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Extremely rich and rough idle
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<blockquote data-quote="Mustang5L5" data-source="post: 16477965" data-attributes="member: 38517"><p>Code 21 always displays unless you run the test with the vehicle at temp. If you are pulling the codes with a fully warmed up vehicle AND still have a code 21, I would take a look at the ECT sensor. </p><p></p><p>Use a meter to test the sensor: Set it to resistance and check the values based on the estimated coolant temp at the time (fully warmed up = 180-192 degrees)</p><p></p><p>50 degrees F = 58.75 K ohms</p><p>68 degrees F = 37.30 K ohms</p><p>86 degrees F = 27.27 K ohms</p><p>104 degrees F = 16.15 K ohms</p><p>122 degrees F = 10.97 K ohms</p><p>140 degrees F = 7.60 K ohms</p><p>158 degrees F = 5.37 K ohms</p><p>176 degrees F = 3.84 K ohms </p><p>194 degrees F = 2.80 K ohms</p><p>212 degrees F = 2.07 K ohms</p><p>230 degrees F = 1.55 K ohms</p><p>248 degrees F = 1.18 k ohms</p><p></p><p>If the sensor is good, you can probe the ECT connector from the rear for return voltage and verify.</p><p></p><p>50 degrees F = 3.52 v</p><p>68 degrees F = 3.02 v</p><p>86 degrees F = 2.62 v</p><p>104 degrees F = 2.16 v</p><p>122 degrees F = 1.72 v</p><p>140 degrees F = 1.35 v</p><p>158 degrees F = 1.04 v</p><p>176 degrees F = .80 v</p><p>194 degrees F = .61</p><p>212 degrees F = .47 v</p><p>230 degrees F = .36 v</p><p>248 degrees F = .28 v</p><p></p><p>A bad ECT will make the car run poorly.</p></blockquote><p></p>
[QUOTE="Mustang5L5, post: 16477965, member: 38517"] Code 21 always displays unless you run the test with the vehicle at temp. If you are pulling the codes with a fully warmed up vehicle AND still have a code 21, I would take a look at the ECT sensor. Use a meter to test the sensor: Set it to resistance and check the values based on the estimated coolant temp at the time (fully warmed up = 180-192 degrees) 50 degrees F = 58.75 K ohms 68 degrees F = 37.30 K ohms 86 degrees F = 27.27 K ohms 104 degrees F = 16.15 K ohms 122 degrees F = 10.97 K ohms 140 degrees F = 7.60 K ohms 158 degrees F = 5.37 K ohms 176 degrees F = 3.84 K ohms 194 degrees F = 2.80 K ohms 212 degrees F = 2.07 K ohms 230 degrees F = 1.55 K ohms 248 degrees F = 1.18 k ohms If the sensor is good, you can probe the ECT connector from the rear for return voltage and verify. 50 degrees F = 3.52 v 68 degrees F = 3.02 v 86 degrees F = 2.62 v 104 degrees F = 2.16 v 122 degrees F = 1.72 v 140 degrees F = 1.35 v 158 degrees F = 1.04 v 176 degrees F = .80 v 194 degrees F = .61 212 degrees F = .47 v 230 degrees F = .36 v 248 degrees F = .28 v A bad ECT will make the car run poorly. [/QUOTE]
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