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temp gauge

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Old Dec 29, 2009 | 07:26 PM
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temp gauge
I have a 1987 F150 300ci I6 4x4. The temp gauge will move only slightly when the engine is warm or hot. I checked the sending unit according to the Chilton manual and it checks ok. When I pulled the connector off my son said the gauge went up slightly, only about 1/4 of it's C to H range. I then grounded the positive wire with the key off and with the key on engine off. Both ways the gauge did not move above the 1/4 position.
Is there any other test I need to do before I conclude that the gauge is bad?
 
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Old Dec 29, 2009 | 07:31 PM
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uhm ur not making any sence.... the gauges normally read around O or the R range.. in the word NORMAL wich is a quater of the way....
 
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Old Dec 29, 2009 | 08:02 PM
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temp gauge
Sorry for the confusion. I meant the Cold to Hot range. The Cold being on the left side of the scale and the Hot being on the right side.
 
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Old Dec 29, 2009 | 08:55 PM
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mine does the same thing, even reads so hot that the engine light comes on. but never actually gets hot. what would cause this?
 
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Old Dec 29, 2009 | 09:32 PM
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a short in the wire bad sending unit... corosion or loose connection someplace
 
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Old Dec 30, 2009 | 07:16 AM
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From: Elmvale
My 95 351 has the same problem but on occation it will rise a little more but not very often. Usually stays just off cold.
 
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Old Dec 31, 2009 | 02:18 PM
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im gonna unhook it, and wire in a new gauge.

problem solved
 
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Old Dec 31, 2009 | 02:23 PM
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From: Easton,Ks
Make sure you are working with the one wire sensor, if it has two wires you have the wrong one.
 
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Old Dec 31, 2009 | 02:26 PM
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its the one on the intake manifold. front driver's side of it. at least on the 5L
 
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