hard start issue

[Philip Rose]

It's the COOLANT temp sensor. Look at rear of engine on passenger side.

Phil


On Nov 20, 2010, at 5:36 PM, robert weinberg <centaurus3200 at yahoo.com> wrote:

> i'm not finding anything for an engine temp sensor - do you mean coolant temp sensor? or the intake temp sensor?
> 
> Regards,
> Robby
> 
> 
> From: Phil Rose <pjrose at frontiernet.net>
> To: PeterBergin at aol.com
> Cc: centaurus3200 at yahoo.com; auditony at gmail.com; 200q20v at audifans.com
> Sent: Sat, November 20, 2010 8:26:38 AM
> Subject: Re: hard start issue
> 
> At 11:51 AM -0500 11/20/10, PeterBergin at aol.com wrote:
> > Curious, when mine went, the car would cold start but would crank a long time when trying to restart after it sat for an hour.
> > Pete
> > 
> 
> Same experience here. So, if Rob's symptom is that his car starts fine after it's warmed up (i.e., after running it then restarting after a wait at *least* 20 minutes to an hour) yet it has a problem starting when dead cold, then I seriously doubt that it's a check valve issue.
> 
> Why? Well, when the engine is "cold" (after standing overnight or beyond an hour after shutdown) the engine temp sensor modifies the start-up to make an easier "cold start", and that tends to compensate for the fuel line "leak down" issue. But when the engine has warmed up, that special cold-start sequence is not used, so any fuel-line leakage will tend to cause excessive cranking if there's been enough time for leak-down (20-60 minutes). That's the "classic" symptom for a bad fuel line check valve.
> 
> Rob, perhaps have a problem with that engine temp sensor. I forget the Bentley number (G60?), but think it's a sensor located at the rear of the engine (passenger side)--not the MFTS. The same number is used for more than one sensor I seem to recall.
> 
> Phil
> 
> -- 
> Phil Rose.....Rochester, NY USA
> '06 A3q 3.2 V6 (20K, silver)
> '91 200q    (165K, Lago blue)
> Gone to Audi Valhalla:
> '91 200q  (Tornado red)
> '89 100 (Bamboo gold)
>