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Discussion Starter #1
Hello All,
New subscriber to the forum, glad to be here.

I have a 2000 Outback 2.5 SOHC M/T that just got out of the shop for a transmission swap, and took it over to the Colorado Emissions, and failed miserably..

The numbers were as follows:
HC Actual 2.82 Limit 1.2 FAIL
CO Actual 141.67 Limit 15.00 FAIL BIG TIME
NOx Actual .0384 Limit 2.0 Pass

Wondering if anyone out there has any ideas on what could be causing this big of a variance.
Just did NGK Spark Plugs and wires, fresh oil change..
They also did timing belt while it was in the shop, tensioner, water pump etc...

Any Ideas would be welcome
Thanks in Advance!!!
 

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2000 Outback Wagon Limited Automatic
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10 Posts
Sounds like a cat converter, since your failing in all 3 categories! Can anyone reconfirm my suspicion?
 

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2001 VDC/SC One of a Kind
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14,289 Posts
The numbers were as follows:
HC Actual 2.82 Limit 1.2 FAIL
CO Actual 141.67 Limit 15.00 FAIL BIG TIME
NOx Actual .0384 Limit 2.0 Pass

I think you got the numbers mixed up.

HC would be the 141.67, which is unburned fuel reaching the tailpipe.
CO is 2.82, carbon monoxide readings which at this level could indicate a vacuum or exhaust leak. Does the report give you the O2 content measurement?
NOx is oxides of nitrogen. With the NOx this low, the CAT is working, but can't keep up with the rich condition coming from the engine exhaust.

Here's what to look for. Condition of the plugs, thermostat operating to reach proper temperature, vacuum leak, exhaust leak (especially since the transmission was out) and if possible, drive it around until the MIL comes on and post the codes.
 
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