89 350 tpi. will an 87 350 tpi harness work?
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Joined: Jun 2010
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From: Owatonna, MN
Car: 1989 Pontiac GTA/2007 TrailblazerSS
Engine: 350 L98/LS2
Transmission: 700-R4/4L70E
Axle/Gears: 3.27/4.10
89 350 tpi. will an 87 350 tpi harness work?
i need a new wiring harness for my 89 350 tpi. there is a harness available, but that's from an 87. will everything still work?
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Joined: Sep 2000
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From: So.west IN
Car: 87 Formula/ 00 Xtreme
Engine: TPI 305/ v6
Transmission: struggling t-5/ 4l60E
Axle/Gears: 3.08/ 3.23
Re: 89 350 tpi. will an 87 350 tpi harness work?
I can't remember offhand if 89 was the years GM switched from MAF to S/D.
The harnesses will be similar but, not the same even if it is MAF. The fan (temp switch) wiring changed slightly '88+ and the A/C pressure fan request changed slightly along with the wire colors to them.
'87 uses a different style (shape) relay from '89, also.
No 9th injector for '89.
ECM pinout from MAF to S/D is slightly different and obviously, the ECM is different as well.
That's about all I can think of.
The harnesses will be similar but, not the same even if it is MAF. The fan (temp switch) wiring changed slightly '88+ and the A/C pressure fan request changed slightly along with the wire colors to them.
'87 uses a different style (shape) relay from '89, also.
No 9th injector for '89.
ECM pinout from MAF to S/D is slightly different and obviously, the ECM is different as well.
That's about all I can think of.
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