acceleration/power issue

notAmechanic · May 26, 2022

If this has already been asked, please point in the right direction. I have a 2015 GMC Sierra, 96K miles. This is really hard to explain. When getting into the throttle on take off, the truck will bounce and jump 3 or 4 times before taking off. It is almost like running out of gas. This issue has almost got me ran over cutting across traffic. If you get into the throttle easy this issue does not occur. Only on mid/hard acceleration. The tack will also bounce when this occurs. Sometimes the tack will quit all together, not every time. When the tack quits then i cant replicate the issue. I have to turn truck off and back on to get tack to function again. When this occurs it throws no codes or lights. If you have it hooked to a computer while driving it will give a crank sensor fault. I recently replaced the transmission and crank sensor. This issue happen repeatedly before trans. change. I have also recently replaced the high pressure fuel pump. If any one could point me in the right direction i would appreciate it.

WT35002017 · May 26, 2022

I personally have not had this problem but it seems that many of these trucks suffer from bad ground connection issues. Sometimes it is a ground connection installed on a painted stud and nut, sometimes it is the wire connected to the negative battery terminal. A bad ground connection can cause the issue you are having. Search this issue on the web, you will easily find videos of where they are and how to fix these known issues. Good luck!

rlcole321 · June 6, 2022

possibly bad plug wires, grounding to engine, try, when engine is hot, spaying water (spray bottle) around the spark plug boots, if bad wires you may see or hear the bad one(s) arcing to the engine causing misfire.

16LT4 · June 7, 2022

Tach gets its signal from CkPS, so it still reads like an issue with that sensor. Did you replace it with a quality sensor like Siemens, VDO, or GM Genuine? If not, the sensor is just new and not necessarily good. Don't forget to clean its connection and inspect its wires for a short.