Saab 9-5 Engine Surge

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Wed 27 Aug 2003 04:25
Saab 9-5 Engine Surge - red12
I have a 1998 "R" Saab 9-5 2.3 SE Eco LPT saloon (manual)
About 6 months ago the engine started to surge and stutter, usually at about 30 to 40 mph it seemed, and quite often in damp weather. After a couple of attempts, the local main dealer diagnosed a faulty DI cassette and this was replaced. The fault was cured, but now the problem has begun to re-appear. This time it seems to be off power, whilst cruising without too much load on the engine.

Has anyone got any suggestions as to a cause? Is all this going to kill the cat / other parts of my engine?

This car has only done 40k miles and I'd like to keep it, but I'm conncerned that there may be an expensive time-bomb under the bonnet (the fuel guage has also started to fail intermittantly on a sudden basis)

Any suggestions welcomed!
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Wed 27 Aug 2003 07:15
Saab 9-5 Engine Surge - DL
POssibly a Lambda sensor failing......maybe after the stick it took after the DI cassette failed.

For the sake of £100 (??) I'd get it professionally looked at - any SAAB Specialists near to you?
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Wed 27 Aug 2003 08:54
Saab 9-5 Engine Surge - Aprilia
The DI units are not particularly reliable and it is possible that the replacement unit is starting to fail, especially after the recent high temperatures (they are known to fail more often in hot climates).
Other than that it could well be the Lambda sensor, and yes, in either case it won't do your cat any good so get it checked sooner rather than later.
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Wed 27 Aug 2003 09:39
Saab 9-5 Engine Surge - Mike H
Can't help directly, but try posting details of your problem on saabscene.co.uk, there is a 9-5 forum and I'm sure that you will get plenty of ideas!
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Wed 27 Aug 2003 11:53
Saab 9-5 Engine Surge - lordwoody
saabclub.co.uk also have good forums.
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