Re: Nasty Idle Question

[Robert piwonka <tpiwonka@TTACS.TTU.EDU>]

Have you replacced the injector o-rings?  it has been my theory that if your
injector o-rings are bad you will have more cold start problems because the
rings are all brittle and don't seal creating a vacum leak when cold, but
after thet get warm they seal and then your idle is better.

something to consider.

Robert Piwonka
----- Original Message -----
From: "Colin" <cwass99@home.com>
To: <scirocco-l@scirocco.org>
Sent: Monday, October 15, 2001 8:22 PM
Subject: Nasty Idle Question


> 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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