Throttle Surge While Backing Into My Garage At Idle. 2018 TRDOR

Basically every A/C compressor ever made works the same way. The 12v electromagnet locks the clutch up and this basically doubles the load on the motor. Toyota was a little aggressive with their factory tune 2016-18. The motor overcompensates with too much throttle.

There's a TSB for this issue and they will reprogram your ECM which helps alleviate the surging issue.

 

My 2018 does this and it's NOT an A/C surge. It seems to be that if you're creeping in drive that the smallest steering input causes the idle to jump. It's really noticable when the coolant is cold. The TSB for the steering induced surge does not list 2018's as applicable unless there's a revised TSB out that not part of the sticky thread.

 

It's caused by ANYTHING that turns on or simply requires power to operate. Power steering, AC compressor, anything. It's not noticeable at higher rpms because the engine is providing plenty of power for the forward or rearward motion of the vehicle and the accessories. At idle the accessory may require more power than the engine has at idle or the added draw of the accessory may cause an engine stall. So instead of stalling, the computer raises the RPM of the engine to compensate. Unless your driving an older vehicle, this condition effects you no matter what it is you drive within reason.

 

Mine surges during cold startup. Fine after warmed up.

 

I don't think people here get it. The jump in RPM is enough where even I thought I was going to stick it through a wall when pulling into my garage. I've never had a vehicle that does this. It's almost like the idle air valve is being commanded to over compensate.

 

Does anyone know if there's be an update to this TSB since it was released? Mine is a 12/17 build

https://imgur.com/a/Q5NTmhR

 

Happens to me.

As said above it could be an AC surge. But Recently I have not been using the AC and it happens when i turn the steering wheel when backing in (power steering)

 

They do but this is a Toyota site.

 

I have a late build 2017 OR that had the surging, even without steering input, even on very warm days before the engine ran for few minutes. I had the original TSB already flashed from factory, and had the newer TSB just done. Absolutely nothing changed. It still surges, with and without steering input unless I let the engine run long enough, sometimes 3-4 minutes depending on the outside temperature. I've been driving for 31 years and have never experienced a truck or car or van or suv that has had a surge like this.

 

dealt with the same shit a couple times now as well

 

I see this thread is a couple months old, and everyone's probably tired of talking about it. I just joined forum and was searching for the surge issue. I scheduled a service call for my 2018 Tacoma, which I bought the end of 2018, for the radar sensing module recall. I had planned to mention the idle surge, but from reading these posts, it sounds like there's not much to be done about it.

 

I would still have them perform the TSB associated with the issue when you take it in. I would describe the problem you are having in the same manner that it is worded in the TSB. Some have said it reduces or eliminates the problem, though it has not worked for my truck.

 

The TSB doesn't affect the surging issue. My 18 does it every time you turn the wheel 2-300rpm jump. If I not using the accelerator I can turn the wheel to go forward even a small incline due to the increase in rpm. AC makes it fluctuate, hell even the windows make it surge a lil bit. Like I can go through the drive thru just turning the wheel. Ive also owned probs 30 vehicles and this is the only one that has ever done it. Driven 3 3rd gen tacos and they all have it, some seem worse than others, same with the trans and shifting crap

 

Thanks. I'll talk to the service guy about it, although if it specifically describes a high altitude fix, it may be a hard sell. I'm about 900' asl here. My symptoms are exactly what you describe (Riotfunk). I guess if you are aware it's going to happen, you can prepare. Still seems like a poor design.