Re: Idle

[Dan Bubb <jdbubb@ix.netcom.com>]

I believe the variation you are talking about is when the engine is
trying to transition to closed loop control. I'm not sure how it
decides, but it seems like after a set time it tries closed loop and if
the idle drops too low it goes back to open loop, then tries again a
little later.
Just letting the engine idle through this warmup stage will cause it to
have these symptoms more than if the car is driven. Then the engine and
O2 sensor warm up quicker and can go into closed loop quicker.
Quick test might be to disconnect the O2 sensor and see if this stumble
or erratic idle goes away.
Dan

Kervin Ridgley wrote:
> 
> My 86 8v starts great hot, warm or cold.  It fires right up.  When it is
> warm, it idles at about 1000 rpm.  About one minute after a cold start,
> it hunts for the idles varying between 350 and 1100.  After it warms up,
> about 3 more minutes, the idle is a steady 1000.  Any ideas what I can
> do to make it smooth all the time.  I wanted to fix it before I put on
> my 4-2 manifold, downpipe, cat-back system and g-grind.  I'm a little
> afraid that I'll have too many variables to track down if I wait until
> after the changes.
> --
> Kervin
> 80 1.7 8v Crack free dash
> 82 1.7 8v The gift
> 86 1.8 8v My everyday ride
> 00 tt600 more HP than my car
> 00 Habanero my cheap ti ride
> 00 IF Delux XT-Bomber
> 
> --
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