Sometimes I cant shut my engine of. The fan keeps running and the engine. but wont shut off. I have to put it in gear. !!
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Sounds like a bad ignition switch?
I seem to remember reading that there is a condition where the electric fans spinning act like generators, providing voltage to the ignition system even after the key is turned off. Does the car turn off ok when the fans are not running? Next time it happens, try pulling the fan fuse and see if that kills the car.
quote:Originally posted by Dave2811:
I seem to remember reading that there is a condition where the electric fans spinning act like generators, providing voltage to the ignition system even after the key is turned off. Does the car turn off ok when the fans are not running? Next time it happens, try pulling the fan fuse and see if that kills the car.
Actually, if that is the problem you can just step on the brake pedal; the brake lights take enough power to kill it.
your fan is backfeeding the ignition switch.
Basiclly any turning motor is a generator when it is powered off.
You need to be able to stop the current going to the ignition switch by either installing a fan kill switch or the easy way is to put a diode in the circuit stopping the current from backfeeding the ignition. Ask around for others to respond and they may have better ideas on how to do it. if you do a search you may be able to find better information I believe it is in the forum.
Basiclly any turning motor is a generator when it is powered off.
You need to be able to stop the current going to the ignition switch by either installing a fan kill switch or the easy way is to put a diode in the circuit stopping the current from backfeeding the ignition. Ask around for others to respond and they may have better ideas on how to do it. if you do a search you may be able to find better information I believe it is in the forum.
I had that happen to me once when I had the fan 'quick wired' to test things out, shut the key off & she kept right on running but not quite right
the fan motor generator wasn't able to sustain voltage so the fan itself & the engine both slowly dropped rpm until coil volts dropped off to where it wouldn't run any more. pretty sure there was a good reason why I wanted to shut it off right away at that point too
the fan circuit needs to be isolated from the ignition switch. I have mine wired through a relay, the ignition switch only enables the relay trigger side Positive, and the fan temp sensor switches Ground/Earth
the fan motor generator wasn't able to sustain voltage so the fan itself & the engine both slowly dropped rpm until coil volts dropped off to where it wouldn't run any more. pretty sure there was a good reason why I wanted to shut it off right away at that point too
the fan circuit needs to be isolated from the ignition switch. I have mine wired through a relay, the ignition switch only enables the relay trigger side Positive, and the fan temp sensor switches Ground/Earth