Date: Mon, 17 Nov 2003 09:04:19 +0000 (UTC)
From: "Saabtech" <saabtechnopsamnnect.com>
Subject: Re: EGR Valve


"Paul Halliday" <pjghnopsamyonder.co.uk> wrote in message news:BBDDA169.B128%pjghnopsamyonder.co.uk... > Good eve' fellow Saabers, > > I'm really not happy with the way my EGR vac pipes are setup on my 1989 900 > T8. Pre-throttle, I have one take-off which runs across to the distributor > capsule (I think that's the right word - this is the "vac advance" thingy, > right?). I'm sure my old '88 900 T8 had two pre-throttle vac take-off > points. > > This pipe has a T in it which goes to the two prong EGR temperature > sensor(?) between number 2 & 3 cylinders. > > I can't help thinking, but correct me if I'm wrong, that the point of the > pre-throttle take-off is to push boost across to the distributor capsule. > But, surely this is also the pipe that re-circulates gas back into the > pre-throttle. If the engine is under boost, this pipe will be blowing from > the pre-throttle intake and therefore the EGR pipe will have no chance of > re-circulating gas. It may be purely intellectual, but that can't be right. > If it's not right, then I should do something about it :) > > I gather the EGR valve starts operating at about 2100 RPM. I'm often > starting to go into boost by this point, with the boost gauge at the broken > white part, so presumably gas is only re-circulated for a brief second on > each gear change. Okay, I appreciate that it can be quite happily running on > a motorway cruise, but I rarely do that kind of driving and spend probably > 90 percent of my time either in start/stop city traffic or cranking between > third and fourth on country lanes, turbo whistling away. > > I've been reading that Saab removed the EGR system from later cars. Can, or > rather more importantly, should I disable the system? I've read a lot of > opinions on a couple of forum boards, but I'm a lot more confused now about > whether I should and how to do it. I also read that the UK MOT is a lot more > harsh over emissions and a correctly setup T8 will fail anyway, so > disabling/removing the EGR system is not really a great issue. Besides, the > more I "turbo", the more I'm cleaning the air anyway :) > > How would I disable the system? Logic dictates that I should simply block > off the vac pipe that runs to the pre-throttle position. Later, I can get a > take-off cap to put on the EGR pump(?) under the intake manifold and remove > the sensor (between 2&3 cylinder) and block up with a bolt of the right size > and thread. > > Opinions and advice would be very much appreciated. > > Paul > > 1989 900 Turbo S > http://saab.go.dyndns.org/ The best thing to do with the EGR is to remove said article alltogether, You will probably find that the valve itself is corroded to the point where it does not function anyway. If you want a tidy job you will need 8123747 or 8123739 plug for the exhaust manifold and 7563042 for the vacswitch on the inlet side. Use the egr valve as a template and cut out a piece of tin or ally sheet to make a blanking plate, gasket 7507923. Removing the EGR makes the car more driveable and will not cause a problem with the emissions test and in a lot of cases will acctually improve the situation. HTH Tom.

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