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Old 07-31-2010, 12:50 AM   #11 (permalink)
saand
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Join Date: Jul 2010
Location: Melbourne, Australia
Posts: 236

bugler - '91 Mazda 626
90 day: 35.89 mpg (US)
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C3H8, great post.
I have seen in other threads people doing the same thing, i think this mod should be put into the 65+ mods. If you end up doing some before and after efficiency tests please post them, might be able to get the mod into the list

For readers that dont have a nice new modern car like myself i have found that the idle speed control at warm up is achieved mechanically on my 91 mazda 626. Air is bypassed by the throttle control with an idle air control valve (IAC) which has a bimetal device which expands when it gets warm so closes off air bypass at temperature. I shall be trying to defeat the high idle at cold by putting something to block air flow through the air bypass which will then make the car rely on the electronicaly controlled air bypass which will hopefully stop the car from stalling in the cold.

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