 Tach problem |
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| tbox56 |
 Nov 24 2004, 09:33 PM
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#1
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Member  Group: Members Posts: 54 Joined: 14-November 04 From: Colorado Member No.: 3,115  |
I have a "72 1.7 with a tach problem. The tach will show an accurate reading of say 2500rpm and then spike to 4500 or 5000 rpm, with no change in engine speed. Any ideas what the problem is or is the tach shot?
Thanks, Tom |
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Replies(1 - 4)
| redshift |
Nov 24 2004, 09:44 PM
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#2
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Bless the Hell out of you! Group: Members Posts: 10,926 Joined: 29-June 03 Member No.: 869 |
I have no idea where, but somewhere, there is a schematic... it's near to where we are right now... but...
Sounds like a loose wire somewhere... like maybe the tach wire needs attention, in the engine hole. M |
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| SirAndy |
Nov 24 2004, 09:45 PM
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#3
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Resident German Group: Admin Posts: 41,640 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(tbox56 @ Nov 24 2004, 07:33 PM) Any ideas what the problem is or is the tach shot? i had the same problem and on my car it was a faulty relay board. some of the connections had corroded and were broken or shortening out ... it's probably a long shot for you, but if you have access to a know to be good relay board you might want to switch them out just to see if that changes anything ... (IMG:style_emoticons/default/wink.gif) Andy |
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| type47fan |
Nov 25 2004, 10:39 AM
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#4
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It Looks Better In Person. . . Group: Members Posts: 860 Joined: 17-September 03 From: Carlsbad, CA Member No.: 1,170 Region Association: Southern California 
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It was along time ago but. . .I had a similar problem with my '72. Check the mounting base for the points inside the dizzy. My tach would spike and I found the little metal ball/socket component had lost its spring tension allowing sloppy operation of the assembly. Replaced that little metal socket and solved my particular problem. Hope that made some sense.
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| Joe Bob |
Nov 25 2004, 12:44 PM
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#5
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Also...if you have another tach....hook it up and see if the problem is repeated. But more than likely it is a short somewhere like suggested above....
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