Date: Thu, 9 May 2002 08:18:57 +0100
From: "Andrew Hookins" <andrew.hookinsnopsamamnopsamodata.co.uk>
Subject: Re: My dealer hasn't got a clue, can you help? ('97 9000 Aero, Manual)
Lee Marshalls,
My finger in the air guess is a pressure leak causing the ECU
to either get an incorrect manifold pressure indication, or
something preventing the wastegate working properly.
Has the dealer checked the MAP sensor and that the hose to
this sensor does not have a leak?
Alternatively have they checked the operation of the APC
solenoid and that the hose from the solenoid to the wastegate
does not leak?
Dave Hinz,
Have a look here to see how the DI cartridge / spark plugs are
used sense what is going on in the combustion chamber:
http://www.vehicular.isy.liu.se/~larer/Projects/main.html
Interestingly this control scheme can actually actually adapt to
changes in air humidity because it can 'measure' when peak
pressure occurs.
Regards,
Andy Hookins
<davehinznopsamcop.net> wrote in message
news:abb948$h2gu9$6nopsam34476.news.dfncis.de...
> Someone who looks an awful lot like meme meme
<splitscreen69nopsamsnet.com.au> wrote:
> > A 97 9000 areo have no knock sensor, the ecu detects knock through the
D.I.
> > Knock Sensor has nothing to do with boost, as the ecu retards timing
when it
> > detects engine ping, not boost. I would suggest that the piping to your
APC
> > is incorrect.
>
> So, the DI senses the knock? What, impedance in the combustion
> chamber as measured by the spark plugs, or what? What's the
> sensing mechanism there, and how does that information get fed back
> to the ECU for it to back down the boost? Actually, the theory still
> holds even though the hardware is different - whatever is sensing
> predetonation, or should be, is apparently not doing so. Since they've
> replaced everything involved except possibly the left-rear taillight,
> maybe it's time that they try a DI cassette.
>
> Dave Hinz
>
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