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Join Date: Dec 2006
Location: Chalfont, PA
Posts: 93
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Bouncing tach?
Hey,
The tach on my 74 bounces quite a bit. It just seems to take a min to "catch up" when you really hammer on it. It makes it difficult to read especially when you get on it in the lower gears. Any suggestions? Thanks, Pat
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'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff. |
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12-06-2006, 07:48 AM
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I seem to remember this being a symptom of dirty points. You might check your points and make sure the contacts are clean. Might be an easy fix.
Mike
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Mike 1976 Euro 911 3.2 w/10.3 compression & SSIs 22/29 torsions, 22/22 adjustable sways, Carrera brakes |
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12-06-2006, 08:08 AM
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Join Date: May 2004
Location: San Antonio, TX
Posts: 2,466
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I believe that symptom is common to a failing voltage regulator.
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1972 911T 1972 911E "RSR" |
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12-06-2006, 08:50 AM
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Mine started bouncing just as the alternator died.. Replaced the alternator and problem went away! Mine had teh intergrated voltage regulator, so hopefully it is that easy?
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Vance '83 SC Cabriolet - The "Matrix" '73 914 - "Spicy Mustard" - SOLD |
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12-06-2006, 08:54 AM
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Join Date: Jul 2002
Location: Pollock Pines,Ca.
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I second the point's responce. Could be dirty or just have a weak spring.
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12-06-2006, 08:57 AM
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Join Date: Oct 2006
Location: MYR S.C.
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put a multimeter on the battery, record if it has the option.
my brothers tach was acting up, voltage was jumping to 17v!
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86 930 94kmiles [_  _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-06-2006, 09:10 AM
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Join Date: Dec 2006
Location: Chalfont, PA
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Was the voltage jumping when he revved it? I'll give it a try this evening. Thanks
Pat
__________________
'74 911 options delete no sunroof. lowered, swaybars, tie bar, braided brake lines, corner balanced, "s" gauges, 993tt seats, Momo wheel and knob, 993 mirrors, blacked out window trim, H4's, short gearing, S pistons, stand alone EFI, other stuff. |
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12-06-2006, 09:12 AM
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Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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when the tach was jumping so was the voltage
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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12-06-2006, 01:10 PM
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1976 Porsche 911
1983 Porsche 911 SC Cabriolet 3.0
