Date: Fri, 29 Jun 2007 08:35:19 +0100
From: johannes <johsnospam-nosspam-42-fitter.com>
Subject: Re: Misfire any thoughts


"Charles C." wrote: > > johannes wrote: > > > > "Charles C." wrote: > >> Charles C. wrote: > >>> Hi, > >>> > >>> The car is 9000, 2.0 LPT, year 1997, 100K miles on the clock. > >>> > >>> It showed some random misfire a week or so ago. Two days later took it > >>> to the SAAB dealer who could not fix (not enough time), but replaced > >>> some split rubber pipes relating to the turbo (?). They think the > >>> misfire relates to the turbo, as it does not supply high enough boost. > >>> > >>> At the time the misfire was only when the engine was under load and > >>> gentle acceleration (town driving). > >>> > >>> ============ > >>> > >>> The car is booked to go back on Tuesday (by which time it may well need > >>> a new catalyst... that will become an email of its own if it does). > >>> > >>> The misfire now happens after about a mile from cold (or a bit sooner) > >>> and it happens even when the engine is idling. I can't see what this > >>> may have to do with the turbo. > >> If it helps anyone out in the future. > >> > >> On 2nd take all problems pointed to fuel starvation which could be > >> caused by a vacuum leak (hence the engine would cut off fuel). The car > >> became difficult to accelerate but reasonably happy to run with a few > >> misfires at a steady load. > >> > >> However, it was the Direct Ignition cassette that was faulty. On 2nd > >> visit to the dealer they chanced that this was the problem. I had done > >> 380 miles with the misfire. The catalyst apparently survived. I am > >> happy to settle for half the SAAB Experience. > > > > 1. Direct Ignition systems are also used by other manufacturers. > Yes. > > > > > 2. They last over 60k miles and replacement is a simple DIY job, in > > fact simpler than changing the air filter (which is tricky on a 9000). > Yes. > > Not sure what you are trying to say. Are you trying to defend SAAB? I > have not complained. Sorry if I read your message the wrong way. > > I am talking about symptoms and how to possibly diagnose the fault if > someone has the same symptoms sometime in the future. Whether the fault > is a good or a bad thing or if we should replace the cassette at 60K > miles as a service item is not something I am passing comment on. > > :-) > Charles I wouldn't go so far as changing the DI as a service item, but keeping a spare is a good idea. You can easily get them for 150 UK Pounds. I was once stranded on a motorway incline and had to be recovered on a lorry. That was very embarrassing, never happened to my FIAT.

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