Turbo advise

olddog · #1 (**permalink**) 11-08-2020, 12:06 AM

Is this normal?

I tried holding the engine at a steady 1500 RPM in park, no load. I can get it to hold steady below 1500 RPM, but cannot choose what RPM it will hold a steady speed. Trying to control it above 1500 rpm is not possible. It will just keep climbing and if you try to back off the throttle a hair it will drop like a rock. If you target about 1600 rpm and lock the throttle by putting your foot against the tranny tunnel it will climb to 4000+ (I let off the throttle as I do not want to free rev it any higher). The higher the rpm the more rapidly it will climb. It seems like it is the turbo spinning up and moving more air through the throttle plate.

This is a 2.0 ltr 4 cylinder eco boost in a 2019 Lincoln Nautilus. It has both port and direct injection. It is a variable vane turbo, designed to keep the turbo rpm high at light load to eliminate turbo lag.

twobjshelbys · #2 (**permalink**) 11-08-2020, 08:03 AM

That don't sound right.

jetblue69 · #3 (**permalink**) 11-08-2020, 11:22 AM

It sounds like a TPS or MAP sensor issue. Maybe even a pedal positions sensor considering there's no direct connection between your foot and the TB these days...

It's a 2019 so is it still under warranty?

I'd let F/L/M deal with it!

spdbrake · #4 (**permalink**) 11-08-2020, 12:03 PM

Most likely its normal as the configuration you have it in is the Idle Relearn.

I'm guessing your foot on the pedal is hosing the relearn up.
https://www.morepowertuning.com/how-to-idle-relearn

olddog · #5 (**permalink**) 11-09-2020, 12:37 AM

Quote:

Originally Posted by jetblue69

It sounds like a TPS or MAP sensor issue. Maybe even a pedal positions sensor considering there's no direct connection between your foot and the TB these days...

It's a 2019 so is it still under warranty?

I'd let F/L/M deal with it!

It's brand new with no modifications. I never popped the hood since I bought it. I will be taking it to the dealer Wednesday, but I want to be prepared to explain both what it is doing and my suspicions.

I have issues with it on a cold start. When I pull out on my street, it will act like it doesn't have power. Push harder on the throttle and it will suddenly jump out from under you with a sudden massive power surge. I can hold the throttle just off idle, with my foot against the transmission tunnel to make sure I am not moving my foot, and it will slowly pick up speed and then jump out from under you, as if you moved the accelerator pedal.

So Friday I was waiting in the hospital parking lot while my son was have a medical procedure. Half hour procedure, but they didn't start until 3.5 hr after I dropped him off. Anyway I was listening to the radio, which requires touch screens and who know what to be powered up. After 3 hr I decided to start the engine and hold it about 1500 rpm to charge the battery back up. That's when I discovered the what I wrote in the first post of this thread..

spdbrake · #6 (**permalink**) 11-09-2020, 08:09 AM

You may want to review the TSBs located here.
https://www.carcomplaints.com/Lincol...lus/2019/tsbs/

and the complaints here. On page 5 there is a powertrain one that sounds like your issue. The AWD and FWD lists are the same.
https://www.nhtsa.gov/vehicle/2019/L...UTILUS/SUV/FWD

https://www.nhtsa.gov/vehicle/2019/L...UTILUS/SUV/AWD

olddog · #7 (**permalink**) 11-09-2020, 01:16 PM

Thanks spdbrake. None of these describe the surge in engine power that I get, but that may be a good thing, as in it may be as simple as the sensor on the gas pedal.

I do get an occasional hard shift. One time I was turning into a parking space, foot off throttle and on brake pedal. It shifted from second to first gear and momentarily locked the tires up. I am quite certain it shifted into first before it released second and locked everything up for about a tenth of a second. Very violent. I have told them about that too.

Gaz64 · #8 (**permalink**) 11-09-2020, 01:59 PM

I'm surprised you didn't have a flat battery after 3 hours of radio.

Luce · #9 (**permalink**) 11-09-2020, 04:13 PM

It wouldn't surprise me if this was normal. Modern cars are not intended to sit and try to hold a 1500 rpm idle unless the ECU is doing it for a reason.

I've tried doing the same on a few different cars in the heat of the day to get a little extra A/C while sitting in park in the sun waiting on something.

Gaz64 · #10 (**permalink**) 11-09-2020, 04:41 PM

Quote:

Originally Posted by Luce

It wouldn't surprise me if this was normal. Modern cars are not intended to sit and try to hold a 1500 rpm idle unless the ECU is doing it for a reason.

I've tried doing the same on a few different cars in the heat of the day to get a little extra A/C while sitting in park in the sun waiting on something.

That's exactly correct.

The ECM only NEEDS to open the throttle if the transmission is in gear, and foot off the brake. The throttle blade is ECM commanded when conditions are met, so IF the driver applies the throttle pedal and the brake pedal at the same time, the brake pedal has precedence.

Free revving the engine can be difficult in some cars, especially to hold a fixed speed. Most are rev limited to about 4000 while in Park or neutral.

olddog · #11 (**permalink**) 11-13-2020, 08:10 AM

Car is back from the dealership. No codes tripped. Ford told them to re-flash the engine and transmission ECUs.

After getting it back, it is possible to free rev the engine (in Park) and get it to hold a steady speed, but with great effort. You cannot pick an rpm and just rev it at that rpm. Dealer said this is normal on eco-boost engines.

The loaner vehicle was a 2020 Escape with a 1.5 Ltr Eco-boost inline 3 cylinder both direct and multi port injected. I could effortlessly Free rev the engine to any rpm I chose, just like every other engine I ever owned. I traded in a 2016 Escape with a 2.0 Ltr Eco-boost inline 4, but it was only direct injected, same thing.

This 2.0 Ltr Eco-boost inline 4 cylinder both direct and multi port injected is odd.