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Join Date: Apr 2002
Location: Manassas Va
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Calling all Tach Guru's, Help !!!!
Guys,
My tach is doing weird stuff. Works fine for days on end, then all of a sudden it dies and drops to zero. Sometimes it starts to drop in RPM on the dial but then comes back up again. Doesn't seem to matter what RPM or weather condition. It sometimes comes back on it's own. If I tap on the glass faceplate it pops back to life (everytime) and will work for seconds, mintues or days. The fact that I can tap on the gauge face and have it come back to life leads me to believe that it's in the gauge. Anything inside these things that need to be cleaned or adjusted? I've pulled the plug on the back and cleaned the contacts and put on dieelectric paste on but it still does it randomly. Shift light now works great though after not working for about two years!
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Dan O 84' 3.2 Targa |
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10-11-2004, 11:46 AM
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What no one have an opinion or smart ass comment on this? Guy's where's the love?
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Dan O 84' 3.2 Targa |
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10-11-2004, 03:45 PM
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May be can be a ground problem or bad contact problem.
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1972 911T 1991 Mazda RX-7 Turbo II Are you car loosing power? When was last time you service your fuel injectors? Dirty fuel injectors? Why no try a complete fuel injector cleaning service and return the dignity to you car. Visit www.rennsportfuel.com and we will return your injectors back to life! |
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10-11-2004, 04:55 PM
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Location: Port Macquarie Australia
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I had weird tacho problems in my 88, it was due to a bad voltage regulator. The car's voltage was not being held to 13.5v and was varying as high as 22v under revs. The tach would bounce all over the place. It is easy to check just measure the voltage across the battery terminals with the engine running. It was a simple job to replace the regulator.
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2008 BMW 320i 2006 Mercedes ML320 2004 Mercedes ML270 cdi 1998 Porsche Boxter 1988 Porsche 930 Targa (sold) |
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10-12-2004, 01:38 AM
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tach problem
Dan,
I have my tach apart at the moment. The old circuit is bust, I have built a new one using an electronic breadboard and various components, so I have a reasonable knowledge about its heart. From your description I would suspect either a broken internal connection, dry solder joint, or the needle movement is physically imparied somehow. I think a close visual inspection will identify the problem. Have a multimeter handy and check continuity Depending on the model, taking the tach apart can be difficult. You may need to bend back half of the rim in order to disconnect the back housing. Take it easy. |
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10-12-2004, 04:57 AM
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Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 2,350
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Send it to Pelican before it gets destroyed!
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Have Fun Loren Systems Consulting Automotive Electronics '88 911 3.2 '04 GSXR1000 '01 Ducati 996 '03 BMW BCR - Gone |
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10-12-2004, 05:44 AM
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Location: Southern California
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If Pelican can't help with a rebuild/repair, send it to North Hollywood Speedo.
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1984 Targa |
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10-12-2004, 05:50 AM
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Okay Guys, Now that's the kind of love I'm talking about.
Thanks everyone for your input. Pokdub, thanks for your input too since you seem to be up to your eyeballs inside the thing. That's way past anything I'm capable of so it's off to someone else or find a new/used one. Anybody got any idea what the comparison between rebuilding this one and finding a used one would be?
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Dan O 84' 3.2 Targa |
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10-12-2004, 06:07 AM
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1972 Porsche 911T 2.4 Weber
Time Machine
1969 Porsche 911E 2.2Ltr
