Hi James, the early Z3 vehicles had a common issue with the ignition switch not recognizing when the key has been removed. You can listen for a definitive click when the key is removed from the switch. There is a gong located under the driver's dash area in the plastic trim panel. It can be unplugged.
SOURCE: Ignition Key
Yes, there is a battery in the key fob. You'll have to open it up and replace it. If you are unsure how take it to the dealer or autozone or other type parts store and they can help you and sell you the battery.
SOURCE: bmw 525i (1990) intermitent ignition prob
Install hotter plugs and run it harder between stops. Also check your fuel pressure regulator.
SOURCE: the hazard lights start flashing and I can't turn
there must be alarm fitted that either has the siren disconnected or turned off. Basically sensing an intrusion alert or voltage drop. Flip out the hazard switch, there will be a wire which runs seperate from the body loom into this light, just cut it, the correct one though. if needs be trace it back.....probably end up behind the glove box
SOURCE: on my bmw2006 330i it
In your car the engine starts this way: a code stored in the remote key is sent wirelessly to the receiver in the receptacle (thru its coil antenna) which sends it to the ECM to activate it; then the starter button sends the command for the actual starting.
In your case the receiver appears to keep the code in memory when it shouldn't. Have it replaced. BTW this has absolutely nothing to do with the ignition coil.
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