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Old 01-28-2008, 10:03 AM
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?

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Old 01-28-2008, 10:07 AM
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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Old 01-28-2008, 08:18 PM
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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Old 01-28-2008, 09:39 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.
If it ain't broke take it apart and find out why.

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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Old 01-28-2008, 10:13 PM
Registered User
Join Date: Oct 2005
Posts: 4,263
Another possibility is the engine to body ground strap.

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