Thread: 930 Cutting out
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h2oplr11 h2oplr11 is offline
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Join Date: Jul 2008
Location: Saint Robert, MO
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[QUOTE=mark houghton;4660820]Violent and hard jolt shutdown is not just a stutter or hard miss. Can't miss this overboost protection symptom. Did your boost gauge show you as overboosting? If you were overboosting, then find the reason: look at the wastgate for malfunctioning....either a stuck valve, ruptured diaphram, or disconnected air pressure feed hose. If you weren't over boosting, then most likely it's the boost sensor going bad.
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Mark, I'm having a similar issue to Richard. Definitely the dashboard in the face experience. The background is:

Recent engine overhaul
Replaced fuel filter / accumulator
Electrical - fuel pump regulator replaced

The funny thing is that it happens at 1.1 bar and it has also happened (although less frequently) at .5 to .6 bar. I had an issue this weekend with a squealy fan belt. I tightened it and took it out for a spin. A previous owner had installed a VDO boost pressure guage where the clock originally went. The guage has a historical peak line. Well, it always sat at 1.1 bar. After a little fooling around on the autobahn tonight I noticed that the bar now sits at 1.22 bar. Hope I didn't screw anything up. I definately didn't notice anything wrong on the drive home.

So, I'm wondering 1. if I'm overboosting, 2. if it's a wasgetate issue that you mention above or 3. a combination of both?

Any ideas here? I'm really hoping for an easy, inexpensive fix. Still trying to ease the wife after the overhaul price . . .

Thanks in advance for your help,

Old 05-17-2009, 01:49 PM
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