Chrysler Repair: 1998 Chrysler Concorde stalls at certain temp., 1998 chrysler concorde, crank sensor

Question
QUESTION: Have a 1998 Chrysler Concorde (3.2 V6) with 134,000 miles. About 2 months ago it started stalling intermitently. Would stall and I could restart immediately. Now it stalls once every trip at a certain engine temp. I can almost predict when it will stall by keeping an eye on the temp gauge. When it stalls I cannot restart (cranks but won't start) for a minute or two. Then after it starts again it runs fine. Then it will do it again, at the same temp, on the trip home. Any ideas?

ANSWER: Hi Ron,
I suspect it is either a crank or a cam sensor that breaks down spontaneously as it warms up and recovers when it cools. Try the ignition key to get a fault code from the computer:"on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the odometer wintow to see if the mileage reading changes to show any four digit numbers preceded by a P. The crank fault is 0320, the cam is 0340. Let me know if you get something other.
Roland

---------- FOLLOW-UP ----------

QUESTION: Thanks Roland. You obviously know what you are talking about. But I am not sure the crank/cam sensor is the problem. I replaced the crank sensor about 2 years ago. The only code I get is P1684, which I believe indicates lost electrical power. Yet there are no other indications of electrical power loss. And the car runs fine after reaching that temp and higher. In fact, I think I have managed to keep it running, on occasion, by racing the engine at higher RPMs just about the time (temp) it normally stalls. After exceeding that temp point it does not stall. I suppose it could be the crank sensor going bad again, it was an after-market unit. But as I recall, when I had the crank sensor problem it did have a code indicating a crank sensor issue. Is there a temp sensor that could cause this?

Answer
The 1684 means that sometime in the past 50-100 key cycles the power to the pcm was lost. Usually that happens if you disconnect the battery for some other reason. But if that hasn't been done, then you might have a flaky battery connection or ignition switch, so consider that possibility. The coolant temp sensor is located next to the thermostat housing (at the front of the lower left side of the engine next to a radiator hose) and it should drop in resistance to 700-1,000 ohm when the engine gets to operating temp. When cold it should be arount 4,000 ohms.  If not, the engine will run too rich. So remove its plug and measure across the terminals. The wire colors are tan/black and black/light blue.
Roland