TBI Throttle Body Injection discussion and questions. L03/CFI tech and other performance enhancements.

1989 LO-3 vacumn line routing & timing questions

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Old Nov 25, 2006 | 11:50 AM
  #1  
Jproz1167's Avatar
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From: California
Car: 1982 Trans Am & 1982 Corvette
Engine: L-98 with LO-3 induction. 350 CFI
Transmission: 5 speed and vette has 700r4
Axle/Gears: 373's in T/A .. vette unknown
1989 LO-3 vacumn line routing & timing questions

where does the egr,map,air cleaner, get there vacumn from (what port on the throttle body) ? .... what is the vacum port that is screwed into the back of the intake for ? ..... anyone able to post a emmision vacumn line label for me ?

Timing book says set timing at 0 degrees but at that car barely runs. does pretty good at 6 degreesw though anyone know why ?
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Old Nov 25, 2006 | 12:19 PM
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From: Salt Lake City, Utah
Car: 1988 camaro "SS"/ 1991 305/T5
Engine: 383 LT1 in progress/LT1TBI 355 soon
Transmission: Probuilt 700R4 3600 stall/ T5
Axle/Gears: Moser axles, 3.42 Eaton Posi
Here's alittle help for you. From the front of the tbi unit from right to left goes like this. EGR,PCV,Thermac valve. The vacuum port on the back of the tbi unit goes to the map sensor. The screw in fitting on the intake manifold is used for both the cruise control and the HVAC controls. As far as timing goes i'm not the best person to answer that question. Did you tune the engine? If not you might need to look into that.
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Old Nov 25, 2006 | 08:20 PM
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From: Cincinnati, OH
Car: '90 RS
Engine: 377 LSX
Transmission: Magnum T56
Take a look at the "new to TBI" sticky that the top of this forum. There is an image that shows you where each vaccum line goes to.
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