Ignition Problem - no spark - Saab 900 Bulletin Board - Saabnet.com
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Ignition Problem - no spark
Posted by Mike Hopman [Email] (more from Mike Hopman) on Sun, 28 Mar 2004 14:44:00
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Thanks for taking your time to help me with this. My car is a 1991 900S (non turbo), 219,000 miles.
Symptoms: No spark.
Tests conducted:
1. Checked plug wire and rotor resistances. These were a good. Rotor and cap looked worn, so replaced. Primary high tension lead was 1500 ohms. Spark plug leads were within spec. They looked good, clean, no obvious problems.
2. Knock sensor tested. Got a response so OK.
3. Checked for power to the EZK Control Unit. Battery Voltage between pins 6 and 20. (With connector unplugged and ignition on) Read ~ 12 volts
4. Checked for power to the amplifier. Battery Voltage between pins 4 and 2 on fender mounted amplifier. (With connecter connected and ignition on.) Read ~ about 0.2 volts
5. Checked for power to the coil. Battery Voltage between terminals 15 and ground with ignition on. Read ~0.2 volts.
6. Checked the coil primary and secondary circuit resistance. (with ingition off and all wires removed from the coil) I got 0.9 ohms between terminals 1 and 15 (within limits) and 7,500 between terminal 1 and center tower.
The instructions say that if no voltage at the power amplifier, look for faults back to the ignition switch. How do I do this?
At this point I am lost. Any help for ideas would be appreciated.
Thanks,
Mike Hopman
posted by 209.173.230...
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