Don't know if anyone is able to help but my mother in law has an import 93 mx5 that's giving me a headache.
Basically it is very reluctant to start but when it does fire (after the 6 or 7 attempt) it runs relatively well. However if the air con is turned on, every now and then the revs will become erratic, dropping and rising on there own. From what I can tell, the rough idling starts with the click of a relay (passenger side). This brings the air con fan on and I think the compressor,I would understand a small change in revs but this is +/- 500rpm. Then it settles for a bit but then, presumably, the relay drops out and the fan and comp go off, revs fluctuate, finally settling. This continuously repeats.
Other things worth noting are that the rev counter works at nothing other than idle (anything engine speed other than 800ish rpm and the tacho drops to zero). Also the coolant fan is permanently on with the ignition but off again when engine is running.
Does anyone have any ideas or experienced anything like this before? Let me know if you require anymore info
Thanks, Craig
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