emissions repair questions for an 87 5ktcs

[Enzeder]

Wouldn't a vacuum leak create a lean condition (and low CO, but high 
other stuff) as unmetered air is sucked in?  If George is right, and 
I'm wrong, then you should also check the underside of the michelin 
man hose (intercooler to intake).

Oh, and take a cruise through this site... starting here:
http://www.sjmautotechnik.com/trouble_shooting/boost.html#mixture

Later,
Arryn


At 08:48 PM 5/2/2008, George wrote:
>I would suspect a vacuum leak to start with.  I just went through an
>emissions test on my '91 200 20 valve, and ended up replacing all the vacuum
>hoses to fix the problem.....
>
>George Sidman