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  #1  
Old 07-10-2021, 03:21 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,121
OM 602 Twitchy temp guage

Guys,

I have noticed that my temp gauge is getting twichy, seems to bounce between 80 and 100, before settling down to 90.

I am thinking it may be a faulty temp sender unit. What do you say?

Thanks!!!

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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 133K miles-replaced the other '06 that quit after 300k miles. (did not catch the bad cam in time)

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #2  
Old 07-10-2021, 07:15 PM
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Join Date: Sep 2007
Location: Long Beach,CA
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Check the contact surfaces of the electrical connector.

Not seen this happen before but what it was the Thermostat jerking around.

This was on a gasser and it did not have your symptoms. I had the temp probe get coated with white residue and which apparel did not conduct heat to the sensor well. When cleaned off everything was normal.

And of course it could be a failing sensor.
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  #3  
Old 07-10-2021, 08:31 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,121
I will check all that! Thanks!
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RRGrassi


70's Southern Pacific #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 133K miles-replaced the other '06 that quit after 300k miles. (did not catch the bad cam in time)

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 195K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #4  
Old 07-11-2021, 10:43 PM
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Join Date: Dec 2006
Posts: 3,896
Each of the gauges in the cluster is damped by a coil. In the event of a voltage spike, the coil presents an impedance that prevents the gauge from reacting quickly. If the coil shorts to the gauge case, the needle will jump. Unless you have a spare gauge on hand, the correction is to use a bit of electrical tape to insulate the gauge case and slide a length of shrink wrap over the coil. More here:

https://www.peachparts.com/shopforum/diesel-discussion/394040-solutions-some-odd-dashpod-problems.html#3
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  #5  
Old 07-13-2021, 09:16 PM
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Join Date: Jun 2021
Location: Indianapolis, IN, USA
Posts: 12
There is a guy in youtube named Impalaman's garage who had this very problem and takes you through the procedure to fix it. Check it out.

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