C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

89 TPI plenum

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Old May 27, 2007 | 09:33 AM
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Default 89 TPI plenum

I pulled the plenum off my 89. what sensor is under there?
also, where can I get all the little O-rings that come off with the fuel rail?

I want to replace everything while I am in there..

thanks.
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Old May 27, 2007 | 10:34 AM
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That is the MAT sensor (manifold temp) and I just reused mine. They rarely go bad. The fuel line o-rings I think I got from Superior Chevy 800 728-8267 Chris, they were fifty cents each.
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Old May 29, 2007 | 01:19 PM
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I just changed the injectors on my 89 this past weekend. The only fuel rail O-rings I could get at the dealer were for the fuel line connectors on the front of the engine. The other ones were only available as a kit, which GM no longer sells. I was referred to http://www.vintageparts.org/ and was able to purchase the Delco kit there (seriously way overpriced).

The fuel injector O-rings you can get from The Last Detail.
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Old May 29, 2007 | 01:54 PM
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The Felpro intake manifold gasket set comes with the 2 o-rings for the fuel lines (as well as all the runner/plenum gaskets, distributor gasket, injector o-rings, throttle body gaskets etc) but it does not come with the o-rings needed to disassemble your fuel rail (not that you need to..I didn't)
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