Tachometer Not Working
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Junior User
Joined: May 2010
Posts: 85
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From: San Luis Obispo, CA
Tachometer Not Working
I have a 1994 f-250 extended cab long bed 2wd 460 with 215,000 miles. the tachometer does not work it just stays at 0 rpm, it did not work when i bought it last year either. any ideas on what could be the problem?
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
The VSS might be umplugged or damaged, or the rear differential was rebuilt and the didn't place the ring that works with the VSS. For the VSS, search around your rear diff. for anything that looks like a sensor. Your tach could also be gone, but i would check the two other options first.
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Junior User
Joined: May 2010
Posts: 85
Likes: 1
From: San Luis Obispo, CA
The VSS might be umplugged or damaged, or the rear differential was rebuilt and the didn't place the ring that works with the VSS. For the VSS, search around your rear diff. for anything that looks like a sensor. Your tach could also be gone, but i would check the two other options first.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
VSS? You thinking speedo?
For the tach check the white-pink circuit for continuity between the ignition suppression resistor and the tach end connector, as well as the connections at each end for corrosion, if that all tests/looks good you probably just gotta dead tach.
Might be a fault in the TFI module but you should be throwing an error code for IDM failure if that was the case, 212 for example.
For the tach check the white-pink circuit for continuity between the ignition suppression resistor and the tach end connector, as well as the connections at each end for corrosion, if that all tests/looks good you probably just gotta dead tach.
Might be a fault in the TFI module but you should be throwing an error code for IDM failure if that was the case, 212 for example.
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Junior User
Joined: May 2010
Posts: 85
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From: San Luis Obispo, CA
I think I may have found the problem. I checked under the hood and the pink and white wires looks good. But I found a black wire that is completely broken, I had never noticed this before (although I did not know where to look). I took some pictures of the problem. Could this be the reason my tach is not functioning??
http://s231.photobucket.com/albums/e...h.jpg&newest=1
tach2.jpg picture by tpcgreg - Photobucket
http://s231.photobucket.com/albums/e...h.jpg&newest=1
tach2.jpg picture by tpcgreg - Photobucket
The Southernmost Mod
Joined: Dec 2004
Posts: 6,902
Likes: 20
From: Caracas, Venezuela
Oh sorry, i got confused, follow the other guy's advice, i was in fact thinking about the speedometer when i wrote my answer...
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Junior User
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No problem
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Junior User
Joined: May 2010
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From: San Luis Obispo, CA
Can't, it's broken. It won't plug back in.
Does anyone have an idea on how much a professional would charge to fix the tach? Just a general estimate.
Lead Driver
Joined: Aug 2006
Posts: 5,670
Likes: 12
From: Sand Lake, MI
Oh didn't see your second picture, you can pull the broken piece out of the rubber and reinsert the line back into it. The barbed end will be lost but it will stay in place ok by itself. If you're not to happy with it like that you can apply a little silicone on the end of the line and then push it in place. Once the silicone sets up over night, that will hold it.
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Junior User
Joined: May 2010
Posts: 85
Likes: 1
From: San Luis Obispo, CA
Oh didn't see your second picture, you can pull the broken piece out of the rubber and reinsert the line back into it. The barbed end will be lost but it will stay in place ok by itself. If you're not to happy with it like that you can apply a little silicone on the end of the line and then push it in place. Once the silicone sets up over night, that will hold it.
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