 Temperature gauge going nuts! |
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| fduval |
 Aug 12 2017, 03:57 PM
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#1
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Newbie  Group: Members Posts: 41 Joined: 2-January 13 From: quebec Member No.: 15,331 Region Association: Canada  |
On my 1973 914 2 liter, the oil temp gauge started acting crazy ( like going up and down the scale like a nut ) ???? any ideas why it is acting this weird ? flickering !!!
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| Porschef |
Aug 12 2017, 03:59 PM
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#2
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How you doin' Group: Members Posts: 2,180 Joined: 7-September 10 From: LawnGuyland Member No.: 12,152 Region Association: North East States 
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Seems like a ground issue. Did you track down a replacement yet?
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| 914Sixer |
Aug 12 2017, 04:01 PM
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#3
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914 Guru Group: Members Posts: 9,122 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Your wire from the sender is brittle and going open.
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| fduval |
Aug 12 2017, 04:04 PM
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#4
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Newbie Group: Members Posts: 41 Joined: 2-January 13 From: quebec Member No.: 15,331 Region Association: Canada |
QUOTE(914Sixer @ Aug 12 2017, 02:01 PM)  Your wire from the sender is brittle and going open. Thats what I tought , so its not the gauge itself that is kaput ? |
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| McMark |
Aug 12 2017, 04:18 PM
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#5
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Nope. Wire.
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| porschetub |
Aug 12 2017, 05:52 PM
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#6
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Advanced Member Group: Members Posts: 4,816 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
yep poor contact on supply wire but most likely the ground,sender failure is pretty rare.
Try to supply the gauge with another temporary ground and see what happens. |
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| McMark |
Aug 13 2017, 08:06 AM
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#7
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Actually, the more likely wire that's failing the Green/Black wire that carries the signal from the sender in the engine sump to the gauge.
If I were testing this issue, I would make a long jumper wire and simply disconnect the sender, and install the jumper wire, then run it out from under the car and in the door and over to the gauge and connect it there (after removing the Grn/Blk). See if that solves the problem, then case the Green/Black wire to find the failure. It's probably rubbed through the insulation somewhere near the motor. There is a connector under the battery (usually in a plastic housing) and I'd inspect the length of wire from that connector to the sump sender first. |
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| Keith914 |
Aug 13 2017, 08:16 AM
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#8
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Member Group: Members Posts: 248 Joined: 29-April 16 From: Laguna Beach, California 92651 Member No.: 19,948 Region Association: Southern California |
QUOTE(fduval @ Aug 12 2017, 03:04 PM) QUOTE(914Sixer @ Aug 12 2017, 02:01 PM) Your wire from the sender is brittle and going open. Thats what I tought , so its not the gauge itself that is kaput ? Typical of a loose or failing harness connection. |
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| iankarr |
Aug 13 2017, 11:52 AM
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#9
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,556 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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Exactly what happened on my car. And exactly as McMark said. I replaced the wire from the taco plate sender to the connector under the battery. No more shakes. Well, on the temp sender anyway.
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| fduval |
Aug 14 2017, 09:53 AM
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#10
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Newbie Group: Members Posts: 41 Joined: 2-January 13 From: quebec Member No.: 15,331 Region Association: Canada |
QUOTE(fduval @ Aug 12 2017, 01:57 PM) On my 1973 914 2 liter, the oil temp gauge started acting crazy ( like going up and down the scale like a nut ) ???? any ideas why it is acting this weird ? flickering !!! You guys are right . I tracked down the black & green wire and found it was rubbing, the protection worned off and was causing a grounding on the chassis. Now fixed. Thanks |
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