Vacuum Line sizes...

[Huw Powell]

>>It can't hurt to look this stuff over then:
>>
>>http://www.humanspeakers.com/audi/timing2.htm
>>
>>http://www.humanspeakers.com/audi/tuning-cise.htm
> 
> 
> Done but wanted to do the "easy" stuff first before I
> dove headlong and ignorant into the guts of CIS..too
> many things I could screw up..want to be methodical
> and make sure everything else is operating correctly
> first.

> I agree and I'm not in the habit of doing that but
> these items needed to be replaced anyway.  I checked
> the resistance of the temp sensors and they were shot.
>  The O2 sensor is probably the original and has 20
> years on it..so for the sake of CAN$40...I'll probably
> save that in fuel in a month anyway.  As for the
> decent import parts place, all around here give the
> stunned "wtf" face when I say '86 Audi Coupe.

How about an independent repair shop that looks like it's been around 
for a while?  They would know, or even have the stuff.  I tend to think 
the sizes are 4 mm and 9 mm, but that's a pretty sketchy memory, and 
probably wrong.

>>You also have a lot of molded rubber bits to check,
>>there's one with four ports by the intake manifold
> 
> that is prone to cracking (underneath, usually) with
> age and wear.
> 
> The one holding the ISV?  Seemed fine when I cleaned
> it and the ISV. 

Not the one holding it, the smaller one that is forward of it, is a 
repeat offender.

> Was thinking of trying the
> ether/propane test..never had to do it..adviseable or
> not?

I've tried it with no results, as long as you do it carefully and 
outside, it should be ok to try.

>>You *definitely* should check the CIS fuse - it's
>>the one in the side strip in the fusebox, and often
> 
> gets removed by people thinking it is a "spare."
> 
> Done.  #24 in what should have been #23 but #22 is
> left blank for diesels according to Mr. Bentley.

Yes, good.  To double check it, pull it and make sure it is the 
receptacle that has terminals in it for the fuse.

> Maybe a long shot BUT the car is new to me and the
> Bentley schematics are just that, schematic.

They are good, though, once you get used to reading them.  *Very* handy 
tool, great that you have it on hand.

> I do
> have a weeping/leaking heater core and know that the
> jetronic unit is somewhere in there as well...is it
> possible that coolant got into the unit somehow?

No, not really.  The ECU is mounted to the right side of the glove box, 
the heater core is centrally located, to the left of the glove box.

However, things like windshield leaks could get to the ECU.

Do you have a meter to check the (very low) current to the control 
pressure actuator, and the OXS output voltage, at warm idle?

-- 
Huw Powell

http://www.humanspeakers.com/audi

http://www.humanthoughts.org/