CEL light when idling - Defender Source
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  #1  
Old May 6th, 2010, 01:19 PM
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Robert Lynch
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CEL light when idling

does anyone have any input on this.

I get a check engine light when i idle for say 5-10 minutes (stationary, say when i'm on the phone etc.)

it glows a steady red and does not blick, i have not had the chance to see if there are any codes showing when it does this.

Pulling power for 30 seconds clears it and it does not reappear until i idle again.

O2 sensors maybe on thier way out? something else.

doesn't seem to be something that i need to worry about other than my OCD for things working right.

the engine is stock 3.9 gas, with stock exhaust and Cats (97K miles) just did a recent (~2k miles ago) large service with no issues, no leaks except for 1-2 drops every few days from the Rear Main seal (engine to tranny junction)
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  #2  
Old May 6th, 2010, 02:12 PM
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What code does it throw on the code reader. It is the little black box under the PS seat.
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  #3  
Old May 8th, 2010, 12:36 PM
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It is a code 44

o2?
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  #4  
Old May 8th, 2010, 01:53 PM
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Yup.

http://www.robisonservice.com/servic...er_trouble.asp

Make sure you don't have a vacuum leak or something, but in my experience if the O2s are original, they have just gone bad. Buy a pair of new OEM from roverguy.com (and tell Will I said hi).

Ron
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  #5  
Old May 8th, 2010, 02:33 PM
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Robert Lynch
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Check just ordered a set from ab before I saw your post
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  #6  
Old May 8th, 2010, 05:45 PM
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Those are fine too and AB is a good vendor, Eric is great and supports the community, and has a good price (just $15 a pop more than Will is all).

Ron
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Old May 14th, 2010, 12:45 PM
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Robert Lynch
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thought i would update everyone (who cares anyway)

Ordered the 2 lamda sensors from AB ~220 shipped with express 2 day freight.

Install is simple and straight forward took about 30 minutes for both due to a zip tie that I put in earlier when i did hte winch wiring. Other wise should only take 20 minutes or so as long as your old ones come out neatly (i.e. you did use anti-seize right? you need to).
The new ones from AB came precoated with high temp anti seize as well. so unscrew, cut the 2-3 zip ties and unplug the old ones and reverse for the new ones.

Verdict: huge improvement in drivability and smoothness, My gas mileage seems to have increased as well but the verdict is out on that until i run this tank out and track the next one. (was apx ~170 miles to 14.5 gal prior to this, about 11.7 mpg in other words), this seems to indicate a rich condition existed due to the lamda (O2) sensors).

I am speculating that i might pick up 2-3 mpg from the new sensors - but that is pure speculation at this point until i can track it accuratly.

the truck runs better than ever (knock on wood!!)

thanks for the help.
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  #8  
Old May 14th, 2010, 12:59 PM
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Glad it seemed to work out.

Ron
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