Bernard Littau bernardl at
Fri Apr 5 11:03:48 EST 2002

I remember when the 320i first came out, BMW was ridiculed for its
engineering expertise in re-inventing vapor lock as a common problem.

All the manufacturers suffer team doorhandle type problems from

I find the stock CIS to be generally very reliable, but you can't defer
maintenance, and you have to fix the small problems before they become big
ones (injector cooling sensor, for example).  My '88 5ktq starts better cold
and hot than just about any car I have come across (naturally, it sucks
starting warm, but I am working on that!).  By now, my '88 CIS has had most
of the sensors and "soft" parts, like the injectors, exceed their MTBF.
I've replaced most of those parts, and will soon do the rest.  Once I do
that, I expect it will function flawlessly for a long time.

Bernard Littau
Woodinville, WA

> Which problems are you referring to? The stock CIS setup seems to hold
> up fairly well, even in the turbo cars. Granted it may not be the *best*
> implemetation, but is generally a rather reliable one. If you are
> reffering to vapour lock, or something other heat related, then yes, and
> CIS style system can suffer from the same ailments, given the needed
> circumstances (dead/lack of  injector cooler for example), with audi's
> setup placing it(the turbo) right under the CIS metering head and fuel
> lines, there is more of a chance for said vapor lock to occur if the
> cooling system for the injectors fails.
> >Hi All-
> >quick question-
> >do other cars (old Porsche, MB, BMW) with CIS have have the same
> or similar
> >problems as the Audi turbos?  If not, why?  Is it due to the
> high operating
> >temps of the turbo engines?  Just curious.

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