New thermostat & now "Check Engine" light - JeepForum.com

 
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post #1 of 8 Old 12-31-2013, 06:03 PM Thread Starter
MLaborde
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New thermostat & now "Check Engine" light

Got in late this afternoon & put in my thermostat with new gasket, & bled the air out of the system. At some point during the warm-up/bleeding, the CEL came on.

I've disconnected the battery and will reconnect in the morning to see if it stays on. I will update the thread with results in the morning.

I've replaced this t-stat 2x but this is the 1st CEL I've had. Ideas?

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post #2 of 8 Old 12-31-2013, 06:12 PM
JBTJ
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Quote:
Originally Posted by MLaborde View Post
Got in late this afternoon & put in my thermostat with new gasket, & bled the air out of the system. At some point during the warm-up/bleeding, the CEL came on.

I've disconnected the battery and will reconnect in the morning to see if it stays on. I will update the thread with results in the morning.

I've replaced this t-stat 2x but this is the 1st CEL I've had. Ideas?
Only needs to be disconnected for a few minutes. Can't imagine why you would have a CEL with what you did. Are you sure all electrical connections are made?
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post #3 of 8 Old 12-31-2013, 06:17 PM Thread Starter
MLaborde
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Originally Posted by JBTJ View Post

Only needs to be disconnected for a few minutes. Can't imagine why you would have a CEL with what you did. Are you sure all electrical connections are made?
I disconnected the temp sensor plug while I was working but I've done that every time. It plugged back in fine.
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post #4 of 8 Old 12-31-2013, 06:20 PM
JBTJ
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Originally Posted by MLaborde View Post
I disconnected the temp sensor plug while I was working but I've done that every time. It plugged back in fine.
Go connect the battery back up and see what happens. It's been disconnected long enough now.
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post #5 of 8 Old 12-31-2013, 06:31 PM Thread Starter
MLaborde
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Originally Posted by JBTJ View Post

Go connect the battery back up and see what happens. It's been disconnected long enough now.
Just did. All clear so far.

Letting it warm up to check for leaks again while I'm out here in tbe cold already.

Thanks for the help the last couple of days. Much appreciated!
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post #6 of 8 Old 12-31-2013, 06:34 PM
JBTJ
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Originally Posted by MLaborde View Post
Just did. All clear so far.

Letting it warm up to check for leaks again while I'm out here in tbe cold already.

Thanks for the help the last couple of days. Much appreciated!
No problem, hope you got it fixed this time. Don't freeze to death.
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post #7 of 8 Old 12-31-2013, 09:49 PM
mrblaine
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Quote:
Originally Posted by MLaborde View Post
I disconnected the temp sensor plug while I was working but I've done that every time. It plugged back in fine.
If you cycled the key to the RUN position with the temp sensor unplugged, you will throw a CEL that will go way after a few start cycles.

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post #8 of 8 Old 12-31-2013, 10:00 PM Thread Starter
MLaborde
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Originally Posted by mrblaine View Post

If you cycled the key to the RUN position with the temp sensor unplugged, you will throw a CEL that will go way after a few start cycles.
I'm sure thay was probably what I did. Good to know for future reference. Thank you!
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