TPI plenums any differance 85-92
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Joined: Dec 2000
Posts: 437
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From: Jacksonville ,Fl
Off the top of my head, in 88 or 89 the lines on the top got shorter, about that time the cold start hole dissappeared. In '90 they got a port for the MAP sensor. I think you can fairly easily use any plenum on any year with some simple modifications.
Senior Member
Joined: Jul 1999
Posts: 994
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From: San Diego, CA
85-88 are all the same. IAC inlets at front of plenum, and cold start injector passages.
89 - the IAC inlets blocked off front of the plenum. Also, cold start injector passaged was eliminated on the driver side.
90-92 Same as 89, but add a MAP sensor boss over by the fuel pressure regulator.
Purely cosmetic - 89 and later received the shorter grooves on top.
89 - the IAC inlets blocked off front of the plenum. Also, cold start injector passaged was eliminated on the driver side.
90-92 Same as 89, but add a MAP sensor boss over by the fuel pressure regulator.
Purely cosmetic - 89 and later received the shorter grooves on top.
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