Cold Engine contribution test
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Post Fiend
Joined: Apr 2004
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From: Silver Lake Dunes, MI
Cold Engine contribution test
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
Thanks in advance
Post Fiend
Joined: Jun 2004
Posts: 9,293
Likes: 10
From: Parker, CO
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?
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?
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Post Fiend
Joined: Apr 2004
Posts: 12,835
Likes: 3
From: Silver Lake Dunes, MI
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!
thanks for the info!
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