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Engine Temp. Gauge 200 1993

posted by someone claiming to be Dave on Fri Mar 29 18:38 CST 2013 [RELATED]

Since I have owned my '93 240 wagon (currently at 218,XXX miles) the engine temp. gauge has not worked properly. It usually doesn't ever quite make it even halfway to the mark where it should be. Only once have I noticed that it was at that mark and only for about 10 minutes. Sometimes the needle just drops completely down. Usually fluctuates between halfway to the normal temp. mark and not registering at all. Any ideas on how to fix this?

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here are a few simple steps to determine what is the source 200 1993

posted by trichard on Sat Mar 30 04:39 CST 2013
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last visit: Fri Oct 24 05:52 CST 2014

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1. disconnect the yellow wire under the intake manifold to the sensor and hold it to the engine block with the key on in the 2 position

answer: if the gauge goes all the way to the top red line you have nothing wrong with the gauge itself. if it only goes up halfway or as you describe rep-lace the gauge

2. if on step 1 the gauge goes up all the way under this test your comp board is failing and either needs replacing or better yet. bypass it by soldering a jumper wire between pins 1 and 3 after tossing the board

3. if the problem remains after bypasing the comp board replace the sensor mounted in the cylinder head.

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Engine Temp. Gauge 200 1993

posted by anthony2 on Fri Mar 29 19:27 CST 2013
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last visit: Tue Jul 22 20:01 CST 2014

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Replace it. Happened to our '89 wagon. Fairly common. You dont have to buy the whole cluster. P 'n Pulls are best bet, for me anyway. Easy to change.

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Engine Temp. Gauge 200 1993

posted by scorron on Fri Mar 29 19:24 CST 2013
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last visit: Tue Oct 7 21:10 CST 2014

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Search for "temperature compensation board bypass" and you should find the topic covered many many times. It's common and easy to fix.

P.S. It is usually more effective to search the Brickboard using Google. Follow up your search terms with "site:brickboard.com" (no quotes) and you will find you answer and more.

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Engine Temp. Gauge 200 1993

posted by someone claiming to be Dave on Sat Mar 30 07:23 CST 2013 [RELATED]

Thanks! I removed the board this morning and connected pins 1 and 3 with lamp wire. I went for a drive to test it and the temp slowly rose to the dot, then went just slightly above it, and finally came to rest a little more than slightly below the dot and seemed to stay there. I uploaded a photo- is this where it should be? I have a '91 sedan and the needle is always right on the dot in that car once it warms up.

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Engine Temp. Gauge 200 1993

posted by scorron on Sun Mar 31 10:30 CST 2013
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last visit: Tue Oct 7 21:10 CST 2014

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Looks like you solved the problem. Now that the compensation board is bypassed, you have a much more accurate gauge.

Your '91 sedan is basically lying to you. Engine temperature fluctuates quite a bit depending on ambient temp., air movement, engine speed, etc. and so an accurate gauge would never read exactly at 9 o'clock all the time. A functioning compensation board (or temp. faker) will read exactly 9 o'clock unless the engine overheats past a programmed point, at which time the needle will shoot all the way up. It's basically a dummy light. You might want to bypass the board in your '91 sedan as well.

Congrats on the success!

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Engine Temp. Gauge 200 1993

posted by pageda on Sat Mar 30 08:09 CST 2013
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last visit: Fri Oct 24 13:18 CST 2014

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That is about right, this is not an accurate gage but it should be consistent from now on.

What you observed was the engine heating up to the point where the thermostat opened and the temperature dropping off a bit for normal operating temperature. From now on this is your new normal operating temperature.
Dan

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Engine Temp. Gauge 200 1993

posted by someone claiming to be Dave on Sat Mar 30 07:28 CST 2013 [RELATED]

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Engine Temp. Gauge 200 1993

posted by someone claiming to be Dave on Sat Mar 30 07:32 CST 2013 [RELATED]

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Engine Temp. Gauge 200 1993

posted by matt b on Fri Mar 29 19:20 CST 2013
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last visit: Tue Oct 14 16:33 CST 2014

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Where do you live (climate), how does the heater work, and is your fuel mileage below normal?

First guess would be thermostat..

--
-Matt I ♥ my ♂

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