cold start? warm start?

[Huw Powell]

> My 86 5ktq (MC engine) has been reluctant to start, especially with a
> cold engine on warmer days.

> Questions:
> Is the two wire thermoswitch for the idle stabilizer?

probably, sort of - it tells the ecu if the engine is cold/warm/hot.
though don't take my word on that, CIS-turbo is not really my area of
expertise.  Some might ask, well, what is, then?  Hmmmm....  I do know
the names of a lot of colors!

> What about the big scary temp sender under the coolant pipe?

those go bad routinely, they drive the coolant temp gauge, the overheat
warning (same circuit?) and tell the A/C if the engine is too hot.

> Is there a thermo-time-switch on this car?

if it has a cold start valve it should have one.  usually a two pin
connector in the back of the head.  But I'm not sure, on the MC.

> If I attach a VW 1367 "according to manufacturer's instructions" what
> is the duty cycle that I would measure?

frequency valve duty cycle?  at warm idle it should fluctuate around
50%, but some set it a little rich to help make things a bit richer when
cold and at WOT - that would mean a slightly lower duty cycle.  again, I
may be wrong here too, regarding the MC engine...

> Is the Bentley manual really that much better than the Haynes?

Yes.  It's like having an encyclopaedia instead of a pocket dictionary.
The Haynes does take up less space, and often will seem to have
information relating to your car - just enough to screw you up.

--
Huw Powell

http://www.humanspeakers.com/audi/

http://www.humanthoughts.org/