Do anybody know off the top of their head the resistor value needed to trick the EOT to do a contribution test on a bold engine?

Thanks in advance

 

Bill might Know

 

I believe a 5.4kohm resistor will give you an EOT of 160, which should work for the CCT, but if it's really cold, might make starting a tad difficult.

 

Could always hook up a variable resistor dial, then after the truck is cranked turn it up until your scanning software sees > 167 degrees EOT.

Or just unplug it. The PCM will see a default EOT for cranking of 68 degrees, then a running EOT temp of 212 degrees. However, I'm not sure if it will complete a CCT test with the EOT unhooked or not. Some scan tools work like that. Worth a shot though.

I'm guessing you have cold running issues or a severe miss that you are trying to track down?

 

I don't think the CCT can be run with the EOT unplugged. Since the PCM doesn't allow the test to be run on a cold engine, I don't think the scanner type makes a difference.

 

Thanks for the replies guys. I figured it out. Tried with EOT unplugged and though it read 205 of the scanner it wouldn't run it the CCT. put in a 4.7K and that put it a 163 and it let me run the CCT. Working on a early 99 with dead misses. Just didn't want to warm the engine up again cause I was heading toward compression tests and swapping injectors around to verify. Nice cool engines are much better to work on.

thanks for the info!