Date: Thu, 21 Jun 2007 20:20:42 GMT From: Paul Halliday <pjghnospamyonder.co.uk> Subject: Re: Misfire any thoughts
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? > 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 :) > 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. > BTW. Are the recommended sparking plugs for the car NGK or Champion? NGK ... Without even thinking about it! 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, Paul 1989 900 Turbo S http://saab.go.dyndns.org/
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