Quote:
Originally Posted by arvidj
Be sure to explain why the idle will be at 750 RPM, then slowly drop to 500 RPM, then quickly accelerate to slightly less than 1000 RPM and then slowly drop back to 750 RPM. This 10 - 15 second cycle will repeat over and over until you shut the car off.
A 500 RPM variance is one hell of an accessory kicking on and off, and it does not do it abruptly like an air conditioner compressor clutch but rather "oozes" from each RPM to the next.
Note that when the air conditioning compressor clutch engages and disengages there is a noticeable click, a minor change in RPM and it happens no matter what position the gear selector is in, and will happen even if the air conditioner is turned off if the heater controls are in any of the windshield defogging positions. I became familiar with this phenomenon in my first air conditioned car ... a new 1973 Pontiac Grand Prix.
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You guys in usa/canada have had quite a few ECU calid updates to supposedly fix the idle issue for auto/manuals, we got a couple of updates in Oz as well not as many as you guys though, does not appear to be as much of an issue in Oz
ZA1J700D original
900D idle / VVT cam fix
A00D idle / VVT cam fix 2
A01D transient retard DI seal fix
B00D idle fix
B01D more idle fix for A/C 2 last rom id for My 2014 and earlier cars
D00D latest calid for auto my2015
looks like they still have not got it sorted completely yet
most tuners bump up idle from factory standard 650 to 750 rpm which help a lot.
fair few people on this forum are tuned so the issue is diminished for them
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