harnes. And put in a lt1 ecu. And wired the last 2 cylinders into a hot so it would fire . But now 2 of the cylinders i belive 7 and 8 are loading up any suggestions to get past this ?
Last edited by Czop418; 09-11-2009 at 10:45 PM.
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09-11-2009, 09:39 PM
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#6
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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you used relays on injectors?
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 09:40 PM
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#7
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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Quote:
Originally Posted by Czop418
I combimed a 5.7 engine harness into a 3.4 body harnes. And put in a lt1 ecu. And wired the last 2 cylinders into a hot so it would fire then put them on a relay. But now 2 of the cylinders i belive 7 and 8 are loading up any suggestions to get past this ?
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How about a proper harness?
Relays to control injectors... wow.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 09:45 PM
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#8
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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Ok lt1 has 2 connectors going to the body harness and the 3.4 has 1. So i took the 2 combined it into 1 matched all the wires , for the 2nd connector had 1 wire in there that i found on all data to control the secondary injectors so i just added a power to kick them on to start the vehicle.
Last edited by Czop418; 09-11-2009 at 09:49 PM.
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09-11-2009, 09:46 PM
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#9
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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electrically what you did is wrong. relays are far too sloppy timing wise
You should have made the lt1 harness more or less stand alone
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 09:48 PM
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#10
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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What year PCM is it?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 09:50 PM
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#11
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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94 pcm with a 95 ecm.
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09-11-2009, 09:51 PM
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#12
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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And sorry for the typo we never tied it into a relay thought we did. My buddy did the wiring not me.
Last edited by Czop418; 09-11-2009 at 09:52 PM.
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09-11-2009, 09:52 PM
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#13
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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Quote:
Originally Posted by Czop418
94 pcm with a 95 ecm.
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Hmn, what?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 09:54 PM
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#14
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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do you mean BCM? you keep talking body harness
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 09:54 PM
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#15
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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the power control module is stock form the 94 3.4. Then we used a 5.7 95 Engine Control Module.
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09-11-2009, 09:55 PM
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#16
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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So how did you do all the pin outs?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 09:56 PM
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#17
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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All Data.
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09-11-2009, 09:58 PM
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#18
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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i think that your friend should step away from the wires.
did he try to integrate the two?
All data? you mean he looked at a diagram & started cutting & splicing?
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 09:59 PM
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#19
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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So you are using a LT1 PCM and parts of a 3.4 harness?
Why the relays?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 10:01 PM
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#20
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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Becuase have you EVER tried to replace a WHOLE BODY HARNESS. Its Probable atleast a 15 hr plus job. Now dont get me wrong i have the 5.7 harnes and worse case scenario i will put in the lt1 body harness. But im trying to see if theres ANY Possible WAY wiring wise that DONT HAVE TO DO THAT!
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09-11-2009, 10:02 PM
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#21
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,941
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I am so confused.
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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09-11-2009, 10:03 PM
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#22
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,170
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You don't need to replace a body harness. I guess I would have made the LT1 harness basically a stand alone harness. what does the body harness need to know, rpm? gotta be a way around that.
And yeah, I've rewired some cars.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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09-11-2009, 10:08 PM
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#23
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Join Date: Dec 2004
Location: manchester, NJ
Posts: 1,775
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the harnesses on f-bodies really arent that hard to do... its a big job... but... its better to do things right then Frankenstein up your car... i suggest you start ripping stuff apart and change the harnesses properly... way to much important stuff running to and from those harnesses to screw it up... just my .02 take it for what its worth... with that said... what is it with people trying to save a minute and doing stuff 1/2 asked... first the guy cutting holes in his floor and now this... good luck either way man
__________________
97 Firebird Formula - 383LT1
15 Subaru WRX - 2.0L-turbo
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09-11-2009, 10:13 PM
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#24
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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Ok Im going this explain this thoroughly and when you understand this Say OK.
Last edited by Czop418; 09-11-2009 at 10:57 PM.
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09-11-2009, 10:19 PM
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#25
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Join Date: May 2009
Location: Detpford New Jersey
Posts: 204
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Ok LT1 5.7 engine has 2 body harness conectors.
A Firebird 3.4 Has Has 1 Conector to body and Engine.
I took the 5.7 engine Harness Plugged Everything In But the Car would not start. So I recently found out , that it was not firing on 2 injectors becuase it was a 6 cylinder. So I went to All Data , I traced the wire diagram from the connectors , I found my main Power wire for the other 2 injectors. And I ran it into 1 connector. The car started started ran evenly but now when it gets up tempeature the cylinders load up. There were no cutting or splicing , I popped 2 wires out that was for a serial wire and the other injecor and pinned it into the other connector.
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