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] > To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/dmcnews/join (Yahoo! ID required) <*> To change settings via email: mailto:dmcnews-digest@xxxxxxxxxxxxxxx mailto:dmcnews-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/