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Old 09-04-2014, 09:49 PM   #1
Quarterhorse636
 
Join Date: Aug 2014
Vehicle: 1990 Ford Mustang
Location: Missouri
Posts: 11
Default intermittent vacuum leak.. at least i think it is...

im not blowin but I put a boost gauge in my car to be able to watch my vacuum. ill start my car and it will stay at 14hg or so then when I hit a red light and sit for a couple minutes it will drop to 10hg and stay there until I turn the car off and back on and then it will go back up to 14 hg till I hit the next red light. what would cause the vacuum to drop so dramatically and suddenly? a diaphragm that uses the vacuum opening maybe?
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Old 09-05-2014, 07:50 AM   #2
88 orangepeel notch
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Join Date: Mar 2010
Vehicle: 1988 notchback
Location: Wisconsin
Posts: 1,883
Default

Fox/SN tech section please
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306 with all bolt ons, letter cam, ported E7's, T5 swap, full exhaust, 3:55's, 2" drop, and the worst paint you'll ever see or feel.
Dyno'd 300/316, 2745lbs-track scale
Best ET………12.4@108, 1.66 60ft on 8" ET Drags.
24 mpg (combined)
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Old 09-05-2014, 07:50 AM
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