emissions repair questions for an 87 5ktcs

[Enzeder]

Hi Dave,
         welcome to the club.

I'm not 100% sure, but I think idle spec is 800 ± 
50 RPM, so you aren't that far out of spec 
(assuming you have a manual trans).  With an auto 
the idle spec is 720, so you'd be right on.

I'm not a guru, but I'll try and get the ball rolling:
Hi CO indicates rich running.  Leaky injector?  Leaky cold start injector?
Maybe add a couple of gallons of race gas to a low tank?

I'm not sure what .5 limit is.  But page 25.25 of 
the Bentley says spec for CO is between 0.3 and 
1.2% volume with O2 sensor connected.  And there 
is a CO adjustment procedure, but I've never done it, or had a need to.

Later,
Arryn


At 02:14 PM 5/2/2008, Dave Yentema wrote:
>Well first off, just wanted to say hi to all of 
>you, as this is my first submission on here.
>
>I've got an 87 5ktcs that i just went to take 
>through inspection today, and it failed for CO. 
>The standard is .5, and i failed with .56. The 
>other numbers are 78 for HC (standard is 100) 
>and 9.7 for CO2. I hav been trying to get this 
>car inspected since december, when it failed for 
>having a bad headlight. Since then everything has went wrong.
>
>I just had a 3in catback system done w/ a catco 
>cat and summit race muffler, did a tune up a few 
>months ago and for the most part the car runs 
>great.  It does idle low every now and then, the 
>inspection place documented my RPM at 727.
>
>The car has no codes at all.
>
>Any help would be awesome,
>
>Dave
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