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Old 11-05-2008, 03:52 AM
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Harness Camaro 1986 TPI to 1988 TPI

Hi,

I bought a Camaro 1988 with no motor on it , originally the motor is a TPI engine

I want to know if i use my 1986 harness , everything under dash is the same for 1988 ??

Just plug in and everything work ??

Thank you

Éric

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Old 11-13-2008, 06:18 PM
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It sure should. I think the only differences were when they went from MAF to MAP system. (no Maf sensor) Under the dash they should match up.
~Scott
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Old 11-14-2008, 01:18 AM
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NO!!! they won't. my expertise is with corvettes, not so much camaros. the tuned port MAF (mass air flow) and MAP (manifold absolute pressure)--they are very similar on both cars, that is MAP to MAP, MAF to MAF. MAP to MAF are completely different. just the computer maps vary between vettes and camaros. corvettes changed from MAF to MAP in 87 and cameros followed soon after. the wiring harness is different in respect to hooking up to the MAF and the MAP sensors, likwise, the ECM (the computer) is different and programed differently. one reads MAF info and one reads MAP info, which are completely different.

i think you said the car was an 86, stick with the MAF system. it is more tunable and more adaptable to mods, the MAP system is more rigid.

just as a side note, corvettes went back from the MAP system to the MAF system in the early 90s, why do you think they did that???
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Old 11-14-2008, 04:47 AM
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Quote:
everything under dash is the same for 1988 ??
I was refering to the two connectors under the dash that back feed for the dash cluster and pnk/blk power wires ect to the ECM.

That's the way I took his question. Since he has a engine/harness that match I'm prity sure the inside car dash/pwr harness will plug and play.

As always check the wire diagram and match up the connectors/colors to be sure.

I was not saying in anyway that a MAF/MAP system are interchangable.

~Scott
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Old 11-14-2008, 09:04 PM
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TPI camaros and firebirds were all MAF cars until 1989, 1990 is when they went to MAPs.

from 86 to 89, all TPI MAF thirdgens used the same ECM. the only difference was the PROM or the chip in the ECM.

the cold start valve was dropped in either 88 or 89.

there may be some changes in the MAF burn off setup.

the VATS system would be about the only major wiring addition for the 86~89 models.
i forget what year TPI thirdgens got VATS, but i believe it was 89.
if you have VATS, the ignition key has the little "chip" in the middle of it that is visible just above where the key is cut.
you can't use an ECM chip that is for VATS in a non VATS car.

this guy did a swap from the junk 85 system over to the 86~89 system, there may be some useful info there for you.
http://www.eecis.udel.edu/%7Edavis/z28/ecm_swap/
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Old 11-24-2008, 09:59 PM
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wiring issues

it might work for you but i tried to put a harness out of a 88 tpi camaro into my 86 tpi trans am so i could use the 88 distributor but my plugs under the dash were different and also had extra wires at the bulkhead connector if you cant get your harness to work i have one from the 88 camaro tpi it was a iroc but i need one for m 86 tpi trans am
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