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B.
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Reged: 18/08/2002
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Posts: 13274
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Loc: Österreich (Graz)
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Re: A drowning V8 with a G40 error (motronic problem)
[re: Lars Bak]
09/10/2006 01:33
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Hi,
yes, I mean the Throttle position sensor - thanks  .
Well, just a guess, but the idle-regulation valve in front of the engine closes when the throttle valve opens (when accelerating) and starts to regulate again when you take back the throttle. So, what if the mechanical connection (isn't it a flexible shaft?) between the throttle sensor in front of the engine and the throttle valve at the back of the engine is well indeed, but the throttle valve itself is broken?
Just imagine: You accelerate, the throttle sensor measures acceleration, the Motronic closes the idle speed valve in front, injects fuel but: no fresh air is taken in cause the throttle valve remains closed due to a mechanical defect! It nevertheless doesn't explain why you have the G40 in your fault memory, but that could be another problem. It's worth a look!
By the way: The G40 and faults in relation to it seem to have very different effects - Thomas Müller here in this forum e.g. drove around without the Hall-Sensor even connected and it worked quite properly. A mate of mine found a defected Hall-Sensor as reason why his V8 even wasn't able to start up any more!
My guess is, relying on the Self-Study-Programs of the Audi V8 which say that the Hall Sensor, Ignition point sensor and flywheel sensor are together part of a redundant self-healing system, that it depends on the condition of the other sensors how a defective Hall sensor results.
Do you have the Self-Study-Programs for the Motronic and so on? If not, send me a private message including your mail address and I'll pass them to you.
Yours
Bastian
Das Buch zum Audi V8
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