MC2 misfires (continued)

[David Michael]

Hmm,

The only other thing that I have found on my car that has caused
mis-firing was a bad Hall Sensor in the distributor - it was sending false
triggers. I finally found it using a portable o-scope....

Dave

On Mon, May 17, 2010 at 4:04 AM, Dag Bøsterud <
dag.boesterud at consulgranada.net> wrote:

> Yes. I have the special tool to measure all pressures (system pressure,
> control pressure,
> residual pressure), and they all check out OK.
>
> As far as I know, duty cycle is another way of checking/controlling co%.
> This has been checked out using the co%-pipe in the engine compartment.
>
> /Dag
>
> 1990 Audi 100 Turbo Quattro Sport Exklusiv
>
>
>
> ----- Original Message ----- From: "David Michael" <
> adavidmichael at gmail.com>
> To: <quattro at audifans.com>
> Sent: Monday, May 17, 2010 2:47 AM
> Subject: Re: MC2 misfires (continued)
>
>
>   Dag,
>>
>> I have not followed the whole thread, but have you verified that the fuel
>> pressure, and more importantly, control pressure are OK? Is he 02 sensor
>> duty cycle OK when the air bypass valve control current is at the
>> specified
>> value (430mv I think)?
>>
>> It is critical to have all of the basic settings correct on the the CIS
>> system before you do any other diagnostics.
>>
>> I have found a few CIS diagnostic flow charts on the web - mostly focused
>> on
>> Volvos. Some of the ones from Bosch are also available online. But either
>> way, its really important for you to read about CIS and learn how it
>> works.
>> Its not intuitive (at least it was not to me), bit once you understand it,
>> it becomes much easier to diagnose,
>>
>> Good luck,
>>
>> Dave
>> 90 200 QA with 240,000 miles
>> _______________________________________________
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>> http://www.audifans.com/mailman/listinfo/quattro
>> http://www.audifans.com/kb/List_information
>>
>>
>
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