This engine has been transformed into an entirely different engine by being electronically controlled. So…
It’s a diesel engine, but the battery is the life!
If it’s a gasoline car, the quality of the battery will change the condition of the engine, but late model 4M40 diesel engines will also vary in engine performance depending on the quality of the battery!
I guess it’s no surprise since the fuel injection and various control systems are controlled by electricity.
In fact, in the past, when one of the terminals on the two batteries that are attached to the car had bad contact, I thought, “What the hell? What’s up with the acceleration? Many times I felt like, “I’m not feeling so good today!
Diesel engines are all OK once you start them.
There was a time when it was said that it was a good idea, but not from this car.
Electricity is the most important thing to a diesel engine.
Beware of cold-weather vehicles that come with two batteries, only one of the two batteries may be connected!
The cold-weather version of the car has two 85D26Rs connected in parallel, but there were often times when the terminals were loose and only one battery would function. In that case, I always had the following symptoms
My acceleration is not good.
You can hear crunching and crunching and knocking under acceleration.
The digital clock and temperature indicator display is strange.
It’s hard to start the engine.
When you turn off the engine, it stops with a thud.
There’s a (slight) shift shock.
When you turn on the blinkers, the position lights go brighter or darker together.
The power window doesn’t work as well as it used to.
Battery life? There are a lot of symptoms like that, but if that’s the case, try opening the hood and lightly twisting each terminal or tightening the nuts. If the nuts are loose or if you find terminals that move easily, bingo! Press in firmly and tighten securely. The above symptoms will disappear.
Strong batteries are the best tune-up.
It’s not just the acceleration and the electric gauge display that I felt after improving the poor contact.
The engine noise also becomes quiet.
I don’t know what the cause and effect is, but this car has electronic control of fuel injection, intake airflow, EGR, transmission, everything!
If the power supply is weak, various controls will not work properly.
You may be experiencing problems with normal combustion in the cylinder or not having adequate electronic control due to lack of power. (Causes of shifting shocks, knocking noises, etc.)
Otherwise, I can’t explain it.
But if you do it with a good battery connected properly, the symptoms that bother you will disappear nicely.
If you don’t care about it, it’s not a problem, but if you’re as concerned as I am, I’d recommend checking the contact between the battery and the terminal first, instead of dealing with each symptom separately.
By the way, a battery with bad contact won’t provide power, but it won’t charge either.
Possibility of failing to pass vehicle inspection due to poor battery contact
When I still didn’t know what was causing the engine malfunction, I asked an acquaintance to bring the car in for inspection (to the DMV’s inspection station) and he told me that he had a hard time with the emissions ・・・・. He said he needed two bottles of fuel additive for emission control when he would normally only need one bottle.
So I wondered if the battery terminal was in bad contact? So I replaced the battery terminal and asked for another inspection of the car. I did, and this time I was told that there were no harmful substances coming out of the car’s emissions.
He said that the exhaust gas test was OK without any additives.
From this, you can see that the contact between the battery and the terminals of the late 4M40 has a great effect on the condition of the engine.
Poor contact is common after battery replacement｜Clips should be tightened after battery replacement!
For some reason, it seems to be prone to poor contact when replacing it with a new battery. I think the cause of the poor contact is a deformed terminal clip.
The terminal clips on the battery are probably deformed from being tightened too hard for too long. In other words, it’s not a clean cone, it’s an oval shape.
If you put the deformed clip over the new cone battery terminal, it won’t adhere to the new cone. If you tighten it up tight, it might be fine then, but as you get more and more comfortable with it, it will loosen up again for that amount of time.
You might want to re-tighten the clip from time to time after replacing the battery, or you might want to get a new clip at the same time as the battery.