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Old 01-23-2003, 18:12   #1 (permalink)
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ED idle

On my ED 4.0ltr there is a sticker under the bonnet that says idle should be at about 600 or so rpm.(its an auto) Problem is that the tacho reads it at idle to be about 300-400 rpm. And yes i have read it correctly, checked numerous times:). The car doesn't idle rough or want to stall, infact it seems to be running perfectly normal. I only noticed this since i put an s-pac dash in about 2 months ago, but its not running any different from b4 the dash went in. So is the tacho reading slightly wrong or do i need to up the idle? And how do you up the idle? Thanks in advance

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Old 01-23-2003, 19:16   #2 (permalink)
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Like speedos, Tachos arnt always known for their accuaracy, hook a multimeter to it that can measure RPMs and see what its idling at.
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Old 01-23-2003, 19:40   #3 (permalink)
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Yea, like Martin said, those speedo's aint that accurate, especially at low rpm coz the grading is slightly compacted on the dial. Tho a I6 will idle slightly better then a 4cyl at lower revs. My EB 3.9L revs around 450rpm (in drive) and it seems completely happy with it so i aint gonna touch it...

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Old 01-23-2003, 20:54   #4 (permalink)
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If it's o/k then leave it that way. Upping the idle will also increase your throttle position on your senser, making it idle slightly rich and could cause surging troubles..
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Old 01-23-2003, 21:12   #5 (permalink)
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Thanks for the replies guys.
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