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Temp Gauge Inaccurate

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Old Mar 10, 2017 | 06:34 PM
  #1  
seanof30306's Avatar
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From: Tulsa, OK
Car: 1989 Formula WS6
Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Temp Gauge Inaccurate

Ever since I did my headers and exhaust, the temp gauge has read about 50 degrees low. It seemed to work fine before then

The fan comes on when it should, at 193 degrees, but I went ahead and changed the sending unit, anyway. No help.

Does anyone have any ideas?

Thanks
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Old Mar 13, 2017 | 05:02 PM
  #2  
NINÅ's Avatar
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Joined: Jan 2006
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From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
Temper Tantrum

Here’s how to test the temp gage.

Disconnect the
green wire from the temp sensor.

Clip in a 100 ohm resistor from that wire to the
battery terminal.

Turn the key to RUN.

If the gage is good it will read about 220°.


Happy Racing !



I Smacked The Wall With The Side Of The Car Because A Narrower Car Is A Faster Car

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Old Mar 14, 2017 | 09:56 AM
  #3  
seanof30306's Avatar
Thread Starter
Supreme Member
20 Year Member
iTrader: (4)
 
Joined: Jan 2003
Posts: 1,613
Likes: 10
From: Tulsa, OK
Car: 1989 Formula WS6
Engine: L03 305 TBI
Transmission: T-5
Axle/Gears: 10 Bolt; 3.42 Posi
Re: Temper Tantrum

Originally Posted by NINÅ
Here’s how to test the temp gage.

Disconnect the
green wire from the temp sensor.

Clip in a 100 ohm resistor from that wire to the
battery terminal.

Turn the key to RUN.

If the gage is good it will read about 220°.


Happy Racing !



I Smacked The Wall With The Side Of The Car Because A Narrower Car Is A Faster Car


That's good information, thanks for your help.

I remember reading something about a pigtail causing a similar problem a couple of years ago, but I can't find the thread.
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