Question about 1993 GMC Sierra K1500

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Temp guage i changed temp sensor and sensor for fuel mixture,truck is starting better but temp gauge still not working correct

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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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temp sensor location, 2.2 liter engine:
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jturcotte_1823.gif

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1990 honda accord temp gauge above hot limit.


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Firstly - DO NOT run engine, when guage reads hot, as this will cause costly damage to head gasket & alloy engine head.

The fact that guage takes 1min to read HOT, would confirm the guage IS working properly.

So, other components which are likely to cause hot readings (in this order) are:

- lack of coolant (or leakage somewhere): is there sufficient green coolant at the correct level? Top up mixture to correct level. Repair any leaks.

- collapsed radiator hose: when engine is cold, start engine, then quickly watch both upper & lower radiator hoses to see if either begins to flex inwards (collapse). Replace if either hose is collapsed.

- bad/incorrect thermostat rating : when replacing thermostats, you must ensure it is of the SAME temp rating (they all differ).

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- bad waterpump: the engine relies on the waterpump to distribute the coolant throughout the entire system. If waterpump is faulty, coolant will not flow quick enough, causing overheating.

If you still believe all of the above components are OK, then have your cooling system "pressure tested". This test should be done, before looking further at other electrical components.

Cheers,

"if this has helped you in any way, please rate this solution"

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Sounds like faulty engine temp sensor. When it drops to cold, the engine control unit picks this up and alters the fuel mixture accordingly. The ECU will be making it a very rich fuel mixture for cold starting, hence very poor running when engine is hot.

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