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Okay, shall warm it up and see what happens.

This morning thought I'd take a quick look. Nothing obvious under the bonnet but a smell of unburnt fuel. I went into OURPUTS on Nanocom and found Timing modulation figure at idle of 93. I see from other threads that this is too high.

Also I unscrewed the replacement filler cap. I wonder whether the filler cap business was just a coincidence. From what I understand, the lack of power will be caused by some problem, and then the computer operates the kill solenoid to stop the engine, so as to make sure no damage is incurred...

Yes, I cleared the faults three times and each time the same fault came back.

Had a break down last night and had to be collected on the back of a truck. This is a diesel P38 from 1998. Going along nicely when after about half an hour she juddered, as with fuel starvation. That got worse and the engine fault light came on, didn't like to accelorate, and then the engine...

Thanks for your answers. That's a relief. It must have got caught in the socket and fallen out without me noticing, as suggested. Only prize I can offer is a morning crawling underneath with me to help grease the propshafts - available to any lucky winner who can make it to Morecambe Bay!

Well, I can't offer a prize, but... Can anyone identify this object? While tapping the spanner to undo the oil filter on our P38 diesel, I heard something fall to the ground. This was under the engine. Clearly a cap of some kind, with 25nm on the front. Is it an essential part of the machine...

Thanks for that - I shall get under and have a good look.

Sounds familiar - I usually remember these things long after they have become unimportant! But actually I shall keep my eyes open for which other cars use the same pressure switch. Update is that the brakes are slightly spongey, so will need another round of bleeding. What joy...!

Yes, thanks, Saab part number 8994071. But I couldn't see a new one available. Will bear it in mind for the future.

Well, I fitted the replacement pressure switch and the brakes are working properly again - at last. I'm a bit concerned that the switch is not available as a new part so we have to rely on used parts taken off scrapped vehicles for something as important as the brakes... but fingers crossed...

Yes, I wondered how to test the switch. I hoped there'd be something in the Nanocom to help but couldn't find anything.

Well today the pump did not come on, and brakes were hardly there, and the ABS and brake warning light were on again. I pumped the brake pedal 30 times, then four more, and still the pump did not come on. Yesterday the pump worked fine, so I have invested in a new (used) pressure switch and hope...

Thanks so much - that's one less possible cause. Shall go and check the others.

Thanks for this. I shall check the electrics again. One other thing is that before I started her and the pump worked again I noticed that I had overfilled with brake fluid almost to the top, so took some out to get down to the correct 'FULL' level. Is there any chance that have an overfilled...

Just changed the brake accumulator on our 1998 diesel P38. We bled the brakes by RAVE and straightaway they were sharp. Went for a run and parked up, but when we came to drive home the ABS pump did not come on, and the brakes were hardly there at all unless you stamped hard and long. Limped home...