Audi 100 Questions

[Ben Doughney]

Hi all,

I bought a 1986 Audi 100CS Quattro last week and it has been running 
well so far, except for a few problems.

When it is cold it won't idle at all, I have to hold my foot on the 
accelerator for the first couple of minutes. It is also hard to start, 
it takes quite a bit of cranking before it fires, on my other Audi it 
starts on the first turn of the engine.

Also, the other day, while I was driving down the motorway, it got hot 
and started to knock, but hasn't done it since so I am not sure what 
caused it.

I had a look around in the engine compartment and fixed the breather 
hose which was all rotted out. All of the other hoses seem fine.

How do I check the mixture on this engine? My 90 has a plug that I can 
use to check the duty cycle for the ISV, but I can't find a plug on 
this engine. Do I just use a fuel air meter? I will have to also check 
the timing at the same time and change the plugs and air filter as 
well.

I am a bit concerned about the engine knock- anyone have any ideas what 
would cause it? The power dropped right off at the same time.

TIA,
Ben Doughney

'71 VW 1600TL
'65 VW 1500N - Val
'66 VW 1300 Aussie Beetle
'64 VW Kombi project
'70 NSU Ro80
'71 NSU Ro80
'85 Audi 90 2.3E Quattro
'86 Audi 100CS Quattro

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