Hi,
I have a 1999 LHS which will not start when warm. If cold, the car
starts right up and drives smoothly, with no problems at all. However,
after the car is driven for a while and turned off, a re-start is
problematic. Usually it will just crank and crank, but sometimes it will
spit and cough. After waiting until the car has cooled down, like
overnight, it will start right up and drive smoothly, with no stalling
or other problems. There are no trouble codes stored, nor does the CEL
come on. The car has about 106K miles, and the plugs, timing belt, etc.,
have been recently replaced, with no change. The gauges, dash lights,
etc. all work correctly.
Anyone have any ideas for me?
Thanks,
S

"Scott W." <swbusadd@sbcglobal.net> wrote in message
news:R9zok.16623$LG4.11591@nlpi065.nbdc.sbc.com...
> Hi,
> I have a 1999 LHS which will not start when warm. If cold, the car
> starts right up and drives smoothly, with no problems at all. However,
> after the car is driven for a while and turned off, a re-start is
> problematic. Usually it will just crank and crank, but sometimes it will
> spit and cough. After waiting until the car has cooled down, like
> overnight, it will start right up and drive smoothly, with no stalling
> or other problems. There are no trouble codes stored, nor does the CEL
> come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> have been recently replaced, with no change. The gauges, dash lights,
> etc. all work correctly.
> Anyone have any ideas for me?
> Thanks,
> S

If your looking to take shots at fixing it you can try a cam and crank
sensor. Otherwise a scan tool will be needed to monitor these sensors as the
problem is occurring.

Glenn Beasley
Chrysler Tech

"maxpower" <gjbeasley@comcast.net> wrote in message
news:B7ednQujadueqj7VnZ2dnUVZ_rrinZ2d@comcast.com. ..
>
> "Scott W." <swbusadd@sbcglobal.net> wrote in message
> news:R9zok.16623$LG4.11591@nlpi065.nbdc.sbc.com...
> > Hi,
> > I have a 1999 LHS which will not start when warm. If cold, the car
> > starts right up and drives smoothly, with no problems at all. However,
> > after the car is driven for a while and turned off, a re-start is
> > problematic. Usually it will just crank and crank, but sometimes it will
> > spit and cough. After waiting until the car has cooled down, like
> > overnight, it will start right up and drive smoothly, with no stalling
> > or other problems. There are no trouble codes stored, nor does the CEL
> > come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> > have been recently replaced, with no change. The gauges, dash lights,
> > etc. all work correctly.
> > Anyone have any ideas for me?
> > Thanks,
> > S
>
> If your looking to take shots at fixing it you can try a cam and crank
> sensor. Otherwise a scan tool will be needed to monitor these sensors as
the
> problem is occurring.
>

I thought that it was only the 1995 and earlier computers that did NOT set a
code when the crank sensor failed intermittently?

It certainly does sound like the textbook crank sensor, though.

Ted

"Ted Mittelstaedt" <tedm@toybox.placo.com> wrote in message
news:newscache$uc1l5k$my1$1@news.ipinc.net...
>
> "maxpower" <gjbeasley@comcast.net> wrote in message
> news:B7ednQujadueqj7VnZ2dnUVZ_rrinZ2d@comcast.com. ..
> >
> > "Scott W." <swbusadd@sbcglobal.net> wrote in message
> > news:R9zok.16623$LG4.11591@nlpi065.nbdc.sbc.com...
> > > Hi,
> > > I have a 1999 LHS which will not start when warm. If cold, the car
> > > starts right up and drives smoothly, with no problems at all. However,
> > > after the car is driven for a while and turned off, a re-start is
> > > problematic. Usually it will just crank and crank, but sometimes it
will
> > > spit and cough. After waiting until the car has cooled down, like
> > > overnight, it will start right up and drive smoothly, with no stalling
> > > or other problems. There are no trouble codes stored, nor does the CEL
> > > come on. The car has about 106K miles, and the plugs, timing belt,
etc.,
> > > have been recently replaced, with no change. The gauges, dash lights,
> > > etc. all work correctly.
> > > Anyone have any ideas for me?
> > > Thanks,
> > > S
> >
> > If your looking to take shots at fixing it you can try a cam and crank
> > sensor. Otherwise a scan tool will be needed to monitor these sensors as
> the
> > problem is occurring.
> >
>
> I thought that it was only the 1995 and earlier computers that did NOT set
a
> code when the crank sensor failed intermittently?
>
> It certainly does sound like the textbook crank sensor, though.
>
> Ted
>
>
Whether it sets a code or not a scanner connected to the vehicle as the
problem is occurring will see that the cam or crank signal went dead


Glenn

On Aug 13, 6:01*am, "Scott W." <swbus...@sbcglobal.net> wrote:
> Hi,
> I have a 1999 LHS which will not start when warm. If cold, the car
> starts right up and drives smoothly, with no problems at all. However,
> after the car is driven for a while and turned off, a re-start is
> problematic. Usually it will just crank and crank, but sometimes it will
> spit and cough. After waiting until the car has cooled down, like
> overnight, it will start right up and drive smoothly, with no stalling
> or other problems. There are no trouble codes stored, nor does the CEL
> come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> have been recently replaced, with no change. The gauges, dash lights,
> etc. all work correctly.
> Anyone have any ideas for me?
> Thanks,
> S

Max & Ted sound like they are quite knowledgeable here but I have had
cold start/warm start sensors that can affect cold or in your case
warm start problems,but I am unsure if these are used on your
application just a thought.

