Re: Nasty Idle Question

["Mike Blain" <rept@qwest.net>]

are you running forged aluminum pistons

Colin wrote:

>Hi,
>     I'm quite new to this list, but I searched the archive using every
>combination of words that seemed to fit and had no good hits. 
>First the car:
>
>87 8v just over 200k
>head completely rebuilt, polished and decked
>stock cam
>4 into 1 header (Pacesetter)
>2" piping all the way back, through a high-flow cat and Dynomax muffler
>K&N Filter
>expanded inlet (no swiss cheese, though)
>stock throttlebody
>less than 5k on the valve timing belt
>air conditioner
>timing about 8 degrees BTDC
>
>The problem:
>
>     When it first starts on a relatively warm day, it idles like a 20 year old
>Ford.  After it warms up for a few minutes, it smooths out and is good.  On
>cooler days (like we've been seeing up here recently) it starts not bad, but
>the idle goes lousy again after a couple minutes until the engine gets up
>towards normal operating temperature.  Yes I put the O2 sensor in, and it's
>fairly new.  Can't find any intermittent vacuum leaks and the header and
>manifold are snug with good gaskets.
>
>     My question is...is the lousy idle when cold something I have to live
>with, or can I smooth it out, even a little?  I expected it to roughen out a
>bit with the head and exhaust, but it's really severe.  The idle bobs between
>less than 100 and about 500 (it could be worse, I've got the warm, smooth idle
>at 1100).  I think it should be something I can resolve, but I'm out of ideas
>on what to poke at next.  Maybe the fuel pump?  I replaced the filter about 2
>months ago and that didn't help.
>
>     There's more about the car (you don't want to know how much I hate
>balljoints...) including suspension and such, but that doesn't really apply to
>the question at hand.  Thanks for any responses.
>
>Cheers,
>Colin
>
>
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>
>



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