Question about 1991 Honda Accord

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Temp gauge bouncing up an down

Just today I was driving down the highway in my 91 accord and my temp guage started to act erratically, it jumped up to hot and was bouncing around from noramal to hot back to normal very quickly but the engine didnt seem like it was overheating. Now that the car has cooled down the gauge still reads hot. Does anyone know what this could be?

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  • jd95949 May 23, 2009

    Hey fellas thanx for the advice, I appreciate it. Dont hink you could tell me which one it is could ya? They both have two wires coming out of them, one has a black and blue wire and the other has a black and white wire coming out of it. One is significantly harder to get to as well. Also is it safe to drive like this, thanx again.

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I would say if the fluid is full and the thermostat is not sticking it would be your engine coolant temperature sensor (ect) sensor

Posted on May 23, 2009

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That vehicle has two coolant temp sensors on it, both are on the passengers side of the end of the head, where the thermostat housing is. One has a two wire plug, this one tells your fans to come on the other is one single pin, this one is for your temp gauge. This sensor works off resistance, the higher the resistance the higher the gauge in the car goes. This sensor has probably grounded out and pegged your gauge in the car. Replace that sensor and you should be good to good, not too expensive either. Good luck.

Posted on May 23, 2009

  • ENSANE1970 May 23, 2009

    I'm sorry I forgot about the third sensor, the two you are looking at are one is for the fans, the black one if I remember correctly, and the other is the sensor for the ECM so it knows how to fire the injectors. there should be one below these with one single wire going to it thats the gauge wire. Disconnect it and if your gauge is still pegged it should go to cold. As far as running like that no it won't hurt anything,but that's a gauge you definitley want working in that car.

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