emissions repair questions for an 87 5ktcs

[Huw Powell]

> Do you mean the ISV (Idle Stabilization 
> Valve)?  Possible I suppose 'cause that sucks in 
> metered air.  Easy to clean, but cleaning always 
> seems rather temporary. However, replacement was 
> expensive so I lived with the occasional stall 
> you describe because as you noted, once running it was like a top.

No, they mean the "CSV" - the "cold start valve" - the "sixth injector", 
that briefly activates when the engine is cold to richen the mixture.

Not to be too peremptory, but they are *never* the problem.

> At 04:21 PM 5/3/2008, Dave Yentema wrote:
>> 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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>>> quattro at audifans.com
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-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/