Re: Death on Friday the 13th - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Death on Friday the 13th
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Posted by Makis (more from Makis) on Sat, 14 Sep 2002 16:25:24 Share Post by Email
In Reply to: Re: Death on Friday the 13th, MikeG, Sat, 14 Sep 2002 13:51:22
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1. Testing coolant sensor. Is tricky. A way to do it is to identify the ECU, disconnect the connector, identify the pin corresponding to the coolant sensor (see haynes manual) and a suitable ground and measure the resistance with an ohm meter. A resistance of over 2K with a cold engine will be OK. If the resistance shows something like 100ohms with a cold engine then the starting mixture will be lean and the engine will be very difficult to start even if you have spark. Low resistance (100 ohms) with engine cold will mean the sensor will need replacement.
2. Testing fuel pressure, you will need a fuel pressure meter that you need to insert in the fuel delivery lines. This is specialist tool and it may be easier to let a garage do the job for you. If you can get the car started, low fuel system pressure will also give you drivability problems, usually low power.
3. Air flow meter testing. I don't know how this can be done. I think the Saab has got an air mass sensor and the meter should be tested while the engine is running. I guess the ECU may be able to test it and give you a fault code if something is wrong with it?
4. O2 sensor does not affect the starting. If you can start the engine, leave the engine running until it gets hot. Then you can disconnect the O2 sensor and mesure the voltage it generates (make sure you use the correct pins to take measurements). It should generate a voltage between 0.1-0.9V and constantly changing. If there is no change then the O2 is faulty.

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