[DML] Re: Hesitation from the Line

["DMC Joe" <DMCJOE@xxxx>]

Marc,
The cold start valve's only function is to fire during the cranking process
to aid in the starting of a cold engine. The modification you mentioned
could result in premature combustion inside the turbo.

DMC Joe / DeLorean Services / <dmcjoe@xxxx>
Web Site: <http://www.deloreanservices.com>

----------
> From: Marc A Levy <malevy@xxxx>
> 
> I sometimes have this problem too when the engine is cold. Was it cold
> when this happened?
> 
> I suspect the problem is that with the turbos (I have twin turbos, so I
> am assuming your setup is similar to mine) the cold start valve does not
> work properly due to the lack of vacuum in the intake where the valve
> (injector?) is located. My non-professional opinion would be that
> because this extra shot of fuel is not being sucked in to the intake as
> it normally should (because of the boost), the car hesitates.
> 
> I have considered relocating the tube that the valve is in to a point in
> the system before the turbos. On my car there is some space between the
> throttle plate and turbo inlet (This is where the vacuum for the timing
> control is taken from). This should be the point of highest vacuum in
> the system under all driving circumstances (boost or not). I have some
> reservations about trying this, and it may be a good time to present
> questions to the list to see if there are any answers-
> 
> - Is it OK to run a air/fuel mixture through the turbo? Currently no
> fuel goes through the turbo and I worry that the fuel may damage the
> turbo, and may even be a fire hazard.
> 
> - The cold start valve assembly also includes two barbs for vacuum for
> the PCV system, and fuel vapor recovery system. Will the contaminants
> from those sources damage the turbo or be a fire hazard?
> 
> - I had some others, but forget now :)