Modded turbo wagon failed emissions--any suggestions?

[WagonsOnly]

Well, the wagon I bought from Tony failed kinda marginally on hydrocarbon emissions (2-speed idle test since it's dyno exempt) and miserably on CO.

 

My readings were around 300 ppm for hydrocarbons, both tests, and 6% CO during the cruise test. Idle is whatever the car idles at, 1100RPM limit; cruise is around 2500 RPM (close as the inspector can manage). The limits are 220ppm HC and 1.20% CO...I can either pay a $40 fine every 2 years and reregister the car...or get a shop to put $660 into it and qualify for a waiver...or figure out some way to get the darned thing to pass.

 

Any ideas?

 

Thanks...

 

Andrew

[Subaru Jim Maple Ridge]

Thanks for telling us what year and model you are dealing with, but if you could pose the questions more coherently, we'll do more than throw out lame quesses.

[WagonsOnly]

It's an '88 GL-10 Turbo. I failed emissions and need to get the hydrocarbons and CO down below the acceptable limits, as stated above.

 

The two-speed idle test requires the inspector to obtain an average reading from exhaust gases over 2.5 minutes of run time--once at idle, not to exceed 1100 RPM, and once in "cruise" mode at or near 2500RPM.

 

My readings were:

 

Cruise mode:

HC result 295 parts per million

HC limit 220 ppm

Fail

 

CO result: 6.1%

CO limit: 1.20%

Fail

 

Idle mode:

RPMs: 950

RPM Limit: 1100

Pass

 

HC results 264 ppm

HC limit 220 ppm

Fail

 

CO result: .8%

CO Limit: 1.20%

 

As the title suggests the car has a straight 2.5" exhaust on it and a couple of other modifications that will not affect emissions performace. It's had a recent tuneup and the block was built (I was told with emissions in mind) less than 7K ago.

 

Also as the title suggests, it's a standard Subaru turbo wagon...this is the old gen forum, chances are it's an EA82.

 

Finally, what I need to do (I thought this was also pretty clear) is get through a state mandated emissions test, the cheaper the better. If I can't, oh well, I'll just pay the fine and get plates anyway.