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Old 10-24-2011, 06:08 AM
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Looking for a Wiring Diagram TPI 350

Hi everyone, I am currently in the process of replacing the destroyed carb'd 350 in my 84 Z28 with a TPI 350 from an 87 Iroc, It is a Mass Air engine, the wiring came seperate from the engine and I am having trouble figuring out what goes where, some of the wires are self explanatory and Chevythunder.com has been a big help for a lot of it but the pictures they have on their website are small and copyrighted so I can't enlarge or cut and paste them. Can anyone steer me in the right direction? I need to get the car running again so I can have room in the garage for the next project, Thanks in advance
~Justin



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Old 10-24-2011, 06:57 AM
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Hypersnap will help w/enlargement, etc. Just can't legally repost then, though.

What specifically are you having a problem with?

AutoZone has a lot of different wiring diagrams, an example is- http://www.chevytalk.org/fusionbb/sh...hp?tid/241136/

Some links that might have something useful:

http://www.hotrodlane.cc/ONLINETECH/tpitechpage.html
http://www.rowand.net/Shop/Tech/GMTPISwap.htm

Last edited by cobalt327; 10-24-2011 at 07:10 AM.
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Old 10-24-2011, 07:26 AM
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I'm trying to lay out the harness and the problem is I seemto have extra connectors for fuel injectors, I figured since I have the cold start injector I should have 9 but it seems I have 10 connectors which throws me off when trying to hook things up, since I'm not sure which side goes where. It is an original harness as well so I don't have the luxury or the wires being labeled. Some of the connections are dummy proof like the Alternator, MAF and coolant sensors, knock sensor, etc. but there's so many wires I don't know what ones I actually need and which I don't. I would like to get the car wired with just what I need and then I will remove any excess wires.
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Old 10-24-2011, 08:33 AM
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Other than the driver side cold start injector, like you say- there should be only eight injector plugs.

http://www.thirdgen.org/techboard/tp...nstalling.html is a thread that ID's various and sundry plugs on the TBI harness. Odd that you have 9 plugs for the injectors, though. The "extra" is identical to the others? Any chance it's a "test" plug"?
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Old 10-24-2011, 10:41 AM
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Could someone have added one as a test wire perhaps?

I'll see what I can find when I get home.
I have the Haynes manual for the Trans Am.
I can snap some pics and email them to you if you like.
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Old 10-24-2011, 12:21 PM
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Maybe there is something here in Electrical,Third Gen Technical Articles


Sorry "Cobalt" I missed your reply.
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Old 10-24-2011, 12:36 PM
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Not at all- that's a WAY more complete link, I just bookmarked it myself, thanks!
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Old 10-26-2011, 06:20 AM
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A cold start sensor plug maybe? I'm still looking I actually took a look at a friends TPI Vette yesterday and the sensor that plugs in next to the temp sensor in the front of the intake manifold seems to be what I'm looking at, thanks for all the replies, I am an active ThirdGen.org member and usually get great responses from there but lately I haven't seen alot of action over there. Thanks again
~Justin
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Old 10-26-2011, 09:42 AM
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It's been awhile, but a few years ago I did a swap on an 87' era TPI into a 66 GMC. Feel free to post more photos and questions and hopefully my memory will kick in and help you out. If you'd like my email, feel free to PM me for help. However, if its tech related, it would be great to still post here so others can get the benefit of lessons learned.
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