hard start issue

[robert weinberg]

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)