Question about 1992 Toyota 4Runner

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Coolant Temp sensor

I have the missing problem with my 1992 4Runner and just had a Coolant temp sensor put in. The mechanic said it was reading at 89 ohms and should be 12? Or other way around. Can someone explain what ohm means and could that be the cause of my engine missing? I will be taking it on a big drive tomorrow. Does it take time to send signals with that much of a difference? I am clueless to 89 vs 12? Help

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  • D J
    D J Jan 17, 2009

    Yes Guys I know now that it is a series of elimination with this missing, or hesitating problem...arg..I am throwing money out the window with this guessing game and still no solution. I appreciate the input and it makes me feel a tad better that I am not the only one playing this game...lol...It looks like I just have to resort to the Toyota dealership to locate and find the actual problem. I've already replaced the whole engine pretty well in the 3years since owning it and I'm just about done. I am looking into purchasing a brand new one off of the lot. Oh the drive into Vancouver was rough, but drive back smooth as silk...go figure

  • gasitjr May 11, 2010

    The coolant temp sensor lets the engine computer know what its opperating temp is.It then adjusts the fuel rates accordingly.If the preset resistance value (measured in OHM's), is wrong (bad sensor), it would signal the engine to add to much fuel or to little fuel.Both can cause a misfire!

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The coolant temperature sensor should read at approx 1,800 ohms between 68 and 88 degrees F. As the temperature lowers, the resistance rises. More ohms. As the temperature rises, the resistance lowers. Less ohms. At 210 degrees, the ohms would be about .15 K ohms.

The 89 and the 12 figures are wrong.

Posted on Jan 17, 2009

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I agree with gasitjr also if the sensor was bad He could have checked the temp reading on his computer when the truck was cold or hot usualy it will give a fause reading also. The miss could be from a numbe rof thing s plugs wire coil injector or a week clynder

Posted on Jan 17, 2009

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Okay here is a chart. starting at 300 degrees
300* = 35ohms
210 = 185ohm
160 = 450 ohm
100 = 1600 ohms
70 = 3400
40 = 7500 ohms
20 = 13500
0 = 25000 ohms
-40 = 100700 ohms

  • There are more readings in between these temps but this should help i will enclose a web site if you need the other readings. this chart is good and readings have a + or - of 50ohms. good day. www.gmtemperaturesensorchart

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