Date: Tue, 9 Mar 1999 10:26:19 -0500 From: "Eric Law" <elawnopsamexxx.com> Subject: Re: Fuel control computer
Ed, I've got an '86 9000 turbo and it experienced a similar problem (although very intermittent in my case). It was the air-mass meter, although it passed the "glowing wire" test just fine. Off the top of my head, I don't think your two AMM's are the same. '86 turbo has LH2.2 injection, '87 non-turbo has LH2.4. But to be sure, look on top of both for the Bosch part number. If the number's the same, they're OK to swap. Couple other hints: Neither the air-mass meter nor the O2 sensor can be properly checked by measuring resistance, and in fact it's pretty easy to damage them this way! The AMM is almost impossible to test, substitution is by far the easiest method. For the O2 sensor, the heater part can be checked by measuring the resistance on the 2-pole connector (s/b low, like 5-10 ohms). However, to check the actual sensing part, you need to connect a digital (NOT analog) meter between the 1-pole connector (while leaving it connected), and ground. Within 30 seconds (at most) of starting the car, the voltage should begin to cycle between about 0.3 and about 0.8, cycling about once a second, and fairly evenly. For a really good test, make your connections so the meter can be inside the car, and go for a ride (have someone else drive!). While the cycling may momentarily get uneven, it should never stop completely. If it stops in a low-voltage condition, the motor is not getting enough fuel. If it stops "high", it's getting too much. Hope this helps! Eric Law erogers wrote in message <7c3bmg$dod$1nopsamrius.ultra.net>... >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
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