Tachometer Not Working - Ford Truck Enthusiasts Forums

Notices
1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

Tachometer Not Working

Reply

 
 
 
  #1  
Old 07-28-2010, 05:51 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
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?
 
Reply With Quote
  #2  
Old 07-28-2010, 06:42 PM
Encho's Avatar
Encho
Encho is online now
The Southernmost Mod
Join Date: Dec 2004
Location: Caracas, Venezuela
Posts: 6,671
Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.
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.
 
Reply With Quote
  #3  
Old 07-28-2010, 07:21 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
Question

Originally Posted by Encho View Post
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.
Thank you for your input. I crawled under the truck and located the sensor you were talking about. The wiring was still attached and I followed the wires for as long as I could and there did not appear to be any problems. My guess should be that the sensor has been damaged?
 
Reply With Quote
  #4  
Old 07-28-2010, 07:24 PM
Hitokori's Avatar
Hitokori
Hitokori is offline
Posting Guru
Join Date: Nov 2009
Posts: 2,244
Hitokori is gaining momentum as a positive member of FTE.
uhm the tach not speedo

check the reluctor ring and the magnetic pickup in the distributor then check the wires
 
Reply With Quote
  #5  
Old 07-28-2010, 07:26 PM
danr1
danr1 is offline
Post Fiend
Join Date: Aug 2006
Location: Sand Lake, MI
Posts: 5,640
danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.
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.
 
Reply With Quote
  #6  
Old 07-28-2010, 08:13 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
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
 
Reply With Quote
  #7  
Old 07-28-2010, 08:16 PM
Encho's Avatar
Encho
Encho is online now
The Southernmost Mod
Join Date: Dec 2004
Location: Caracas, Venezuela
Posts: 6,671
Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.Encho has a spectacular reputation.
Oh sorry, i got confused, follow the other guy's advice, i was in fact thinking about the speedometer when i wrote my answer...
 
Reply With Quote
  #8  
Old 07-28-2010, 08:20 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
Originally Posted by Encho View Post
Oh sorry, i got confused, follow the other guy's advice, i was in fact thinking about the speedometer when i wrote my answer...
No problem
 
Reply With Quote
  #9  
Old 07-28-2010, 08:25 PM
danr1
danr1 is offline
Post Fiend
Join Date: Aug 2006
Location: Sand Lake, MI
Posts: 5,640
danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.
That's not a wire its a vacuum line, plug it back in.

Next to the red one on the vac booster tank.

No, no effect on the tach.
 
Reply With Quote
  #10  
Old 07-28-2010, 08:30 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
Originally Posted by danr1 View Post
That's not a wire its a vacuum line, plug it back in.

Next to the red one on the vac booster tank.

No, no effect on the tach.

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.
 
Reply With Quote
  #11  
Old 07-28-2010, 08:32 PM
danr1
danr1 is offline
Post Fiend
Join Date: Aug 2006
Location: Sand Lake, MI
Posts: 5,640
danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.danr1 has a great reputation on FTE.
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.
 
Reply With Quote
  #12  
Old 07-28-2010, 08:37 PM
tpcgregsheh
tpcgregsheh is offline
Junior User
Thread Starter
Join Date: May 2010
Location: San Luis Obispo, CA
Posts: 85
tpcgregsheh is starting off with a positive reputation.
Originally Posted by danr1 View Post
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.
oh ok, that was helpful. Thank you
 
Reply With Quote
 
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
KB 80 F-150
1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks
14
08-13-2017 05:33 PM
M3maximation
1987 - 1996 F150 & Larger F-Series Trucks
5
04-10-2017 08:07 AM
92F2507.5
Ford Truck Parts for Sale
0
02-16-2017 07:13 PM
BGF100
1973 - 1979 F-100 & Larger F-Series Trucks
10
10-15-2016 09:58 AM
sweeted
1948 - 1956 F1, F100 & Larger F-Series Trucks
3
10-12-2016 08:50 AM


Thread Tools
Search this Thread
Quick Reply: Tachometer Not Working


Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.