Warm Start Symptoms-Please Help

[Edward J Kellock]

I had a similar problem on my '89 200q.  I replaced the fuel
pump check valve.  I did find that the one already on the car
was not tightened properly, so I may not have needed the
new one, but since I was already that far into it I installed it
anyway.

Ed
Colorado Springs

On Sat, 17 Aug 2002 12:29:05 -0400 Phil Rose <pjrose at frontiernet.net>
writes:
> Grant,
> Sounds like a loss of fuel pressure. You've described a common
> symptom-- in fact it's the one now afflicting my wife's car (but I
> haven't fixed it yet.) :-(
>
> My understanding is that slow internal leakage somewhere in the
> fuel
> system allows the fuel-line pressure to eventually drop low enough
> (in hot weather and/or a hot engine) for a vapor bubble to form.
> Most
> often, it's claimed that pressure loss is from a defective check
> valve (located on/in the fuel pump). This check valve is external
> to
> the oem pump (i.e., can be replaced separately), but is built into
> the slimline replacement pumps.
>
> Other causes could be leakage at one or more injectors or in the
> fuel-pressure regulator.
>
> The idle speed "hunting" sounds like another issue. Is the A/C
> turned
> on? Perhaps a balky ISV (idle stabilizer valve)?
>
> Phil
>
>
> At 7:59 AM -0600 8/17/02, Grant Dion wrote:
> >Hello
> >
> >Can anybody tell me if problem is a Hall Sensor or a Fuel pressure
> issue, or
> >another likey suspect?....My 200tq starts right up when it is dead
> cold.
> >When it is dead cold, after it starts right up, it often hunts for
> the
> >correct idle, tach goes from i'd say 800-1200 RPM. Eventually
> hunting stops
> >and car runs fine. If I drive it until the temp is normal, when I
> shut down
> >and start it after only  a few minutes it will start right up, but
> if I let
> >it sit for anywhere from 1-5 hours, (that is an educated guess) it
> is very
> >hard to start. . I crank it for 10-15 second bursts, then usually
> on the 3rd
> >one it starts. When it does start is stumbles for a couple of
> seconds, then
> >runs fine.
> >Any Help is greatly appreciated.
> >
> >Grant Dion in Colorado Springs
> >
> >
> >--__--__--
> >
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> --
>
> Phil Rose
> Rochester, NY
> mailto:pjrose at frontiernet.net
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