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I turn on the car, wait for 30 seconds or so for it to warm up. Then, and only then, do I rev the engine ever so slowly.
I've read that old cars always needed a warm up period for the oil to circulate through the power train. New cars with the finely tuned engines and newer synthetic oils don't need that warm up period. Much of what I've researched on-line and talking to mechanics is that, as long as I don't red-line it, it should be fine.
But, I grant you this, revving the engine every morning is not something I really want to do. All I can say is that, after days of "Battery Charging" messages, then on the one day that I rev the engine, I get Auto Stop/Start to engage successfully.
I turn on the car, wait for 30 seconds or so for it to warm up. Then, and only then, do I rev the engine ever so slowly.
I've read that old cars always needed a warm up period for the oil to circulate through the power train. New cars with the finely tuned engines and newer synthetic oils don't need that warm up period. Much of what I've researched on-line and talking to mechanics is that, as long as I don't red-line it, it should be fine.
Ordinarily ok for some cars, but (and a big but).... Turbo... You don't necessarily have to spend a long time to warm the car up per se (30 seconds is great), but you do want to avoid spinning up the turbo for, say, 3 minutes or so. Switch over to your oil temp display, until you see oil temp beginning to show a bit of white, keep the boost way down (and no 15psi boost until you see a lot of white). Don't use the coolant temp gauge as reference, the oil temp is what you and your turbo care about.
Probably what you are doing sounds not too bad as there won't be much boost from a slow rev in park, but all that for saving $0.005 worth of fuel, not worth it IMO
As originally posted by me, I would like to provide my solution.
I came upon an article comparing 2 types of batteries designed for electronically-intensive SUVs: Absorbed Glass Mat vs. Enhanced Flooded Battery
(credit given: https://batteryworld.varta-automotiv...rkschemeovr=1#)
It turns out that my 2023 Lexus NX350 was shipped with an AGM battery which was replaced (at the 30-day inspection) with an in-stock EFB battery because the originally equipped AGM battery was not holding a charge. Since I purchased the car with an AGM battery and the car was only "30-days new-to-me", I asked the dealership to put back an AGM battery. They did. The Stop/Start feature has been working every day flawlessly since then. To charge the battery, there is no need to take the car on the highway and no need to rev the engine to wake up the alternator.
Of course, I still get the rare acceptable/understandable messages like (paraphrased) "For Climate Purposes" or "Unavailable" but definitely not that angst-producing "Battery Charging" message.Amongst the comparisons, the article recommended 2 take-aways: (Some might say its a marketing ploy to get you to buy AGM but it works for me!)
1. AGM is better than EFB.
2. If one has an AGM battery it should only be replaced with an AGM battery.
My 2023 Lexus NX 350 (gas-only) displays "Battery Charging" (along with the Auto Stop/Start icon) on the dash for days at a time every time I hard press the brake at intersections. The manual has a long list of situations when Auto Stop/Start "may not engage" (e.g Climate control situations which also require battery power) but the manual does not provide any guidelines to foster ideal driving conditions in order to eliminate or reduce this incessant message. Driving with climate turned off does not seem to improve anything.
After opening a case with Lexus Canada over several months, I was told that it is working "As Designed" and the case was closed. I do not know how they arrived at this conclusion even after the local service department told me they had no diagnostic tests specific to diagnosing Auto Stop/Start.
BTW.... At least they tested the 12V battery. The tests have come back healthy. I can only assume that there is not enough battery power available to restart the engine which is required if the Auto Stop were to engage. i.e. don't stop the engine if you can't restart it.
Anyone else have this problem? In one of the Lexus NX 350 ads, under the comment section, I found a negative review in which the customer pointed out they see a message that the battery was charging while the car was being driven. The review did not elaborate further. I can only assume that this customer may have been experiencing the same thing I have been.
Auto Stop/Start Battery Charging message on dash
yes I’ve been having the same issue going on 3-4 months. Stop start never works. Always says battery charging. 2022 NX. Bringing car in to have it checked this week. Will report back.
You're overthinking the feature too much. It really doesn't save much gas at all and that's assuming the conditions are ideal to allow it to work. The majority of owners with this feature on an ICE don't like it because of the abrupt starting and delay (myself included), unlike a hybrid where the ICE start-up is almost unnoticeable.
The gas savings isn’t the point. The point is you want every single feature on the vehicle to be operating properly. And I’m having the same issue and the stop start did work 95% of the time the first 28-32 months I had the car. Why has it stopped working the last 3-4 months?
The gas savings isn’t the point. The point is you want every single feature on the vehicle to be operating properly. And I’m having the same issue and the stop start did work 95% of the time the first 28-32 months I had the car. Why has it stopped working the last 3-4 months?
You might want to check your 12V battery and what is the state of charge. It could be low and that is why it cannot stop and run just on the 12V.
Your starter is also getting old and thus pulls more current and now needs a very good battery to work the start / stop feature properly.
The whole system is a failure and falls into the same category as AFM or DOD on GM cars.
How could the starter be getting old? Probably my tenth leased car in my life and never once had to even think about replacing a starter, which by the way I would never do. I would just hand the car in because it would be close to lease end.
And to be truthful I’m glad this problem started up in the last few months in a way because this will be the first leased car I will exercise purchase option on. I want them to figure out what’s causing this. Also having another issue which I think might be related to this but it’s a long story and don’t feel like posting it. Maybe after I bring the car in I will.
Lexus knows that using the start / stop function puts extra wear on the starter and battery.
The computer is programed to keep count of how many times this function operates. When a certain number of cycles occurs then the computer throws a message for you to replace such items, battery / starter, for they can not be relied on due to wear.
