Re: Spitting exhaust

["Peter Plangger" <pepe@z.zgs.de>]

Adam,

have you already made a compression test? Maybe a valve or the head
gasket is the culprit.

Peter
_/_/_/_/_/ pepe@z.zgs.de \_\_\_\_\_

-----Ursprüngliche Nachricht-----
Von: LOACESQ@aol.com <LOACESQ@aol.com>
An: quattro@coimbra.ans.net <quattro@coimbra.ans.net>
Datum: Donnerstag, 19. November 1998 23:11
Betreff: Spitting exhaust


>Hi List,
>
>Anyone care to comment on this one?  My 87 5kcst is idling rough and
failing
>emissions with a high hydrocarbon reading (around 450 where the limit
is 220).
>Right now, it has a big red "Reject" sticker on it. The other main
symptom is
>mentioned in the subject line:  the exhaust from the tailpipe at idle
(idle
>speed around 750 rpm) is coming out in forceful bursts, with a
noticeable
>amount of moisture.  It also seems like too much exhaust volume for
that idle
>speed.  I am particularly curious about this.  For comparison, the
exhaust
>from my 89 200q, also an MC engine, is soft at idle, like a hair
dryer set on
>very low speed.
>
>Just installed in the 87 5kcst to try to correct the problem(s),
without
>success: new plugs (Bosch super trielectrodes W7 DTC), new bosch ign
wires,
>new cap & rotor, new bosch O2 sensor.  Also, ISV is clean, air filter
is
>clean, fuel filter recently changed, two 20 oz bottles of Techron
concentrate
>with the last two tankfuls.
>
>I figure the moisture means the catalytic converter is doing its job,
but
>working at overtime.  Could it be the cat is, in fact, dead?
>
>Plug #4 is fouling, evidenced by even, black soot deposits.  New
ignition set
>didn't help.
>
>That's all I can think of.  Thanks for any ideas!!
>
>Adam