Hard start, cold start problem, rough idle

[Ben Swann]

I had this happen once after doing a timing belt job on a car.  I had changed
the turbo to a clipped wheel k24, but don't see this as being a problem since
does not come into play at idle/off-idle operation.

 

Don't know what it was - possibly bad/mis-adjusted TPS. Somewhere in the
courts of thing the TPS got changed and adjusted properly, but I think the
proble had gone away by then.  It was a car I had worked on for someone. The
car seemed to clear its throat after a few days and the problem went away
mysteriously.

 

I'd like to know what you find.

 

I'd be on the lookout for any vacuum leaks, also weather or not the
idle-switch portion of the TPS is working properly.

 

Ben

 

[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]