Chrysler Repair: 94 Chrysler LHS stalling: code 51, air intake hose, chrysler lhs

Question
QUESTION: My 94 LHS has just started stalling today. I moved the car to the side of the house and shut it off. I thought it odd that I smelled gas but went about my business. The next day I drove it about five miles and parked it for about two hours. I went out to go to the store and before I got out of the drive way it died. I restarted as usual and went about a mile and it died again. I restarted again and it immediately died again. Once again I restarted and continued on to the store and them home with out any more trouble. The car has just over 100k with a 3.5 six. I normally use mid grade fuel however the last time I gassed up I put regular in it.

ANSWER: Hi Monty,
Use your ignition key to see if the computer has logged any fault codes:"on-off-on-off-on and leave on" doing that in 5 seconds or less elapsed time. Then watch the check engine light, which remains 'on', to see if begin to flash, pause, flash, etc. Count the number of flashes before each pause. Then repeat to be sure of an accurate count set. Let me know the counts in order of appearance and we'll go from there. I have some suspicions but the fault codes are helpful.

Roland

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

QUESTION: Hi Roland,

hope you had a good vacation. The stalling issue seems to be taken care of, however I now have a code 51 oxygen feedback stuck at lean position. I have no idea were this is or how to get it unstuck. please help. when looking around at the engine when I had the last problem I noticed a hose at the firewall side of the engine that looked collapsed. It was very flimsy looking so we replaced it with a metal tube could this have anything to do with the currant problem?

Answer
Hi Monty,
There are two oxygen sensors, one on the side of each exhaust manifold (remove the air intake hose to see the one on the passenger side). Unfortunately the code doesn't say which one is at fault. If you want to check the voltage on each you will find the signal wire to be tan/white on the harness that connects on the passenger side and black/dark green on the left. If the voltage on either of those wires while the engine is heated and running is closer to 1.0 volt that would be the 'lean stuck sensor' is bad if not both.
The sensor looks like a spark plug and changes out the same way. You may want to buy a tap (18mm x 1.5 +6E) to clean the threads of the hole in the manifold after you remove the old sensor. You may want to spray the old one at the thread/manifold interface with penetrating oil and let is soak in overnight before trying to remove the old sensor. Also run the engine to heat the manifold and perhaps make the threads release more easily when you try to remove it. The new sensor comes either with pre-applied thread grease of a tube of such to apply to the threads. Tighten the sensor about that same as you would a spark plug being careful not to damage the delicate wires.
The hose you replaced, if it affected the mixture might be the cause of the code. You could disconnect the battery which erases all codes, except 12, and then see if the 51 comes back or not.
Roland