hard start issue

[Phil Rose]

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)