glad your passing thought and not something else
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| strange vacuum readings http://4g61t.org/forum/viewtopic.php?f=6&t=15807 |
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| Author: | nodents [ Sat Nov 12, 2005 11:59 am ] |
| Post subject: | strange vacuum readings |
This has been happening for a long time, just never posted about it. Sometimes vacuum will be good, 12-15 @ idle, dropping to 19-20 when decelerating in gears. Then if car is shut off and restarted it will change to only 6-9 @ idle and 12-15 decel. or so. Or if restarted will go back to normal or vice versa. Doesn't seem to change hot or cold. Have chacked for boost leaks. Throttlebody seals? Anybody else got this symptom? |
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| Author: | Flying Eagle [ Sat Nov 12, 2005 4:36 pm ] |
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Have you tried an alternate quality gauge to corroberate this phenomenon as being related to the car and not the test equipment? Passing thought.... |
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| Author: | nodents [ Sat Nov 12, 2005 7:08 pm ] |
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glad your passing thought and not something else
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| Author: | unior [ Sat Nov 12, 2005 8:54 pm ] |
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make sure the signal line to the gauge isn't pinched, torn, collapsing under vacuum, etc. I had a cheap rubber vacuum line running to a gauge before that had a pinhole that wouldn't leak until you made enough boost or vacuum to cause it to pull air through the tiny hole. also...would EGR affect vaccuum readings? just throwing out ideas |
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