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Date: Thu, 10 Aug 2006 05:45:47 +0100
From: "DervMan" <thedervmannospaml.com>
Subject: Re: Okay now I *know* this isn't me...


"Tim (remove obvious)" <the.NOfarmSPAMnospaminternetSPAM.com> wrote in message news:s5udnX4rqLL59UfZRVnyrwnospamom... > > "DervMan" <thedervmannospaml.com> wrote in message > news:44da3bc6$0$26594$da0feed9nospam.zen.co.uk... >> "Pete Smith" <pete_newsnospame.org.uk> wrote in message >> news:MPG.1f442a771804dc5798992fnospamet.plus.net... >> In article <44da1729$0$30329$fa0fcedbnospam.zen.co.uk>, >> thedervmannospaml.com says... >> > I've only had my 2000 Saab 9-3 2.2 TiD since early June, so I'm still >> > getting used to it. This is the first TiD engine used in the 9-3, the > 2.2 >> > 115 bhp one. I'm using it in conjunction with one of these fuel pump >> > modification units (and it makes a huge difference to acceleration). >> > >> > I've driven and owned all sorts of turbodiesels and in all they've >> > performed >> > better in cool, foggy conditions and not so good when it's warm. Okay >> > until >> > the last week the temperature has been pretty much over 28°C and it's > been >> > especially humid. Now it's cooler and the car feels much, much > better... >> > >> > With this 9-3 the difference between cooler air and warmer is >> > *immense*. >> > If >> > it were a petrol, it feels like it's under-intercooled and the ECU is >> > limiting boost to prevent engine knocking. >> > >> > Is this a known first generation 9-3 TiD issue? Is the intercooler >> > just >> > too >> > small? Could there be a loose pipe instead? >> >> In that last really hot weather (35 degrees), my TDCi was definitely >> sluggish. >> >> The symptoms point (IMO) to a fault in the firmware, because others were >> reporting the same problem. >> >> Basically, as soon as you hit 3k in 3rd or 4th (I wouln't know about 5th >> ;-), the power would drop right off until 3.25k, and then take off >> again, but quite sluggish. >> >> Now the weather's cool, it's back to normal. >> >> >> *-*-*-* >> >> Ding, just about - except I so rarely exceed 3,000 rpm I can't confirm >> otherwise... > > I would suspect that the intercooler is marginal, and if you set up a > logger > on the charge temp vs boost pressure you will see 60+ deg c charge temp > and > the ecu pulling boost back. > > This'll be your problem. Goodo. Time to use my OBD-II scanner again then! :) -- The DervMan www.dervman.com

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