Wiring harness help
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Wiring harness help
i have a 350 TPI and dont have the harness and the 350 is in a 86'Trans-am that was originaly a TPI car, can u use a iroc-z tpi harness from ECM to bulk head complete harness with all sensors on a trans-am 
Junior Member
Joined: Mar 2011
Posts: 35
Likes: 0
From: cove, texas
Car: 91 z28, 92 ZR1
Engine: LS1, LT5
Transmission: T56, ZF
Axle/Gears: 3.73/ 4.10
Re: Wiring harness help
ya should work battery and charcoal canister are on opposite sides though so you have to switch them around
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Re: Wiring harness help
so u would have to splice the battery and charcoal canister sensors and make them the length to fit
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Wiring harness help
No, they are not compatable.
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Re: Wiring harness help
so i would have to get a harness from a trans-am
Joined: Mar 2000
Posts: 5,703
Likes: 132
From: Orange, CA
Car: '90 Trans Am-12.45@110.71
Engine: 355 w/AFR 195's Elem. 400/430 HP/TQ
Transmission: Tremec T-56
Axle/Gears: 12 Bolt 3.73
Re: Wiring harness help
Yes, and the same year as yours.
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Re: Wiring harness help
but what if i have a 1989 motor with out the 9th injector and the distributor is also different from the earlier models
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Joined: Apr 2005
Posts: 7,736
Likes: 14
From: Not in Kansas anymore
Car: 82 Z28
Engine: 383 SP EFI/ 4150 TB
Transmission: T400
Axle/Gears: QP 9" 3.73
Re: Wiring harness help
You use a '89 prom in the computer ( same computer 86 - 89 )
There are wiring adapters available or you can make your own from junkyard parts to fit a remote coil dist into a HEI setup ;
or just get a HEI dist
There are wiring adapters available or you can make your own from junkyard parts to fit a remote coil dist into a HEI setup ;
or just get a HEI dist
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Re: Wiring harness help
can u use the '88 prom on the '89 motor ...i think ill stay with the remote coil ill just buy or get one from the junkyard
Thread Starter
Joined: Sep 2008
Posts: 700
Likes: 1
From: San Fernando valley-Lancaster,CA
Car: '86 TRANS-AM WS6
Engine: 1989 355 TPI L98
Transmission: TH700R-4
Axle/Gears: BorgWarner 9 bolt/ 3.27
Re: Wiring harness help
i also went to the jukyard and found a '85 trans-am tpi harness but was cut on the ecm side so i went to a '86 camaro tpi that had the connector for the ecm so i cut it so i can splice it with the '85 trans-am will this harness work with the '89 tpi 350 motor and ecm that i have or did i mess up
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