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Originally Posted by EDXR8
Don't know why people say it is a crappy system, if the EEC is tuned properly they work extremely well. The problems with I6 idle normally occurs after cam changes mainly because the load calculations are thrown out causing timing and fueling issue. This causes idle surging and the way the ISC works can worsen the surging. You can make up a plate which fits between the ISC and TB with smaller holes and this helps the surging problems out a great deal. The idle control programming can also be altered with a chip like chiptorque etc. Making up a seperate idle controller would be way too hard IMO and would take a lot of development work.
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You make valid points - I've tried the plate mod and found that when the idle decides to behave itself the plate makes it behave very well compared to some raggedness without it.
You've hit the nail on the head about the problem being caused by aftermarket mods - and of course the OEM ECU really can't be expected to be made to cope with that sort of thing - so I'm thinking that a separate ISC control module might be the answer as it can be made either more OR - as I suspect might be the needed thing - LESS sensitive than the ECU idle control circuitry is made to be (I think the plate mod mechanically "de-sensitises" the ISC system so that's how it works to improve things).
Having said that, I wonder if there's just a resistor (or some other electronic component - I'm not an electronics person) that could be put in the ISC control circuit to tone down it's response to the ECU - thereby reducing the "tail-chasing" syndrome that the engine seems to get into at idle?? (again, electronically doing what the plate does but in a different and possibly better way).
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