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Date: Sun, 03 Feb 2002 02:24:49 +0000
From: Johannes H Andersen <johsnopsamanytime.co.uk>
Subject: Re: 9000 intermittent rough idle/stalling


danny wrote: > > 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. For vacuum leaks, check also small (signal) hoses from manifold. Could be the head gasket starting to crumble. You have probably already thought about that. The main reason that I suspect this is that my car had the same symptoms about 3 years ago. The Saab dealer replaced the head gasket, but did no have to do any skimming because I came in early. Do you also get CHECK ENGINE? Diagnosis via code socket. Johannes

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