2007 Buick Lucerne Intermittent Stalling

[Scott112118]

Hi, I have the same problem. I have 2003 Buick lesabre, car ran fine with no problems. I left it parked at my moms for 2 weeks next time I drove it it stalled on me driving 5o mph. I pulled over, popped the hood took off engine cover and saw a lot of acorns on top of the intake/upper plenum. I think a squirrel or chip munk chewed on some wires but I can't find any chewed on. Its driving me crazy tring to fiqure this out, cuz sometimes I can drive the car for a whole day and it won't stall once, other days all it does it stall on me, like 5-6 times just getting to work in morning. I don't think its a fuel problem cuz I replaced the fuel pump because the gauge didn't work, replaced the fuel filter and with the car running it has 50psi fuel pressure. If anything I think it might be spark related. Online ive read that the problem might be: coil pack, ignition control module, crank position sensor, mass air meter, but I don't have any dtc's to tell me what exactly it is. I don't wanna start throwing parts into it without knowing exactly knowing what is the problem. It just really weird that the car ran fine and 2 weeks later it stalls. I noticed that rite before it happens, the cruise control stops working and the traction control light comes on?

Had same issue for 1.5 yrs and a dealer mis diagnosed after I was frustrated trying to find issue for a year. Replaced crank and cam sensor. Ignition control module, ecu and had reprogrammed. Ended up stalling 3 months to the day I got it back from dealer and found issue to be bad pin fitment at the red wire on Ignition control module. Farthest wire to left when looking under hood from fro. Of car. The way I diagnosed it was back probing icm wires at 14 pin connector and when I back probed that power wire and hit the autostart button once I flipped hood latch it turned over and cranked right up, when I pulled probe out it stalled. Did that 3 times and repaired female pin and cleaned the male pins on ICM here were are 4-5 yrs later and she has been solid.

 

[Scott112118]

Sounds like good info. Thank you for posing this. Im going to tear into it tomorrow to inspect wiring under hood. Ive replaced crank sensor and coolant sensor as it went out once once after stalling suddenly on highway(no mifire or rough running motor it just dies) and usually just clicks as if the starter solenoid is bad but starts eventually afterwards(seemes to help if i turn motor over by hand or manipulate wiring to cam sensor). ive also replaced battery in it after these issues started. When i replaced crank sensor as far as i could tell that wiring looked ok but the plastic conduit fell apart making me wonder if the wires were overheating as it seems to do it more often when at operating temp so after inspection i installed new conduit. I really want to see the wiring behind exhaust manifold as i feel the issue is most likely there(13 yrs old and the conduit was that brittle)

It was loose pin fitment at red power wire 14 pin connector ICM. Repaired 59k mikes 4-5 yrs ago and it's been solid. Still can't believe these dealers and manufactures get away with this BS and it has only gotten alot worse since 07. I would never buy a vehicle newer than 07. Also won't buy from any dealer or lot only private cash deals. I can't stand con artists corporation's and salesmen.

 

[RD_Atlanta]

I had the same thing. The way I found it on a LeSabre was very easy and free, while the engine was running at idle, I wiggled each wire on the ICM connector and when I wiggled one wire, it would stall. It appears the spring tension that contacts the female pin gets relaxed. I was able to release the female pin from the connector, re-arc the spring and reinstall it.