Need help, anyone with a CIS degree and familiar with Audi ignition systems

[Huw Powell]

> Okay....
> 
> So it will start and idle and it idles okay but a little rough
> because I have a blau cam...  The problem is that it won't rev...  It
> will go up to 2k then it falls and will bounce between 1300 and 1800
> with the throttle open.   I also hear a vacuum leak someplace towards
> the front I think from a line but not entirely sure.  I am wondering
> if possibly it just has to have the later style ignition stuff or
> maybe the old coil isn't as good as I thought...    A couple of wierd
> things are that I am using a Mitsubishi Throttle body and it doesn't
> have wide open throttle switch at all...  Not sure if that will
> affect anything..
> 
> Any new thoughts?

Hey Matt,

Yeah... first, please keep the conversation on the list (use "reply 
all").  This allows others to learn if we convey something useful, and 
to correct if we get something wrong.  Anyway...

One thing that could cause that 1800 rpm (or so) brick wall is a closed 
idle switch.

Also, if you so much as suspect a vacuum leak, try to find it (them) and 
fix it first.

Where is your ignition timing set?

>> I was falling asleep last night while I was writing that so let me 
>> explain a little more clearly. Instead of using the pin style coil,
>>  cap, rotor and wires. I swapped in all the other style components 
>> from my 83 CGT (cap, rotor, wires, coil.) I am wondering though if 
>> there is something different between the 83 gt and the 85 4kq that 
>> requires the 4kq to have the pin style instead of the earlier
>> style. I'm not mixing components, I just replaced the worn out
>> later style with virtually new earlier style stuff.
> 
> 
> Ah, ok, then you should be fine. The "old style" wires work on either
>  style dist. cap, if I recall correctly. The "new style" wires won't
>  make contact in the old cap/coil.
> 
> 
>> Also, am I correct in assuming that the injectors wont know which 
>> port they are attached to on the CIS head. The cold start injector 
>> is attached to the original port on the side of the head but all
>> the other ones are in different places because I turned the CIS
>> unit around Urq style.
> 
> 
> You are correct, they all get the same pressure as each other, all
> the time.
> 
> 


-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/