Cleaning EGR Valve

[John Cody Forbes]

An EGR valve is two separate chambers separated by a diaphragm. Spraying into the vacuum port will get you nowhere expect possibly destroying the diaphragm depending on the chemicals used. You'll need to take it off and most likely scrape the carbon buildup with picks and screwdrivers followed by some chemical help. You'll also want to clean whatever it attaches to (I've never seen a type 44 with EGR).

Exactly what car and engine are we talking about here?

-Cody (mobile)

On Nov 27, 2010, at 1:12 PM, "mboucher70 at hotmail.com" <mboucher70 at hotmail.com> wrote:

> Anyone know if the EGR valves on the type 44's could be cleaned out with 
> Carb cleaner in the same way that ISV valves often can be?  If so, might it 
> be possible to simply spray the carb cleaner into the vacuum hose connector? 
> I know that ideally its best to get it out and soak it overnight in carb 
> cleaner but the EGR valve looks look like it can be removed very easily.
> 
> Thanks for any thoughts
> 
> MC
> 
> --------------------------------------------------
> From: <mboucher70 at hotmail.com>
> Sent: Wednesday, November 24, 2010 10:49 PM
> To: "John Cody Forbes" <cody at 5000tq.com>; <quattro at audifans.com>
> Subject: Re: What was the Verdict on the Intermittent "Check Engine 
> Light"Problem
> 
>> I just pulled the ECU codes.  It has only 2 codes stored:
>> 
>> 2411 which means: 1989-91 Audi 100 only Exhaust Gas Recirculation Valve,
>> (California Vehicles only)
>> 2132 which means: 1989-91 Audi 100 Only Data Wiring Defective, check 
>> wiring
>> (California Vehicles only)
>> 
>> 
>> The EGR valves sell for about $300...I know that for many cars, the EGR
>> valve can be cleaned with Carb cleaner (just like the ISV valves on type
>> 44's).  Anyone know if these EGR valves can also be cleaned with Carb
>> cleaner?
>> 
>> As for the 'data wiring defective, check wiring' ...wow, there's a 
>> hornet's
>> nest...Any ideas where to start with that one?  I know that the original
>> factory radio had a 'data' wire which was left unplugged after installing 
>> an
>> aftermarket radio...that couldn't possibly be the 'data wiring' its
>> referring to could it?
>> 
>> Thanks again
>> 
>> MC
>> 
>> 
>> --------------------------------------------------
>> From: "John Cody Forbes" <cody at 5000tq.com>
>> Sent: Wednesday, November 24, 2010 9:59 PM
>> To: <mboucher70 at hotmail.com>
>> Cc: <quattro at audifans.com>
>> Subject: Re: What was the Verdict on the Intermittent "Check Engine Light"
>> Problem
>> 
>>> The CEL can come on intermittently for dozens of reasons. Common ones are
>>> knock sensors and vacuum leaks on the turbo cars. Did you pull the codes?
>>> That's a good start.
>>> 
>>> -Cody (mobile)
>>> 
>>> On Nov 24, 2010, at 7:30 PM, "mboucher70 at hotmail.com"
>>> <mboucher70 at hotmail.com> wrote:
>>> 
>>>> I recall reading many postings years ago concerning the 'check engine
>>>> light' on the type 44's (late 80's to mid 90's?) coming on
>>>> intermittently, and the cause was usually the oxygen sensor.
>>>> 
>>>> Was the consensus that
>>>> a.) the oxygen sensors were failure prone and just needed to be replaced
>>>> frequently or
>>>> b). the check engine lights/O2 sensors were overly sensitive and would
>>>> flash on with small atmospheric changes or
>>>> c.) something else
>>>> 
>>>> MC
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>>> 
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