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My question is closely related to one about a Jag dying at low RPM, but is slightly different because it only occurs after refueling and because the problem persists after cleaning the throttle body, as suggested by the answers.

The car is a 2006 Chrysler 300C, which occasionally dies at low RPM (e.g. at a stop sign). I can feel the RPM drop suddenly and see it on the tach; if they dip too low the engine dies. If I notice it fast enough I can rev the engine to keep it going. Sometimes the engine RPM will stutter while driving as well, but the engine will typically recover if the RPMs are high enough when it happens.

The problem only occurs shortly after filling up with gas and seems to be more likely the lower the tank was at fill-up, but I don't have much data on that. The problem occurs regardless of octane (87 and 89 are both approved for the Hemi engine) and subsides after several miles of driving, especially if it is not stop-and-go.

Several things have been done (some were just routine maintenance), but none have fixed the problem:

  • small leak in transmission fixed
  • throttle body cleaned
  • induction system serviced
  • spark plugs replaced
  • replaced fuel filter
  • flushed fuel system
  • checked out timing sensor
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When you fill do you stop fueling when the pump shuts off or do you give it a little more get it totally full?.Does it occurr if you only fill the tank to 3/4/full? –  mikes Mar 31 '12 at 20:44
    
@mikes I stop when the pump shuts off; I never top-off the tank. I haven't tried only a partial tank fill. I'm close to full now but will do that next time I fill up and update the question. –  Adam Wuerl Mar 31 '12 at 20:49
    
have you checked the fuel filter? –  warren Apr 10 '12 at 20:00
    
@warren Yes, see list above, 5th bullet. –  Adam Wuerl Apr 10 '12 at 23:59
    
How much did it cost to fix ? Because unfortunately I'm having the same problem? –  user2891 Mar 15 '13 at 15:15
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2 Answers

up vote 6 down vote accepted

The purge valve solenoid and vapor canister were contaminated with fuel.

Update: So the above is what the dealership said was wrong, and we got those parts fixed (several hundred $ IIRC). Unfortunately, the problem resurfaced. By that time we'd moved, so we took the car to a totally different dealership. They also could not reproduce the problem reliably and there was no code on the computer. They called around to a dozen or so other dealerships and ultimately came to the conclusion that the Hemi engines just do not idle well and some of them have a tendency to just shut off.

I don't have corroboration or evidence on this next bit, which is just my speculation, but I suspect that there is just a stack up of various tolerances and timings in the system and gains set in the automatic idle throttle controller in the car's computer that for some engines under some conditions stack up in a way that causes the engine to shut off unpredictably.

They said there was nothing they could really do to fix it. Ultimately we traded in the car because it became too frustrating to deal with, which was a shame because otherwise it was awesome.

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Replace fuses that go to computer shutdown, #11 &14 I think. Or re-seat all fuses in the fuse box under the hood. The spades on the fuses build up a thin corrosion that gives a voltage drop.[they got me for $1200] new computer and new plugs in my 2006 300c

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I no longer have the car to try this on, but hopefully your answer will help someone else. –  Adam Wuerl Oct 17 '13 at 4:56
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