 Whoops..., The tach needle ain't movin! |
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| alpha434 |
 Oct 7 2007, 08:26 AM
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#1
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My member number is no coincidence.  Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains  |
Was driving home from work this morning, and the tach needle flatlined.
Now here's the clutch- I drive a L-jet car. So the problem can't be at the dizzy because the tach signal triggers the F.I.,, Right??? Any help would be appreciated... |
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| Dave_Darling |
Oct 7 2007, 01:45 PM
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#2
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914 Idiot Group: Members Posts: 15,161 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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Slits, the tach and L-jet signals come from the (-) side of the coil, where the points plug in.
Sounds like the tach is dead, probably mechanically. Electrical problems in the tach would tend to make the car run poorly due to inconsistent ignition and/or injection. --DD |
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| swl |
Oct 7 2007, 08:38 PM
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#3
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Senior Member Group: Members Posts: 1,409 Joined: 7-August 05 From: Kingston,On,Canada Member No.: 4,550 Region Association: Canada |
QUOTE(Dave_Darling @ Oct 7 2007, 11:45 AM)  Sounds like the tach is dead, probably mechanically. Electrical problems in the tach would tend to make the car run poorly due to inconsistent ignition and/or injection. Unless the electrical problem was high resistance or an open between the coil and the tach. I agree that the needle is a high probablilty suspect but I think I'd be checking continuity before writing off the tach itself. Try an ohm meter between the - coil and pin 7 of the big plug at the top of the relay board. |
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Posts in this topic
alpha434 Whoops... Oct 7 2007, 08:26 AM
SLITS The tach signal is from the + side of the coil ...... Oct 7 2007, 08:58 AM
Cap'n Krusty
The tach signal is from the + side of the coil ..... Oct 7 2007, 04:32 PM r_towle I am pretty sure that the tach circuit is an indep... Oct 7 2007, 11:34 AM alpha434 New tach? Oct 7 2007, 03:38 PM alpha434 Boy. I'm sure glad I didn't listen to slit... Oct 7 2007, 04:53 PM Brando How exactly would a 'mechanical' tach work... Oct 7 2007, 05:57 PM SLITS I stand admonished for misinfomation .... guess I ... Oct 8 2007, 10:03 AM |
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