Hard start, cold start problem, rough idle

Fri Jun 30 13:54:24 EDT 2006

Little more information I've gleaned on this issue...as soon as the car 
warms up to say the temp needle being at about the first small hash mark, if 
I turn the car off, upon restarting even just second later, the car will not 
idle of it's own accord.

Also had the stumbling problem just start happening as I was waiting to get 
on the freeway this AM.  Stumbling was accompanied by the Check Engine light 
and then went away within about 2-miles/5-minutes.  I hope it threw a code, 
but my past experience says it probably didn't.

Anybody with additional ideas as this is getting ridiculous.  What could 
possibly change by turning the car on and off?

Derek P

>Derek, Bryan, and others with this problem.
>
>Obliviously there could be multiple causes for these symptoms, but 
>replacing
>the O2 sensor solved the problem on my 90Q-20V.
>
>Good luck, and Derek, how did the heater core go? Takes lots of beer and
>vocabulary for that one.
>
>Bernie
>
> > From: "Derek Pulvino" <dbpulvino at hotmail.com>
> > Date: Thu, 29 Jun 2006 13:46:47 -0700
> > To: brfoster at gmail.com
> > Cc: 200q20v at audifans.com
> > Subject: Re: Hard start, cold start problem, rough idle
> >
> > Bryan,
> >
> > It's a possiblity, but only way to know is to pull out the injectors and
> > check things out.  I also know on my car that on start up, I do get
> > excessive smoke and that could be from bad valve stem seals, but the 
>smoke
> > (when I back through it) always has more of a burnt gas than oil
> > smell....further reinforcing the "too much gas" theory.
> >
> > On my car, the rough running doesn't last for 10-minutes...the inability 
>of
> > the car to idle w/out my foot on the gas when warm does.  Usually rough
> > running goes away after a minute or so...although yesterday it carried 
>on
> > for a couple of minutes.
> >
> > Derek P
> >
> >> Thanks Derek,
> >> What do you think of a single isolated leaky injector?  If the car was
> >> sitting for at least 30min it could accumulate enough leaked fuel into 
>the
> >> cylinder causing an overly rich mixture on startup - giving a rough 
>idle at
> >> startup only.  I dont know why that would last up to 10min in your car
> >> however.  It seems to fit my problem of 30-45 sec more.
> >>
> >> Bryan
> >>
> >>
> >> On 6/29/06, Derek Pulvino <dbpulvino at hotmail.com> wrote:
> >>>
> >>> Bryan,
> >>>
> >>> I've been having the same problem for a while, and notice it also does 
>go
> >>> away in the colder months...in fact now that's it's warmer again, when 
>I
> >>> restart my car when it's warm, and last ran within an hour to two, the 
>car
> >>> won't idle at all without me keeping my foot on the gas...that 
>condition
> >>> lasts for at least 10-minutes.  Also notice the rough running when I
> >>> restart
> >>> the car, lot of stumbling for a couple of minutes and the check engine
> >>> light
> >>> will come on, but I get no fault codes.
> >>>
> >>> Right now, my key suspect is the idle stabilizer valve, and I do 
>recall
> >>> that
> >>> when I last pulled it to check, the flapper/valve seemed to
> >>> immovable.  Was
> >>> going to do an "output test" when I get some spare moments again.  The
> >>> only
> >>> thing I can think is maybe this is sticking, and causing the car to be
> >>> overly rich on warm startup...but it doesn't answer the question as 
>the
> >>> why
> >>> the car wouldn't also do the same once it's warmed up.
> >>>
> >>> Some other ideas I had was maybe the temp. sensor to the ECU was 
>crapped
> >>> out, but resistance at the sensor was within spec when I checked, or 
>maybe
> >>> I've got a back check valve which is letting the fuel pressure decline 
>too
> >>> much between starting...but then I wouldn't have idle problems for as 
>long
> >>> as I do.
> >>>
> >>> All in all, this is quite frustrating and not contributing to a health
> >>> demeanor when I'm on the road.
> >>>
> >>> Derek P
> >>>
> >>> Message: 1
> >>> Date: Wed, 28 Jun 2006 17:05:45 -0400
> >>> From: "Bryan Foster" <brfoster at gmail.com>
> >>> Subject: Hard start, cold start problem, rough idle
> >>> To: 200q20v at audifans.com
> >>> Message-ID:
> >>> <9be3f0980606281405v257c1184q199efc0a6c4b9464 at mail.gmail.com>
> >>> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>>
> >>> Listers,
> >>> I have had a couple of weeks of rough idle during cold start ups.  The 
>car
> >>> will start easily, but then idle very roughly for 30-45sec.  After 
>that
> >>> time
> >>> it runs and idles very smoothly.  If I start it up and immediately rev 
>the
> >>> engine to >2000rpm then it runs very smoothly, but if I was to let off 
>the
> >>> gas and let the engine slow down to idle then it sputters and nearly
> >>> stalls.  When I rev it up right after start up there is a considerable
> >>> delay btw putting my foot down and engine response as if the mixture 
>is
> >>> way
> >>> off.   It seems to happen if the car has been sitting for >1 hour.  
>Not
> >>> necessarily a completely cold block.  Does this point to anything in
> >>> particular.  Leaky injector?
> >>>
> >>> Thanks in advance,
> >>> Bryan Foster
> >>>
> >>>
> >>>
> >
> >
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