I've got a problem with a Chrysler 300M - if you drive for a little more than an hour it will stop- all the lights on the dash come on and it will crank but won't fire. IIf you wait for 30 minutes it will fire right up and will behave as if nothing had ever happened. (For the next hour of driving- then it'll stop again). There are no codes in the 'puter.....
If you have any ideas as to what could cause this I'd be glad to hear them.

AlpineRAM

 

Fuel pump, or fuel tank vent issues? Try running with the fuel cap loose and see if it continues to run. A simple but not totally dependable test for the pump is just listen and see if you can hear it running when you first turn the key on, it may only run for a few seconds till it cycles off. And of course just because you can hear it doesn't mean it's pumping.

On the other hand, my suggestions may be totally off base on a late model car like yours.

Good luck, RJR

 

Hey Marcus!

I don't have a clue for your troubles with that car, but this is the first time I have seen you since the new year. Hope everything is going well on that side of the pond for you and yours!!!!

We now return you to your regular programming.

 

AlpineRam,

A few years ago, I had a gasoline Dodge truck that used to do what you have described. It was the computer. When the computer heated up, it would simply stop running. The truck would crank, but not start. Fifteen or twenty minutes later, it would start up and run fine until the next event. I don't know if your vehicle has anything similar to what my truck had for a computer, but it might be something close.

Tom

 

Thanks folks! I am also leaning towards a PCM issue. Especially since there are no codes. Running it with the fuel cap off would just give a check engine light (emission related)
Does anybody have a ballpark price for a PCM for a 99 Chrysler 300M?

OT- Lary: I've been a busy boy for the last few days. Had some issues with my truck (t-stat, coolant contamination, oil leak, rodent damage on some cables) and a lot of fun with one customer filing bankupcy and another unable to pay- bad thing was that these two made up about 80% of my revenue. Something else to do before X-mas were the annual charityrunning events- looking good so far -It's about a computer with a special keyboard for a handicapped kid this year.

AlpineRAM

AlpineRAM

 

Nothing to add except agreeing on the PCM, but wanted to say Happy New Year to you and yours. Understand about the $$. Kinda had the same thing happen. Sure does make for interesting times, huh.

Need some P-Nut butter?

Ed

 

I would post this @ Allpar.com forums.If Sully or Techman answers you they are working Mopar techs and are pretty good with their diagnosis. Good luck. Ron

http://www.allpar.com/forums/index.php?

 

i would carry a small cooler with ice in a plastic bag. when it stops i would attach the bag of ice to the puter see if it changed the amount of time it took to restart. if it is heat related it should change something.

 

Not a bad idea. Except I would but a few beers in the bag so I could be entertained for a half hour.

Have you checked the battery?

 

We had a boat that used to do that. The ECM would heat up and quit. Sit out in the middle of the channel for a while and it would fire back up. $260 for the ECM.
Secretary's Chevy Cavalier did the same. Her ECM was bolted to the back side of the engine. It was a bear to get to.
Good luck with 'er...

 

I hate these public service announcements!

 

A guy I work with had the same problem with his 99 LHS, it ended up being his crank position sensor. If you pull a plug and it cranks with no spark, that may be your problem.

 

Thanks a lot folks!
I've removed the PCM today and had a look at it- also got the battery out and did a load test (Who was that - not proper for a family website- who thought of that battery location and the tiedowns?)- and on a test drive I found that the fuel gauge is guesstimating more than anything else. Funny thing is that it won't set a code even when keeping it sputtering and misfiring (lack of fuel) for some time.
All the contacts to the PCM and some others were corroded- had to redo them. I think I'll try it now with some more fuel in and see what it does
Fun thing to say is that some previous tries to get the vehicle to run must have involved cutting lots of wires and reconnecting them in a very shoddy fashion.

Well tomorrow is another day to try to troubleshoot it

Have a nice day!!

AlpineRAM