2018 Trd Sport shuddering at low rpm

Redsox68 · Dec 19, 2023

I have an automatic 2018 trd sport 61000 miles. It's shuddering around 1500rpm, worse if I'm going uphill. I had the fuel pump replaced already. I had a similar issue before but it was just bad fuel. If I put ECT mode on it helps but it doesn't go away entirely. I'm gonna get the tranny fluid changed Thursday and see if that helps.

In the meantime, is it ok to drive the next 2 days? I commute about 20 miles to work. No dash lights are On.

na8rboy · Dec 19, 2023

Trans fluid change is a good start. Sounds like torque converter lockup/shudder. Your fine driving it.

PTSDTherapy · Dec 19, 2023

Get it out of low rpms for a start.

PTSDTherapy said: ↑

Not high enough rpm to get into the torque needed to push our aerodynamic brick down the road.

Do the calculations for torque at the rpm the engine is turning at 75 mph.

Factor in parasitic loss for all aspects of the drivetrain.

Now calculate the resultant wind resistance of the front of our brick on wheels.

What you are left with is a very small amount of torque left to maintain.

Engine needs torque which equates to downshift and raising the rpms.

Transmission is saying no don’t downshift we need to maintain fuel economy.

Torque converter doesn’t have enough pressure to maintain.

You feel the results.

Tune doesn’t mean squat when in 6th with a light throttle to maintain. Torque at given rpm is the same.
Click to expand...

Log in or Sign up

Welcome to Tacoma World!

2018 Trd Sport shuddering at low rpm

#1
Redsox68 [OP] Member

#2
na8rboy 18 DCLB Sport Cement

#3
PTSDTherapy Well-Known Member

Products Discussed in

Log in or Sign up

Useful Searches

Welcome to Tacoma World!

2018 Trd Sport shuddering at low rpm

#1 Redsox68 [OP] Member

#2 na8rboy 18 DCLB Sport Cement

#3 PTSDTherapy Well-Known Member

Products Discussed in Entire Site Forum: 3rd Gen. Tacomas (2016-2023)

#1
Redsox68 [OP] Member

#2
na8rboy 18 DCLB Sport Cement

#3
PTSDTherapy Well-Known Member

Products Discussed in