emissions repair questions for an 87 5ktcs

[Dave Yentema]

I was wondering if perhaps it was the CSV, because when the car sits for a 
while, i'll go to start it and it fires and then dies shortly thereafter. 
it'l start right back up and run fine after that though.
----- Original Message ----- 
From: "Enzeder" <enzeder at comcast.net>
To: "Dave Yentema" <yentemad at rider.edu>; <quattro at audifans.com>
Sent: Friday, May 02, 2008 8:32 PM
Subject: Re: emissions repair questions for an 87 5ktcs


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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