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Is there a way to figure out if the temp sensor is the problem, when I cold start my E150 v8 it immediatly goes to the mid range on the temp guage.

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Sounds like the ecu water temp gauge is fried.

Posted on May 03, 2013

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Posted on Jan 02, 2017

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SOURCE: temp guage

I mean no offense by this post in any way. But it sounds like you might have installed the wrong sensor. All of these sensors have a specified heat range of operation that it works in, and monitors. The thermo-resistor in the sensor could be the wrong specified heat range.

It may be because of a slight error in reading the serial numbers between the two (Old one and new one) but could also be that when you bought a new one, the wrong one could have been in the box that you recieved -- Which does happen occasionally.

This could also have happened with your Temperature Gauge, so check to make sure you have the correct one, and it is installed properly.

However if you're certain it is the correct sensor, get yourself a wiring schematic/diagram for the Temperature Sensor wiring and check the resistance in both the power wire, and the signal wire, and the ground wire if applicable (Depending on what type of sensor it is, a 2-wire or 3-wire.) If resistance in one of those wires is higher or lower than specified for the Sensor, it can cause a false reading to the ECM and/or the Gauge.

Posted on May 16, 2008

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You need to change the thermostat, it must be stuck open and the computer thinks the engine is always cold, hence the fast idle and smoke.

Posted on Sep 22, 2008

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could be vaccum leak in the a/c panel where the flappers open and close to allow hot and cold air to blow

Posted on Jan 03, 2009

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SOURCE: Audi A4 1.8T Quattro 09/2003 Temp guage rises as

Could be thermostat this regulates the water flow around the engine to keep it cool sounds like it is sticking open when water gets hot!!

Posted on Jun 09, 2009

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SOURCE: 1995 ford ranger with 4.0 auto, I have very

Hi. There are several ways to test the opening temperature of a thermostat. Use this procedure to confirm that you are running the correct rated thermostat.

One method does not require that the thermostat be removed from the engine.

* Remove the radiator pressure cap from a cool radiator and insert a thermometer into the coolant.
* Start the engine and let it warm up. Watch the thermometer and the surface of the coolant.
* When the coolant begins to flow, this indicates the thermostat has started to open.
* The reading on the thermometer indicates the opening temperature of the thermostat.
* If the engine is cold and coolant circulates, this indicates the thermostat is stuck open and must be replaced.

The other way to test a thermostat is to remove it.

* Suspend the thermostat completely submerged in a small container of water so it does not touch the bottom.
* Place a thermometer in the water so it does not touch the container and only measures water temperature.
* Heat the water.
* When the thermostat valve barely begins to open, read the thermometer. This is the opening temperature of this particular thermostat.
* If the valve stays open after the thermostat is removed from the water, the thermostat is defective and must be replaced.
* Several types of commercial testers are available. When using such a tester, be sure to follow the manufacturer's instructions.
* Markings on the thermostat normally indicate which end should face toward the radiator. Regardless of the markings, the sensored end must always be installed toward the engine.
* When replacing the thermostat, also replace the gasket that seals the thermostat in place and is positioned between the water outlet casting and the engine block.
* Generally, these gaskets are made of a composition fiber material and are die-cut to match the thermostat opening and mounting bolt configuration of the water outlet.
* Thermostat gaskets generally come with or without an adhesive backing. The adhesive backing of gaskets holds the thermostat securely centered in the mounting flange, leaving both hands of the technician free to align and bolt the thermostat securely in place.

Posted on Dec 22, 2009

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