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tpi vacuum hose routing

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Old 10-22-2008, 09:26 PM   #1
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Car: 1989 IROC
Engine: 5.7
Transmission: 700R4
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tpi vacuum hose routing

Hey guys, i need some help, i did a search but i can't find a matching diagram for my car, 1989 5.7 tpi auto trans.I have a bunch of small vacuum hoses and a small black check valve and i'm trying to figure out the routing. one thing that is confusing me is that all of the diagrams i see show two lines comming from the egr solenoid but mine has a two into one connection. The only thing i'm sure of is that one hose goes from the pass. side on the rear of the plenum to the f/p reg.the rest of the connections such as the egr valve, the other small connection on the plenum,the connection underneath the throttle body and the check valve i have no clue. The previous owner tore all this apart so it's possible he has the wrong egr solenoid connection.
Thank's for your help.
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Old 10-23-2008, 03:21 PM   #2
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Car: 89 Firebird
Engine: 408
Transmission: 700r4
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Re: tpi vacuum hose routing

This site has various vaccum diagrams.
1989 Firebird
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