Date: Sat, 30 Apr 2005 18:36:14 GMT
From: Johannes <>
Subject: Re: saab 9000cse poor running

Dexter J wrote: > > Salutations: > > On Sat, 30 Apr 2005 05:55:14 GMT, michael spencer via > <> wrote: > > > i have a 93 saab 9000cse 2.0 16v the check engine light comes on it loses > > power wont idle properly and has to be driven hard to make go.It has had > > a > > new cat, lambda sensor been to the main dealer and still i have no joy > > ,the > > car is normally lovely to drive could anybody give some advice,i dont > > want > > to get rid but i am at the end of my tether please help > > Sounds like you're are triggering an intermittent Limp Mode (assuming > Trionic on your part) - and lord can that turn out to be obscure. > > In my case, the car (1993 Aero) was triggering a whole series of different > Check Engine Lights - all of which went away for days, weeks or months if > you disconnected the battery for an appropriate length time according to > the CEL - but which were never permanently repaired by replacing the > suggested failure part. > > As it turned out - it was a very slightly bent loom connector to the > firewall Safety Valve beside the MAP sensor - a sensor that was replaced a > couple of times. In my case that meant that every time a Tech would check > the resistance on the Safety Valve (it should be very close to 30 ohms) > and put the connector back together - it would run fine for about a week - > then fail again for no apparent reason. > > Given you have been to the dealer and assuming they have properly checked > the safety valve and vacuum lines for correct parameters instead of just > plugging in the scanner - I would start looking over the loom for suspect > connections that feed the engine management computer(s). > > It may well be that there is a problem with your Throttle Body or TCS > system - but I now think that should really be the last stop in a rather > longest trip through the wiring loom given my (and the previous owners) > experience. The can be many other reasons for poor running. I've had a few of those for my 9000 of same age, but not recently (or I would probably have written about it here). It would help if he can give more specific symptoms. The problems are often trivial and when you find the cause you shout: "Oh why didn't I think of that".

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