hard start issue

[Henry A Harper III]

Cold starts are actually "easier" for an engine control system, as anyone
who grew up in the good ol' carburetor days (or restarted an airplane with
mechanical fuel injection after a refueling stop) will remember: dump in
fuel and crank until it starts. For hot starts the amount of fuel has to be
just right (or "rats, now it's flooded" with a carb), and the control system
doesn't have a way to sense whether the check valve has failed. So if the
check valve has failed then there won't be enough fuel going to the
injectors right when the engine starts cranking because the pump has to
build up pressure again, and by the time the pressure reaches the injectors
the ECU has dialed back the duty cycle because it doesn't want to flood the
cylinders with too much fuel.

> -----Original Message-----
> From: 200q20v-bounces at audifans.com
> [mailto:200q20v-bounces at audifans.com]On Behalf Of PeterBergin at aol.com
> Sent: Saturday, November 20, 2010 9:51 AM
> To: centaurus3200 at yahoo.com; auditony at gmail.com
> Cc: 200q20v at audifans.com
> Subject: Re: hard start issue
>
>
> 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
>
>
> In a message dated 11/20/2010 10:45:13 A.M. Central Standard Time,
> centaurus3200 at yahoo.com writes:
>
> Thanks  Tony,
>
> i'm still learning here, but isn't the point of the check valve  to keep
> fuel in
> the lines for cold starts? if it's fails, then the fuel  pump has to pump
> the
> fuel back up from the tank, hence the long  starts.
>
> yes, it's cold starts - the car starts right up once  warm.
>
> Robby
>
>
>