Date: Fri, 10 Oct 2003 13:24:49 -0400
From: fristnopsamt.edu (Ramsey Frist)
Subject: Re: 9000CSE at 2200rpm


In article <dFAhb.33$ca2.123744nopsamfep1-win.server.ntli.net>, "SAABurger" <furnyburgernopsamorld.com> wrote: > Ramsey, > I posted to this group yesterday (see thread "2.3 liter hesitates on > acceleration") explaining how an exhaust leak was causing my problem, and > how a new front section of exhaust cured it. > > What I didn't say in that post was that the hesitation was strongest when > accelerating through about 2000 rpm. The difference between your 2200 and my > 2000 rpm could be accounted for by our engines being turbo and non-turbo > respectively. For me, the discontinuity was very marked just before I had > the exhaust replaced, but gone completely as I drove home from the > exhaust-centre. > > It is my guess that there's a discontinuity in the fuelling logic at about > 2000 and that this normally unobservable artefact becomes imperfect when the > lambda sensor (which monitors oxygen level in exhaust gasses) is confused by > a leak. > > From my experience I would have to recommend having your exhaust and lambda > sensor checked. I would also advise that my car passed two MOT tests whilst > exhibiting this problem, so your leak (if you have one) may not necessarily > be observable on the ramps. > > Adrian > 1992 9000CS 2.3-16i > > >Thank you Adrian, I will check it out. I replaced the front Oxgyen sensor (post 94 CSEs have one before and one after the catalytic converter) about 3 weeks ago. That cured the "check engine light" but had no effect on the 2200 rpm discontinuity. Best regards, Ramsey

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