[DML] Re: Warm Start Issue -- Looking Elsewhere Than Fuel System (David
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[DML] Re: Warm Start Issue -- Looking Elsewhere Than Fuel System (David McKeen)



Thank you so much.
Finally someone who reads what is posted and uses his knowledge to 
help.

I wonder how many people really have this problem and just accept it 
normal to swap the plugs to get it started.


--- In dmcnews@xxxxxxxxxxxxxxx, Peter Lucas <lucas@...> wrote:
>
> 
> On Feb 10, 2008, at 9:30 AM, Harold McElraft wrote:
> 
> > I think it is a pressure problem. Your symptom description seems 
to
> > confirm it.
> 
> I don't mean to be snippy, but you guys just aren't listening.  If 
you  
> search the archives, you will see that there have been many 
reports  
> over the years of a "warm start" problem.  This is different from 
the  
> classic "hot start" problem, which is indeed usually caused by a 
bad  
> accumulator.
> 
> Hot Start Problem:
> This happens when the engine is hot. Like when you stop at the gas  
> station, fill the tank, and then are embarrassed because you can't 
get  
> the car restarted.   As Farrar's quotes from the service manual 
make  
> clear, this is caused by a very hot engine causing fuel to vaporize 
in  
> the system:
> 
> > "The accumulator maintains pressure in the fuel system to prevent 
fuel
> > vaporization while the vehicle is not in use." --Tech manual, 
pages
> > 46-47."
> 
> Whether you want to call this "vapor lock" or not doesn't matter, 
it  
> is heat-induced vaporization that causes "hot start" problems.
> 
> 
> Warm Start Problem:
> This occurs after the car has been sitting for several hours. This 
is  
> far longer than the specified minimum hold time for rest pressure--
by  
> this point, the engine is assumed to be cool enough not to cause 
the  
> kind of vaporization that the accumulator is intended to prevent.   
> However, it is still warm enough that the cold-start valve is  
> inoperative. Something causes this problem, and it can't be the  
> accumulator (because according to spec, there isn't expected to be  
> rest pressure after several hours).
> 
> Many of us have been plagued by this problem, and I do not believe  
> that a definitive explanation has ever been forthcoming. (I am the  
> author of the article in the Tech Section on installing a full 
time  
> pressure sender -- 
http://www.dmcnews.com/Techsection/fuelpressend.htm  
> -- so I know how my fuel system behaves).  It is true that 
swapping  
> the plugs will solve both a Hot Start and a Warm Start problem, 
but  
> this does not make them the same thing.
> 
> Given that there have been several reports of the Warm Start 
Problem  
> beginning after a water pump swap or other major engine procedure, 
my  
> guess is that it is due to an accumulation of small problems, such 
as  
> vacuum leaks, improperly gapped spark plugs, etc.   But that is 
just  
> speculation--sure would be nice to nail a definitive 
explanation.     
> But blindly blaming the accumulator won't get us there.
> 
> 
> --Pete Lucas
>    VIN #06703
> 
> 
> 
> 
> [Non-text portions of this message have been removed]
>




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