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Date: Sun, 03 Feb 2002 01:40:42 +0000
From: danny <dannynopsamia-esprezzo.com>
Subject: 9000 intermittent rough idle/stalling


Hi chaps/chapesses Recently my 1990 9000CDS (non turbo) has been idling erratically. It comes and goes, and when it doesn't do it it runs absolutely fine, but the next time you get in the car the idling speed can be all over the place. Actually it tries to idle at 900rpm, but keeps rythmically dropping to nearly stalling then recovering, and after a while it will just stall. Coupled with this is the fact that it now nearly stalls at speed under gentle acceleration, at any speed - you can be driving along and the engine cuts out momentarily then recovers. At lights I have to keep the revs up so that in the dropping phase it stays high enough to not stall. The only thing that has changed on the car recently is that since having a new front exhaust pipe fitted (flexible section from downpipe to cat) it has leaked from the downpipe connection and had to be retightened twice (each time blowing the gasket). Currently there is a very small blow from the join. I checked the engine mounts as a possible source of why the new pipe wouldn't stay connected, but there is no movement in the engine as far as I can tell. Is it possible that the lambda probe possibly getting wrong air measurements due to the small exhaust leak can have this effect on idling? I have checked for vacuum leaks by sight, all seems fine. Any other suggestions? Thanks. -- Regards, Danny http://www.gaggia-espresso.com (a purely hobby site) http://www.dannyscoffee.com (UK advert for my mobile espresso service) swap Z for above characters in email address to reply

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