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It may be worth you changing the ATF
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Already 8L deep on a full change (gradually in parts).
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The heater that cleans the wire failed on the old one.
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Good to know mine works then (presumably), certainly no rough running generally speaking.
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The ATF will be thinner and more fluid
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A reasonable and simple explanation, appreciated
Re: your point on the IAC valve, Clifford: Yes autos do still have one. I guess I'll dump some more carb cleaner through mine shortly - mine was still playing up today despite the cooler weather.
If cleaning the IAC valve (again, only a 10 minute job though) doesn't have any effect, and if the park/neutral switch diagnostic test checks out okay, then I'll just accept it as part and parcel and leave it. Will post an update on the above 'fixes' sometime tomorrow evening, I expect. Thanks all so far.
As a quick extra note, being from an electronics background, it 'feels' as though when in park/neutral, the idle speed is 'dropping out of regulation', if that means anything to anyone, hence I'm still leaning towards something engine management related, rather than transmission related. I could very well be wrong though.