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Date: Tue, 9 Mar 1999 09:37:02 -0000
From: "erogers" <erogersnopsamaltelemedix.com>
Subject: Re: Fuel control computer


Hello Justin . We actually tried this test to see if the wires glow and the result was that it did . I think that we are going to have to swap it out to be sure. My brother-in-law has an 86 9000 turbo . Can I use that AMM in the 87 ( no turbo )? Ed. Justin VanAbrahams wrote in message <36E0B73F.6F48nopsam.com>... >erogers wrote: >> >> The car is a 1987 Saab 9000 , 5 speed manual . That is the impression we >> have , that it's a fuel mixture problem . I believe that my dad look at the >> 02 sensor. He measured the resistance on the leads and got what he expected. >> Is their a way to determine ( other than measuring resistance ) whether the >> sensor has gone bad ? If the sensor and contacts are good then I would >> expect that the computer is bad . We are trying to figure out how to >> separate the two possibilities . Any Ideas how we can test this ? >> Ed > > >Okay... on '87 model year cars, LH 2.2 is used. It is basically >a very 'stupid' management system, in that it has no real ability >to detect or diagnose faults. It really can only tell when a >component is seriously malfunctioning, or when it is completely >missing... :) > >In this case, the air mass meter is most likely at fault. Although >there is a test proceedure, I've never found doing so it to provide >reliable results. Your best bet is to find a known good one >and swap it out - doing so is very simple. > >Unfortunately, I'm not aware of any real possibility of separating >the two components to isolate a problem. Since you've already done >the O2 sensor, chances are (and I'd say always were), that >the AMM is failing ... I will say that your stumble coming off idle >sounds *very much* like a failing air mass meter, and if the car >has more than 100k or so on the original unit, it would not >be surprising that it's the source of your problem. > >There are three individual tests for the AMM, and none of them >guarantee that it's working... if you want, I can post or email >them to you... The easiest one is to check the burnoff feature - >disconnect the AMM from the airbox, start the car, rev it >to about 2500rpm, hold it for a few seconds, and turn off the >engine - watch the AMM and in a few seconds you should see >the three wires glow pretty brightly. If they don't, you've >got a hosed AMM. > >-Justin

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