Hard start, cold start problem, rough idle
dbpulvino at hotmail.com
Thu Jun 29 16:46:47 EDT 2006
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.
>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.
>On 6/29/06, Derek Pulvino <dbpulvino at hotmail.com> wrote:
>>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
>>the car, lot of stumbling for a couple of minutes and the check engine
>>will come on, but I get no fault codes.
>>Right now, my key suspect is the idle stabilizer valve, and I do recall
>>when I last pulled it to check, the flapper/valve seemed to
>>going to do an "output test" when I get some spare moments again. The
>>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
>>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.
>>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
>> <9be3f0980606281405v257c1184q199efc0a6c4b9464 at mail.gmail.com>
>>Content-Type: text/plain; charset=ISO-8859-1; format=flowed
>>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
>>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
>>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,
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