Bouncing Speedo? - Ford Powerstroke Diesel Forum

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post #1 of 11 Old 11-18-2008, 08:24 AM Thread Starter
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Bouncing Speedo?

I have owned my stroke for a little over a week now, and am working on fixing all the little trivial stuff.

My speedo starts almost bouncing above 50 as you build speed. Once I settle on a speed it stays relatively stable, but bounces from time to time. What would be the source of this?

Also my voltmeter doesn't read correctly and is very slow to move at all. Not the normal slow as in a couple mins but as in 10 miles before it hits the N in normal and never goes higher than o.

2000 Cummins 4x4 on 35's towing a rubicon on 35's.
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post #2 of 11 Old 11-18-2008, 09:08 AM
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I think the e40d in your truck has a worm gear on the output shaft for the speedo. May be worn out.

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post #3 of 11 Old 11-18-2008, 12:01 PM
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There is a sensor that screws into your rear diff that may be dirty....my speedo was bounching and it cleared up after I cleaned the gunk off the sensor

ChrisChris
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post #4 of 11 Old 11-18-2008, 12:03 PM
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my old 92 stang does it lol. I got pulled over at the beach one time and the cop asked me if I knew how fast I was goin and I told him somewhere between 30 and 45. Luckily he let me off lol

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post #5 of 11 Old 11-18-2008, 12:34 PM
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Quote:
Originally Posted by Maverick1701 View Post
There is a sensor that screws into your rear diff that may be dirty....my speedo was bounching and it cleared up after I cleaned the gunk off the sensor
The speedo has NOTHING to do with the rear diff. Speedo sensor is on the TRANS.

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post #6 of 11 Old 11-18-2008, 12:55 PM
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I looked in my ford service man. and from what it says...
The sensor in the rear diff is called both a VSS and RABS sensor in the Ford factory service manual. Some sensors serve more than 1 function.

ChrisChris
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Last edited by Maverick1701; 11-18-2008 at 02:17 PM.
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post #7 of 11 Old 11-18-2008, 01:54 PM
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I stand corrected.

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post #8 of 11 Old 11-18-2008, 02:18 PM
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Quote:
Originally Posted by rooky_07 View Post
I stand corrected.


you are correct about a VSS being located in the transmission...I am not sure about the difference in the 2

also just fyi the bowing smilies shouldnt be directed at me....only the 1 true god, Mr Norris




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Last edited by Maverick1701; 11-18-2008 at 02:23 PM.
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post #9 of 11 Old 11-18-2008, 02:33 PM
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post #10 of 11 Old 11-18-2008, 10:18 PM
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Quote:
Originally Posted by rooky_07 View Post
I stand corrected.
So I was able to find out what exactly the vss does in the rear (I wasnt quite sure)
Its just a magnetic pickup sensor, no gear like the old fords when they were on the transfer case. It picks up a signal from a small ring gear in the diff.

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