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97 sc400 high idle when cold issues??

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Old 04-16-11, 11:11 PM
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xspsi6
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Default 97 sc400 high idle when cold issues??

Ok so I have no vac leaks and my idle valve is working properly as well as intake is very clean so maybe I am over looking something here but when it warms up it seems to be fine but in the morning if I put it in gear it is almost like a "neutral drop" so I have searched alldata as well and no avl

No cel's or bending dtc'c either


Suggestions?
Old 04-16-11, 11:31 PM
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iwannadie
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It may be helpful to list just how high the idle is.
Old 04-16-11, 11:43 PM
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SC_coupe
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ISCV can still act up even if it looks clean and gives proper resistance -- mines doing it right now even though it seemed okay. Are you 100% sure its working as specified?

http://planetsoarer.com/IAC/iac.htm
Old 04-17-11, 05:45 PM
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xspsi6
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Well I took it apart and cleaned it real good and so far it has been much better so I will update tomorrow after a cold start as that will be the real test.


Thanks guys for the help!!
Old 04-17-11, 05:53 PM
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1WILLY1
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youyr car will alwways idle high when cold--they all do it


no need to worry unless its very high


what rpm's are u getting when cold?
Old 04-17-11, 06:22 PM
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xspsi6
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1,800 when cold which is way to high but now it is holding 1,200 on cool starts.

It was so bad that I would sit and wait 10 mins before putting it in gear due to the fact that it was just a matter of time before it ripped my brand new trans mount out.
Old 04-17-11, 06:29 PM
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LiCelsior
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and whats the RPMs when its warm in park?
Old 04-17-11, 06:31 PM
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1800 is way too high----mine gets about 1200 on a cold start but im in canada
in florida you shopuldnt be getting those numbers
Old 04-17-11, 06:36 PM
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xspsi6
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Before the second cleaning it was about 1200 in gear which of course is way to high now it seems to be 600-700ish in gear which is a 100% improvement from before but what stumps me is the fact that I cleaned it a month ago and there was no improvement but this time I took it all the away apart and that seemed to do the trick.
Old 03-20-12, 07:11 AM
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718murdoc
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Hi everyone,
I hope someone can help me with an issue I have with my 92 SC400. I've had a misfire for a couple weeks now which I was told can be solved by doing a tune up. My car would normally start at 11-1200 RPM from a cold-start, but today I started it from cold and it was at 500 RPM and there is no change from 500 RPM. The car now will not maintain normal speed even when I floor it. There is no CEL on. Is this a cold start issue? I'll get the tune up to begin with and hopefully this cures the misfire and the unusual RPM I have. If anyone has any info about this issue I would really appreciate it.
Old 03-20-12, 12:54 PM
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cartmill
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how high does it "idle" when it's cold?
Old 03-20-12, 02:13 PM
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718murdoc
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It idles at 500 rpms when cold, it would normally idle at 1000-1200 when cold and thats what worries me atm
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