Re: IML: '82 coupe rough idle

["jsadowski" <jsadowski@xxxxxxx>]

I have a feeling the problem is in the carb adjustments. I put a new carb on 
my 69 & when it ran the best, it wouldn't pass the idle test. Further 
adjustments made some tests better & others worse. On the 3rd try, all the 
other tests passed by a healthy margin. The idle test barely passed.
John
----- Original Message ----- 
From: "Nat Hall" <nathall@xxxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Sunday, May 28, 2006 9:53 PM
Subject: IML: '82 coupe rough idle


> Hey list,
>
> Some of you may remember I recently had my '82 fail the smog test because
> of CO emissions that were too high during the treadmill test (CO at idle
> was OK). Well, I decided to start simple and I replaced the O^2 sensor
> since the old one was obviously toast.
>
> That had an effect, but I'm not sure what it means.  Now the car seems to
> run better overall while in motion and *seems* to have better power while
> accelerating.  But now the idling has gone to crap. All I did was change
> the sensor, nothing else.  The idle is rougher than it used to be,
> especially when started cold-- it even stalled once on me the other day
> when I was trying to warm it up. Once it's warm, the idle is still rougher
> than it used to be but not so bad it stalls.  Regular driving it runs
> great, like I said, maybe better than before. Absolutely no problems or
> even hints of problems at all. What gives?
>
> I know enough about engines and cars in general that I can easily get by
> working on them as long as I have a FSM, but diagnosing obscure
> carburetor/vaccum/emission related stuff is my weakness. Now that I have a
> known-good O^2 sensor, do I just need to adjust the idle speed on the
> carburetor? I didn't think I should have to do that. Anything I should 
> look
> into before that?
>
> Also, not sure if this is related, but I found I have an exhaust leak
> somewhere on the passenger side in engine compartment. My guess is the
> passenger side manifold, but I can't find out exactly where it's coming
> from. Could this be allowing excess oxygen in during idle and screwing up
> the sensor's signal causing the roughness? If so, then why wouldn't this
> affect the way the car runs while driving? How hard is this going to be to
> track down and fix?
>
>
> -------------------
> Nat Hall
> 1982 Imperial Coupe
> -------------------
>
>
>
>
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