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kilodawg's Avatar
 
Join Date: Oct 2004
Location: Florida
Posts: 1,735
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Vacuum advance disconnected - symptoms?

Long story but I'll try to condense it. '88 930 all original 47K miles.

Has been bogging down and stutters under load especially around 2.6K to 3K RPM's and dumps black smoke. When it gets past that point it clears up fine.

I noticed the other day that my vacuum advance line was disconnected. So today I connected it and went out for a test drive. All seemed well and it performed normally under boost until near the end of the drive when minor accelerations from 2k RPM's or so induced the hesitation and smoke again. Before that point the car had performed so well I thought that was my problem so I wondered if the line had come off again since I didn't feel I'd seated it completely. When I got home the line had in fact come off.

I had to end my drive for the day so I'm just wondering is there a chance this was the cause of my problem all along or just a coincidental side issue....

Thanks
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'73 914 2.0, '74 911 Coupe, '74 911 Targa
'78 924, '84 944, '86 944 Turbo, '84 911 Coupe
'84 944 (current), '96 993 Coupe (current)
'73 911T Coupe (current)
'88 930S M505 (current)
Old 11-09-2008, 01:19 PM
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Anybody?
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'73 914 2.0, '74 911 Coupe, '74 911 Targa
'78 924, '84 944, '86 944 Turbo, '84 911 Coupe
'84 944 (current), '96 993 Coupe (current)
'73 911T Coupe (current)
'88 930S M505 (current)
Old 11-10-2008, 02:47 AM
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Join Date: Jul 2003
Location: Back in B'ham, AL
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Those little hose, call vacuum lines, must be properly connected or in some instances plugged. Vacuum tightnesss is a major issue with 930's.
Old 11-10-2008, 10:45 AM
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Location: Birmingham, AL
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It's hard to imagine that little hose could cause enough of a leak to cause stumbling and black smoke... It usually has to be a much larger leak like an intercooler oring, etc...
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Old 11-10-2008, 11:39 AM
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