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Registered
Join Date: Jun 1999
Location: San Mateo, CA
Posts: 64
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What's up with my tach?
Let's see, can anybody figure this one out? I'm perplexed.
I was driving home the other night and my tach stopped working. The next morning, it was working again. A few minutes later, the tach "bounced" and then I lost spark. I found the problem (bad coil connection), started the car, and kept going. Tach started working and then stopped. For the past week, the tach has worked fine for the first 5-10minutes of driving, then it consistently dies. I've checked connections and can't find anything. This is driving me nuts. Thoughts?
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Jamie McJunkin |
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11-21-2001, 05:41 AM
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Senior Member
Join Date: Apr 2001
Location: Finland
Posts: 1,214
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Overheating transistor in tach?
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Projects: 911 -72T EFI "964-look" "Smoky" 914 -71 1.7 D-JET "Rusty" |
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11-21-2001, 05:43 AM
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Registered
Join Date: Jun 1999
Location: San Mateo, CA
Posts: 64
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....and the car is a 71 but I've got a euro 3.0 and an aluminum 915 box in it.
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Jamie McJunkin |
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11-21-2001, 05:45 AM
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Join Date: Feb 2000
Location: Charlotte, NC USA
Posts: 270
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Sounds familiar. I had a similar problem several weeks ago.Car would start and tach would be irregular (bouncing around). Finally traced the problem to a set of points going bad. You might want to check your points as well.
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Shakenbake (Chris Baker) Need new toys 2001 VW Jetta VR6 2003 Sea Ray 200 Bow rider |
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11-21-2001, 05:54 AM
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Join Date: May 2000
Location: Los Alamos, NM, USA
Posts: 6,044
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If your distributor has points this is a typical symptom of the dwell being off and/or bad points. Check, adjust or replace and adjust as required. If the points have 10,000 miles on them its probably worthwhile to just replace them since they're relatively inexpensive.
 Jim
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11-21-2001, 06:38 AM
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Join Date: Feb 2001
Location: South of the Mason-Dixon Line
Posts: 3,722
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Jamie...
Had the same problem! I have a 2.4 liter, CIS, points and I would be driving and then suddenly the tach would go to zero. The car would slightly miss one-two-three times in a row and go back to normal again. Very intermittent. Pulling up to a light it would die sometimes. I came here to ask Pelican heads the same question and the concensus was POINTS! I checked that night and had NO GAP, although I replaced the points and set them 3k ago! I replaced them again because that carbon fiber block that nests on the distributor cam was wearing down. My mechanic suggested that I check the gap at least every oil change (3-5K) and that I do not use any excessive amount of cam grease as it can be slung onto the points or wires and short them out. Once the new points were installed, it was back to normal. I now carry an extra set in the glovebox. Good luck Bob '73.5 T |
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11-21-2001, 09:19 AM
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