Date: Fri, 22 Jun 2007 01:22:07 +0100 From: "Charles C." <c.k.christacopoulos.removeme.nospamee.ac.uk> Subject: Re: Misfire any thoughts
Thanks to both of you ... Paul Halliday wrote: > in article 467ac7cb$0$31684$db0fefd9nospam.zen.co.uk, Charles C. at > c.k.christacopoulos.removeme.nospamee.ac.uk wrote on 21/06/2007 19:46: > >> The car is 9000, 2.0 LPT, year 1997, 100K miles on the clock. > > So ... Direct ignition? Red cassette? Of course Red :-) > >> 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. > > An air leak with increases with load or becomes apparent with a throttle > blip and engine movement is always a tough one to track down. > >> At the time the misfire was only when the engine was under load and >> gentle acceleration (town driving). > > Sounds like the DI cassette ... What do others think? > >> 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. > > Sounds like the DI cassette :) This is my thought too ... I suspected it before I took the car to the dealer but ... at the time it did not (or I could not feel) the misfire when idling. > >> Any ideas, what it may be or which is the best way to identify the problem? > > Are you a late victim of the recent lambda poisoning issue with fuel in the > SE of England? It seemed that Morrisons and Tesco were the main culprits, > but other stations did give out fuel which caused lambda fogging ... This > was a good few months ago, but maybe you've not used your car much. No. The fuel has been from Sainsbury's or Shell and in always super unleaded. > >> BTW. Are the recommended sparking plugs for the car NGK or Champion? > > NGK ... Without even thinking about it! I do not know what is there ... but SAAB had said they were fitting some 3 point Champion plugs (I remember them around £25 at Halfrauds) which were good for 3 years or 36K miles (if memory serves me right). > > Does someone live near Charles who could lend him a spare DI cassette to > test out the theory? They're quite expensive and mentioning it to a garage > would simply result in a swap, a large bill and possibly not fix the > problem. > > One trick is to pop down to Halfords, buy a can of carburettor cleaner, warm > up your engine and spray the fluid over vac pipes, where pipes are clipped > onto metal and any other union or orifice that looks dodgy. Spray into areas > that move when the throttle is blipped. If the engine increases in pitch > noticeably, you've likely found an air leak. > > Happy hunting ... Come back with more questions if you have them, I will ... I am in new territory. > > Paul > > 1989 900 Turbo S > http://saab.go.dyndns.org/ > -- Please remove _removeme_ to reply.
