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Date: Thu, 4 Mar 1999 10:56:12 -0000
From: "erogers" <>
Subject: Re: Fuel control computer

I need to make a correction here . He measured the resistance on the air mass meter but the O2 sensor has been replaced. Ed erogers wrote in message <7bm9n1$njq$>... >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 >Justin VanAbrahams wrote in message <>... >>erogers wrote: >>> >>> Hello . Jerry , the fellow who posted this letter , is my dad and I have >>> test driven the car so I think I can respond to the reply . I do not >believe >>> that it is a vibration problem . He already look at that . It does feel >like >>> a fuel control problem . I found that when it was running bad that their >>> seems to be a dead stop when you try to accelerate . I believe that the >>> engine light flashing indicates a fuel fault . Any know if that is True ? >He >>> already look at the O2 intake sensor . He believes that it is working >fine , >>> Their is a new fuel filter on it ( he did the easy stuff first ) . It >seems >>> that the only thing left is that computer that controls the fuel system . >>> Does any out ever had to change one ? Thanks for your time. >>> Ed. >> >> >>I did not catch the beginning of this thread... what year is the car >>in question? If it's before 1989, the Check Engine light only turns >>on when there is a "massive" failure in the mixture - either a result >>of a failed O2 sensor, disconnected air mass meter, etc. This condition >>will result in poor performance... *really* poor performance. >> >>On '89 and later cars, using LH 2.4, the Check Engine light will come >>on during simple mixture problems, or other faults. These faults >>will be stored in the ECU and can be retrieved. In these cars, a >>check engine light can result in really poor performance or simple, >>occassional drivability problems. >> >>Most likely, the problem will be the air mass meter or the O2 sensor. >>A little more info and I might be able to help. >> >>-Justin > >

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