I've never seen a defective Coolant Temperature Sensor actually prevent
starting, but have observed the case where an already warm engine is
difficult to start (the spit and cough referenced?) because the defective
CTS makes the ECU believe the engine is cool, so enriches the fuel mixture.
When this happens, the engine temperature gauge usually does not read the
correct temperature, the warm engine idles roughly, and the fuel mileage is
noticeably decreased.

Since it won't start at all, and there are no references to the other
symptoms, I'd put my money on the cam or crank sensors.

Bob

"2oldskool55" <circles34a@yahoo.com> wrote in message
news:71e22187-a049-413a-bdec-d5aa914922cf@k7g2000hsd.googlegroups.com...
On Aug 13, 6:01 am, "Scott W." <swbus...@sbcglobal.net> wrote:
> Hi,
> I have a 1999 LHS which will not start when warm. If cold, the car
> starts right up and drives smoothly, with no problems at all. However,
> after the car is driven for a while and turned off, a re-start is
> problematic. Usually it will just crank and crank, but sometimes it will
> spit and cough. After waiting until the car has cooled down, like
> overnight, it will start right up and drive smoothly, with no stalling
> or other problems. There are no trouble codes stored, nor does the CEL
> come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> have been recently replaced, with no change. The gauges, dash lights,
> etc. all work correctly.
> Anyone have any ideas for me?
> Thanks,
> S

Max & Ted sound like they are quite knowledgeable here but I have had
cold start/warm start sensors that can affect cold or in your case
warm start problems,but I am unsure if these are used on your
application just a thought.

"Bob Shuman" <no_spam_thx@sbcglobal.net> wrote in message
news:jBkpk.17906$cW3.17560@nlpi064.nbdc.sbc.com...
> I've never seen a defective Coolant Temperature Sensor actually prevent
> starting, but have observed the case where an already warm engine is
> difficult to start (the spit and cough referenced?) because the defective
> CTS makes the ECU believe the engine is cool, so enriches the fuel
mixture.
> When this happens, the engine temperature gauge usually does not read the
> correct temperature, the warm engine idles roughly, and the fuel mileage
is
> noticeably decreased.
>
> Since it won't start at all, and there are no references to the other
> symptoms, I'd put my money on the cam or crank sensors.
>
> Bob
>
> "2oldskool55" <circles34a@yahoo.com> wrote in message
> news:71e22187-a049-413a-bdec-d5aa914922cf@k7g2000hsd.googlegroups.com...
> On Aug 13, 6:01 am, "Scott W." <swbus...@sbcglobal.net> wrote:
> > Hi,
> > I have a 1999 LHS which will not start when warm. If cold, the car
> > starts right up and drives smoothly, with no problems at all. However,
> > after the car is driven for a while and turned off, a re-start is
> > problematic. Usually it will just crank and crank, but sometimes it will
> > spit and cough. After waiting until the car has cooled down, like
> > overnight, it will start right up and drive smoothly, with no stalling
> > or other problems. There are no trouble codes stored, nor does the CEL
> > come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> > have been recently replaced, with no change. The gauges, dash lights,
> > etc. all work correctly.
> > Anyone have any ideas for me?
> > Thanks,
> > S
>
> Max & Ted sound like they are quite knowledgeable here but I have had
> cold start/warm start sensors that can affect cold or in your case
> warm start problems,but I am unsure if these are used on your
> application just a thought.
>
>

It could go both ways, the coolant sensor could also tell the PCM that the
engine is hot when it is cold. This will cause problems. Either way a good
scanner and someone that knows how to use it will see the problem


Glenn Beasley
Chrysler Tech

Bob Shuman wrote:
> ...When this happens, the engine temperature gauge usually does not read the
> correct temperature, the warm engine idles roughly, and the fuel mileage is
> noticeably decreased...
>
> Bob

That is in fact correct on this car since there is one temp. sensor that
feeds into the PCM, from which signal the PCM both drives the gage and
does the engine management.

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')

Scott W. wrote:
> Hi,
> I have a 1999 LHS which will not start when warm. If cold, the car
> starts right up and drives smoothly, with no problems at all. However,
> after the car is driven for a while and turned off, a re-start is
> problematic. Usually it will just crank and crank, but sometimes it will
> spit and cough. After waiting until the car has cooled down, like
> overnight, it will start right up and drive smoothly, with no stalling
> or other problems. There are no trouble codes stored, nor does the CEL
> come on. The car has about 106K miles, and the plugs, timing belt, etc.,
> have been recently replaced, with no change. The gauges, dash lights,
> etc. all work correctly.
> Anyone have any ideas for me?
> Thanks,
> S


Will it fire right up if you crank it with the accelerator held to the
floor (just like clearing a flooded condition on a carbureted car)? If
so, you probably have a leaky fuel injector.

If not, check the fuel pressure. The fuel pump could be in the early
stages of failing and may not start running when its hot.

Greg Houstong wrote:
> Bill Putney wrote:
>> Bob Shuman wrote:
>>> ...When this happens, the engine temperature gauge usually does not
>>> read the correct temperature, the warm engine idles roughly, and the
>>> fuel mileage is noticeably decreased...
>>>
>>> Bob
>>
>> That is in fact correct on this car since there is one temp. sensor
>> that feeds into the PCM, from which signal the PCM both drives the
>> gage and does the engine management.
>
> Since the engine instruments are all computer driven, would a bad temp
> sensor also show erroneous temperature readings on the engine
> temperature guage?

That was my point ("...there is one temp. sensor that feeds into the
PCM, from which signal the PCM both drives the gage and does the engine
management.").

Bill Putney
(To reply by e-mail, replace the last letter of the alphabet in my
address with the letter 'x')