Q: 2003 Yukon stalls going down hill and at abrupt stops.

asked by on December 17, 2017

2003 Yukon stalls going downhill and at abrupt stops. Just completely shuts off, no other problems with acceleration or idling. Started happening after replacing the Fuel Pressure Regulator, thought it was the new regulator so i bought a second (different Manufacturer) same problem. Decided to change the spark plugs, but still the same problem Thank you in advance!

My car has 125000 miles.
My car has an automatic transmission.

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Hopefully, the two stalling scenarios have only one cause. Among the possibilities are a faulty torque converter lock up. You might be able to detect that with a sophisticated scan tool, such as the Tech 2. If the level of fuel in the fuel tank is low, or there is some strange debris "situation" in the tank, the sudden stop, or the downhill orientation might be blocking the fuel supply. This has happened with filters during sudden stops. If the filter has never been changed, that is certainly a harmless stratagem, especially as filters should eventually be changed. Overall, to rule out fuel supply as the issue, you can tee in a fuel pressure gauge and just simply monitor the pressure while driving during these incidents and see if pressure falls off precipitously during a sudden stop. If it doesn’t then the issue is not fuel and is probably electrical or transmission related. There have been cases where a vehicle stalls every time a left turn (for example) is made and the fault is traced to movement in a wire harness that momentarily interrupts a key circuit (a wire has a break in it). Your issue is resolvable though and I would suggest that you request a stalling diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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