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Hesitation

kokanee

By kokanee
in Ask A GM Technician

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kokanee Enthusiast

kokanee

Posted
Posted

I have a hesitation problem when the engine is cold on a '99 5.3 Liter. I have also noticed my temperature gaguge appears to be out as well. When I first start my truck in the morning after it has sit all night the temp gauge is already showing 75 degrees (It has been around freezing temperature outside)

 

I have done the test with voltages/temperatures off of the engine temperature sensor. My truck is Canadian so temps are in Celcius.

 

Minutes of Test Resistace of ETS Voltage Temperature (Instrument Cluster)

 

0 2.06K Ohms

1 2.1 75

2 1.53 75

4 0.9 76

4.5 3.545 76

6 3.375 78

7 3.1 81

10 2.8 84

20 2.42 87

35 2.041 94.5

35 231 Ohm 94.5

 

The first and last readings were taken with the engine off. 94.5 degrees appears to be normal operating temperature.

 

Do these numbers look normal?

bobcat5544 Enthusiast

bobcat5544

Posted
Posted

Did you have the sensor unpluged when testing for ohm values. If not retest it again with it unpluged. With the sensor pluged in you will not get correct readings.

 

I mainly need to know what the resistance is when it is cold or same as outside temp.

kokanee Enthusiast

kokanee

Posted
  • Author
Posted

Yes, the sensor was unplugged for the OHM readings.

 

The first ohm reading was when the engine was cold (2.06 K Ohm)

 

The second ohm reading was when the engine was at operating temp (231 Ohm)

bobcat5544 Enthusiast

bobcat5544

Posted
Posted

I'm sorry, I was out of the office for a few days and forgot to reply back to you.

 

With the readings you have the ect sensor is out of spec and would cuase hesitation

 

At freezing or 0 °C the OHM reading should be around 9420 OHMS or 9.4k OHMS

 

Here is the chart

 

Temperature vs Resistance Values (Approximate)

°C °F OHMS

150 302 47

140 284 60

130 266 77

120 248 100

110 230 132

100 212 177

90 194 241

80 176 332

70 158 467

60 140 667

50 122 973

45 113 1188

40 104 1459

35 95 1802

30 86 2238

25 77 2796

20 68 3520

15 59 4450

10 50 5670

5 41 7280

0 32 9420

-5 23 12300

-10 14 16180

-15 5 21450

-20 -4 28680

-30 -22 52700

-40 -40 100700

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