1995 Concorde 3.5 Cold start problem

When the temp drops below 40deg F, it won't start. Been chasing this for
year and about out of ideas.There no codes. Once it is started it runs great
and after the first start of the day, it will start all day long. If you
hold the throttle wide open, sometimes it will sputter and start and appears
to be rich and will run normally once running. Took it to the dealer for
computer trouble shooting nothing but $45.00 for the hookup no problems they
could find. I have checked or replaced the following:
All vacuum hoses
Ck'd the electrical connections
Replaced both 02, MAP, Intake air sensors and cleaned the butterfly and
injectors.
Throttle position and idle speed motor cks out electrically.

Any thoughts or suggestions would be appreciated.

 

For a cold start problem you may want to make sure the coolant Temp sensor
is reading properly. if it is cold outside and the sensor is reading hot you
will have a hard time getting it started, Leave the car overnite for a cold
scan test with a scanner
GlennBeasley
Chrysler Tech

 

first check vacum to see if it's below 15 hg this might help decide if the
timing belt is off. does the cruise lite come for no reason????
if it is i would look at the map sensor operation again and then i would take a
heat gun to the puter and warm it up and if it works more better then on cold
starts then you are in the ballpark. what about the coolant temp sensor????

 

I'm having a similar problem with a 93 3.3 Please let us know if the
coolant temperature sensor replacement solved your problem.

thanks,
Nick

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If it is one of the sensors i would bet "129%" it is the coolant temp sensor
giving the wrong signal to the pcm, if it is cold outside and the sensor
tells the pcm it is hot, it will not allow the injectors to stay open long
enough for the cold start thus making it stall, back fire and just run like
crap, The coolant temp sensor has no idea what the acuall temp is therfore
it will not set a code if it is out of calibration, it will only set a code
for an open or shorted circuit . A simple scan of the sensor as the vehicle
is cold with confirm the reading.. Sorry Matt W

=-----

 

I had a similar problem on the first start of the day but it wasn't related
to temperature. I have 3.3L 94 Concorde and the problem turned out to be a
fuel pressure sensor that was easy and inexpensive to replace. I would
occasionally smell raw gas as it was leaking backwards into the intake. The
short rubber hose connected to it was also in bad shape from age and needed
replacement. I didn't have an error code displayed on this problem either.

Hope this might help.

Dave