vaccuum/boost leak - TCCoA Forums
 
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post #1 of 5 (permalink) Old 09-21-2003, 09:54 PM Thread Starter
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vaccuum/boost leak

on the plenum leading into the intake manifold there is a 2 way brass fitting it has only one line leading to it. i cant find the other line and the diagram i got from the dealer shows it but not anything leading to it. I am only running about 7-8 pounds of boost because of it. any ideas

1990 SC AOD 1.7L AR....11.75 @118
441 RWHP 435 RWTQ
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post #2 of 5 (permalink) Old 09-22-2003, 10:29 AM
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One of the lines at that fitting goes to the vacuum distribution "tree" on the wheel well in the corner by the brake master cylendar, I think if that line was missing the car would really run like sh!t.
The second line goes to the back of the inlet plenum for the SC in called a crosstalk tube and is about 6-8 inches long. This is likely the one that is disconnected since some people have tried to eliminate the tube altogether with no performance increases.
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post #3 of 5 (permalink) Old 09-22-2003, 03:21 PM Thread Starter
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hey thanks for the advice traced it down and it was unhooked. car runs a ton better and actually have a decent brake pedal

1990 SC AOD 1.7L AR....11.75 @118
441 RWHP 435 RWTQ
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post #4 of 5 (permalink) Old 09-22-2003, 05:20 PM Thread Starter
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also was missing tube from intake tube to pcv valve the boost is back to where it should be now 10psi

1990 SC AOD 1.7L AR....11.75 @118
441 RWHP 435 RWTQ
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post #5 of 5 (permalink) Old 10-09-2003, 07:16 AM
 
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If you put a hose clamp on every vacumm line you can get to.And a plastic
tie on the smaller vac lines with nipples you will notice another gain in performance.
Try to put a clamp or tie on all the vac lines on the boost side of the vac line.
pcv valve lines ,ect.

randy
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