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Registered
Join Date: Sep 2004
Posts: 73
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Erratic Tachometer
Perhaps some one of you has had a similar problem. I have a 1984 Carrera and recently am experiencing intermittent tachometer bouncing. Initially the tach would jump to a higher rpm but now pegs. When I rev the engine it drops below the red line. Perfectly fine yesterday but problem again today. Suspicious that it is a poor ground but I did check fuses to make sure they were all seated well and making contact. When the tach is working properly it is spot on so I don't suspect the tach but could be wrong. Would appreciate your input. Thanks
Al |
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08-27-2006, 10:32 AM
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Join Date: Dec 1999
Location: TX USA
Posts: 9,804
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While it could be a bad ground ... I suggest monitoring the system Voltage to see if normal, high, or eratic, and if any fluctuations match when the tach goes erratic.
Traditionally, an erratic tach is a sign of Voltage regulator problems.
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Warren Hall, Jr. 1973 911S Targa ... 'Annie' 1968 340S Barracuda ... 'Rolling Thunder' |
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08-27-2006, 10:43 AM
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Join Date: Sep 2004
Posts: 73
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Tach
Ah ha, thanks, will do.
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08-27-2006, 10:53 AM
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Join Date: Jul 2002
Location: Southern California
Posts: 5,067
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You probably shouldn't drive the car too far from home until you figure out the problem...if it's a bad VR the battery may soon fail, leaving you stranded. Ask me how I know...
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1984 Targa |
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08-27-2006, 12:29 PM
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Join Date: Jul 2003
Location: Back in B'ham, AL
Posts: 3,459
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Early - s- man is right again!
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08-27-2006, 02:58 PM
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Join Date: Sep 2004
Posts: 73
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Thanks
Thanks for your input. I've decided to not drive until wringing out the problem. My fun car garage is in another city so will pick up tools tomorrow and have a go at it.
Al |
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08-27-2006, 03:56 PM
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