sealandsky
Full Access Member
I'd like to tap in to the brain trust's vast pool of experience so I can lead my GMC dealer in the right direction (they can't lead themselves anywhere).
Vehicle: 2019 Yukon Denali - Callaway
Weather Conditions: Ambient temperature 20-50 degrees F
Vehicle Conditions: Not first run of the day, vehicle was at full operating temp (210 or so), shut down for 2-3 hours, re-start coolant temp 160-170
Fuel: BP 93 Octane
Situation: After driving to work and leaving my Yukon parked for a couple hours I'll restart to leave on an errand. After starting I'll drive out of my parking lot at idle or just above idle power. Either as I approach the street or after I turn on to the street and again apply very light power the engine will deliver a short hesitation and then a big jerk and surge of power - More power than I should be getting from throttle pedal position. In the old days before fuel injection I'd seen similar behavior from vapor lock in the fuel system. Is this what's happening? I'm also wondering if I'm getting bad fuel, it's happened over the last 4 tanks of gas and I buy my gas at the same station every time. One other thing I've noticed is a slight drop-off in power - seat of the pants feel is about 10-15%. I'm not getting a check engine light or any other unusual indications.After driving a couple hundred feet the issue clears up. I'll also add that when the issue occurs, it feels like I have no control over the throttle - in other words I'll get both less, then more power than I should receive with the selected pedal position.
Anybody have a theory that I can bring to my useless dealer?
Vehicle: 2019 Yukon Denali - Callaway
Weather Conditions: Ambient temperature 20-50 degrees F
Vehicle Conditions: Not first run of the day, vehicle was at full operating temp (210 or so), shut down for 2-3 hours, re-start coolant temp 160-170
Fuel: BP 93 Octane
Situation: After driving to work and leaving my Yukon parked for a couple hours I'll restart to leave on an errand. After starting I'll drive out of my parking lot at idle or just above idle power. Either as I approach the street or after I turn on to the street and again apply very light power the engine will deliver a short hesitation and then a big jerk and surge of power - More power than I should be getting from throttle pedal position. In the old days before fuel injection I'd seen similar behavior from vapor lock in the fuel system. Is this what's happening? I'm also wondering if I'm getting bad fuel, it's happened over the last 4 tanks of gas and I buy my gas at the same station every time. One other thing I've noticed is a slight drop-off in power - seat of the pants feel is about 10-15%. I'm not getting a check engine light or any other unusual indications.After driving a couple hundred feet the issue clears up. I'll also add that when the issue occurs, it feels like I have no control over the throttle - in other words I'll get both less, then more power than I should receive with the selected pedal position.
Anybody have a theory that I can bring to my useless dealer?
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