Date: Thu, 4 Mar 1999 10:43:17 -0000
From: "erogers" <>
Subject: Re: Fuel control computer

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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