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  #1  
Old 01-28-2008, 09:03 AM
minimike
 
Join Date: Oct 2007
Location: LI, NY
Posts: 320
temp gauge jumping about

My son's temp gauge on his 85 240D has been erratic. I'm thinking a bad connection at the temp sender. Any other ideas?
Also his fuel consumption seems to be horrible as of yesterday. I thought maybe a sticking fuel sender which might show lots of fuel and suddenly take a dive when the tank empties. Any thoughts here? Who's been there?
Mike

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  #2  
Old 01-28-2008, 09:07 AM
ForcedInduction
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Posts: n/a
Jumping temperature needle is either a bad ground or a bad sender (Located between the #2-3 cylinders on the head).

What is the actual MPG?
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  #3  
Old 01-28-2008, 07:18 PM
minimike
 
Join Date: Oct 2007
Location: LI, NY
Posts: 320
I don't know the milage because I don't drive it. I'll have my son do a fill, drive and refill and chart the stats. Thanks.
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  #4  
Old 01-28-2008, 08:39 PM
crashone's Avatar
1983 300SD, 4 speeed
 
Join Date: Jul 2006
Location: Raleighish, NC
Posts: 664
Check the wire connection at the block sensor, it may be broken or ready to break. Mine just did this, I had to resolder the connection, now no jumping. Keep notes on the mileage for fuel consumption, you will soon find out how far you can go. Good luck.
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1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon
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  #5  
Old 01-28-2008, 09:13 PM
Registered User
 
Join Date: Oct 2005
Posts: 4,263
Another possibility is the engine to body ground strap.

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