Thud under gas pedal when taking off

[jking05]

When I come to a stop and then hit the gas I can feel a thud coming from right under or behind the gas pedal under my feet. It doesnt do it every time but most of the time. Of course the dealer couldnt replicate it but wondering if anyone else has it or knows what it might be? They said they checked the suspension but everything was good.

 

[Wayne Decker]

The engine starting back up?

 

[aggiegrad05]

The engine starting back up?

(This was my thought initially too)

 

[jking05]

No the engine is running. When im at a stoplight or stop sign it does it when taking off.

 

[aggiegrad05]

Yes, but when you come to a stop your engine is going to shut off. And as soon as you lift your foot off the brake, it is going to start again which causes a slightly noticeable nudge in the pedals.

 

[Deadman]

Thats that stupid auto start stop

 

[Cigarguy]

I get the same thing. It’s most definitely not the auto stop/start. I spent 12 years in the car business. Many of those as a service manager. The auto start is blatantly obvious. This is more muted than that and feels like someone tapped the floor once with a rubber mallet.

 

[Wayne Decker]

Did you run over someone who was carrying a rubber mallet? Just a thought.

 

[Deadman]

I get the same thing. It’s most definitely not the auto stop/start. I spent 12 years in the car business. Many of those as a service manager. The auto start is blatantly obvious. This is more muted than that and feels like someone tapped the floor once with a rubber mallet.

I deleted my auto start stop junk so I don't know what that crap even feel like anymore! lol

 

[NukeLife]

Yes. I’ve felt it every so often. Very distinct solid mechanical thunk. My dealership couldn’t replicate it either. I’m leaning towards a torque converter issue.
Maybe it would be easier to replicate pulling a trailer? More load on it?