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PKRWUD · 09-27-2001, 12:27 PM

95mustanggt-
Absolutely. But that would also mean that the engine would have to have been 210 degrees when the KOER test was done. The correct way to perform a KOEO & KOER is to start with the vehicle cold, start the engine and idle at 2000 rpm for 2 minutes. Shut off the engine and do the KOEO test, followed immediately by the KOER test. This way, the engine coolant temp is hot enough to pass the self test, yet cool enough to keep the T-stat closed, maintaining a passing temp. If the engine was at a steady 210 degrees during KOER, the temp gauge would be well above normal. A quick way to check that theory would be to clear all codes, and perform a KOEO self test with the engine cold, and the air temp 65 degrees or warmer. If a code 21 comes up, then the ECT is saying that the coolant temp is below 50 degrees, which wouldn't be true if the air temp is 65 or above, indicating the ECT is reading below actual. This would still trip a code 21 during KOER, though.

What was the engine temp when the KOEO self test was done? What was the engine temp when the KOER self test was done?

Take care
~Chris

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09-27-2001, 12:27 PM	#6
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	95mustanggt- Absolutely. But that would also mean that the engine would have to have been 210 degrees when the KOER test was done. The correct way to perform a KOEO & KOER is to start with the vehicle cold, start the engine and idle at 2000 rpm for 2 minutes. Shut off the engine and do the KOEO test, followed immediately by the KOER test. This way, the engine coolant temp is hot enough to pass the self test, yet cool enough to keep the T-stat closed, maintaining a passing temp. If the engine was at a steady 210 degrees during KOER, the temp gauge would be well above normal. A quick way to check that theory would be to clear all codes, and perform a KOEO self test with the engine cold, and the air temp 65 degrees or warmer. If a code 21 comes up, then the ECT is saying that the coolant temp is below 50 degrees, which wouldn't be true if the air temp is 65 or above, indicating the ECT is reading below actual. This would still trip a code 21 during KOER, though. What was the engine temp when the KOEO self test was done? What was the engine temp when the KOER self test was done? Take care ~Chris ------------------ Retired Moderator MustangNet My site: JimPorterRacing RACECAR spelled backwards is RACECAR HEY !!! Are you ASE Certified ??? If you are, ask me about iATN. The best tool you'll ever have, and it's free !!!