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  #31  
Old 10-15-2013, 12:27 PM
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Passed on my first try this year
Myself and Treeroot cleaned the MAF,changed the oil,changed the air filter and ran a couple bottles of Red Heet with 91 octane.
Also I think it helped that it was around 40 degrees out.
(Sorry for the sideways photo) Darn iPhones.
The truck has never ran better.
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  #32  
Old 10-15-2013, 07:49 PM
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Nice!!
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  #33  
Old 10-26-2015, 10:59 PM
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Default Here we go again....

So it looks like a new failure has popped up this year.
CO GPM and HC are very high numbers.
Did all the normal things. Cleaned the MAF, ran a bottle of Red HEET.
New air filter and gas cap....
Cleaned up the distributor. Also checked the timing and it is still spot on.
Looks like this failure is a pretty solid failure.
Also they managed to get the truck to throw a CEL 25 during the test.
Any advise?
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Last edited by Snowrun; 10-26-2015 at 11:20 PM.
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  #34  
Old 10-26-2015, 11:03 PM
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Newer cats or O2 Sensors. If not one of those probably would do the trick. The numbers to me make me think you could slide with O2 sensors but hard to say if you might need both? Didn't see how many miles on the 94? Edit just saw the miles. 243 and some change. Nicely done. :-)
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  #35  
Old 10-27-2015, 07:20 AM
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The two O2 sensors and the two new cats have 57000 miles on them and have been installed for four years. I'm wondering if his truck has always ran lean for some reason and the cats worked to mask the high CO numbers. Too expensive to swap cats every two years.
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  #36  
Old 10-27-2015, 07:26 AM
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Simps80 and I changed the MAF last night. (just because we had a spare). It seems to run a lot cooler. I am planning on getting under the truck today and looking at the harness wires going to the O2 sensors. I am seeing a few post on mud about wires having issue. If that checks out I am going to see about getting a couple new o2 sensors.
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  #37  
Old 10-27-2015, 08:57 AM
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My failure is on high nox, with new cats and EGR valve. See below link.

http://www.risingsun4x4club.org/foru...755#post275755
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  #38  
Old 10-27-2015, 04:16 PM
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New MAF sensor

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  #39  
Old 10-27-2015, 07:30 PM
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Pulled the intake plenum off the 80 today. EGR port was solidly plugged with carbon.
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  #40  
Old 10-27-2015, 07:34 PM
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Quote:
Originally Posted by bruce285 View Post
Pulled the intake plenum off the 80 today. EGR port was solidly plugged with carbon.
Do you have emissions measurements before and after?
It would be interesting to see what effect it has on the numbers.
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