Standard Vacuum?
04-12-05, 07:17 AM
#1
Trying not to be stock
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Standard Vacuum?
What is the standard vacuum that I should be seeing when my car is at idle? Just did a temporary hookup for my boost gauge cuz my car keeps stalling out. it'll stay right around 18 for the vacuum side then drops down towards 10 when the car is about to stall out. Put the car in the shop and the guy didn't fix anything...
04-12-05, 07:26 AM
#3
Racing Rotary Since 1983
iTrader: (6)
18 is excellent w regard to idle vacuum.
you will need to provide more info than "stall out" to get help...
does it stall out in neutral? or when you start to move under power?
howard coleman
you will need to provide more info than "stall out" to get help...
does it stall out in neutral? or when you start to move under power?
howard coleman
04-12-05, 07:28 AM
#4
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It won't start up hardly at all...keeps turning over but no start, then when it finally does start I have to rev it to 4-5 grand and even then it'll cut out with throttle.
04-12-05, 07:29 AM
#5
Racecar - Formula 2000
16-20 inches is normal for a stock engine. If it is ported, it could be somewhat lower. Is the cold start mechanism (thermowax) disabled or broken? Do a search - there are lots of threads on this.
04-12-05, 07:30 AM
#6
Racecar - Formula 2000
REVZEMPOE,
Actually, your last symptom sounds like a vacuum leak (disconnected hose or similar...)
Actually, your last symptom sounds like a vacuum leak (disconnected hose or similar...)
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04-12-05, 07:34 AM
#8
04-12-05, 07:46 AM
#9
Originally Posted by howard coleman
most probable from your further info is vacuum leak... check the hoses and especially the hose to the MAP sensor near the oil filter on the firewall. howard coleman
FWIW, I'm seeing 16 to 17 in/Hg @ idle on my stock engine (w/70k).
Last edited by Sgtblue; 04-12-05 at 07:50 AM.
04-12-05, 09:03 AM
#10
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I know the map sensor 
that hose is in fine. Oh and I definitely can tell when that hose is off, black smoke comes out horrible idling. But with my current problem, it's only when the engine is cold. Once it's warmed up it idles and starts fine....everything runs well (other than the fact I only get 6 psi of boost from the turbos)
that hose is in fine. Oh and I definitely can tell when that hose is off, black smoke comes out horrible idling. But with my current problem, it's only when the engine is cold. Once it's warmed up it idles and starts fine....everything runs well (other than the fact I only get 6 psi of boost from the turbos)
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