1999 Chrysler LHS starting problems

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')

fuel pressure would be what i would check after i checked for any freeze
frame data a pending code may be there but not under continuous codes

"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

you apperantly haven't worked on too many gm cars

Bob Shuman wrote:

> 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" > wrote in message
> ...
> On Aug 13, 6:01 am, "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
>
> 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.

we have seen a two fold increase in fuel pump failure since gas prices went up

the fuel is not in the tank to help keep it cool


Steve wrote:

> 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.

I didn't realize that GM made the 1999 Chrysler 3.5L LHS! Seriously, I have
stayed away from GM products since having some bad experiences with a couple
of used 1970's and a brand new 1980.

Bob


"man of machines" > wrote in message
...
> you apperantly haven't worked on too many gm cars
>
> Bob Shuman wrote:
>
>> 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" > wrote in message
>> ...
>> On Aug 13, 6:01 am, "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
>>
>> 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.
>