Silverado Reduced Power During Acceleration?

alkaspeltzar · February 10, 2018

2014, Silverado 5.3L, 3.42 rear end, 85000miles. Fuel induction services performed, throttle body cleaned, MAF sensor replace, new spark plugs and wires, top tier gas etc.

Keep having times when I accelerate from a stop sign or red light, where the truck appears to have reduced power. It will take off normal, but when it shifts into 2nd or 3rd, its like it falls on its face. You can hear the motor even lug down. Like reduced power, or stuck in wrong gear or like brakes are hanging on.

If you push the engine to the floor, it WILL NOT DOWNSHIFT. Youll hear the motor bog as if it is lugging. It kinda chokes thru it and eventually comes back to life with throttle response.

THis happens over 5 second period from the stop, feels dangerous as I have no controls. Dealer taking it again and giving it this time to transmission guy to drive for a day or two with data logger.

Any help? Thank you

Sierra706 · February 10, 2018

That describes what happens with mine when traction control comes on in snowy conditions. Any lights flashing?

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muddkatt · February 10, 2018

Don't know on the DI engine, but sounds like a lack of fuel to me. Had that happen a lot back in the old mechanical fuel pump and carburetor days. Only had it happen once on the 2001 Sierra, was a clogged fuel filter.

alkaspeltzar · February 10, 2018

No lights but yeah kind a like traction control. I thought fuel but then I figured I have that during passing and that never happens. Only happens during take off from dead stop