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Engine Stall Advice 900 1991

posted by  david hunter on  Sun Dec 30 10:49 CST 2001
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last visit: Mon Jun 30 22:10 CST 2014
[RELATED]

It would be important to know if you are loosing fuel or spark. If you lose spark (read pulses at negative terminal of coil) the tach will go to zero immediately even though the engine rpm may still be winding down. This is because the tach signal comes from the same point on the coil. For the same reason you should see a slight nudging of the tach while cranking. If tach signal is there then you almost certainly have spark unless the coil is bad but they usually do not go intermittent. Power stage, ignition amp and I think ignition module differnet words for same thing. This is what sends above mentioned pulses to the coil. If no spark then prime suspects would be power stage and RPM sensor.
If spark OK then its fuel. Start by resoldering the fuel injection relay. That is your prime suspect. There are instructions in the FAQ section on how to jumper out the relay to apply power directly to the pumps.
Thats my .02 cents worth.

Good Luck





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