I think that the preheating control system is meticulously controlled, but the more important glow plug is that the Late type 4M40 uses short-lived parts that are “very cheap” than the Early model 4M40.
Unlike the early model, the late model has a cheap plug
It seems that there were two types of 4M40 glow plugs. [Ceramic plug] that was installed from 1994 to 1997 when it was launched, and [Metal plug] that was installed until the end of sales from 1998 to 2001.
Four ceramic plugs made by Denso cost about $200, and four metal plugs made by Bosch cost about $100.
The metal plug assembled in this late model is not good. It’s half the price of a ceramic plug, so I think it’s kind to a wallet, but it’s a performance that betrays those who love the L400.
In the early model 4M40, there was a lot of troubles such as [starting failure of unknown cause], and every time the user brought the car to the dealer, the dealer had to replace all glow plugs.
Therefore, the manufacturer made a poor and cheap glow plug to reduce the loss and installed it in the late model 4M40.
I don’t know if it’s true…
If there is a reason to make such shit parts, I think we should have made a proper engine.
I question the decency of manufacturers who pretend not to know and assemble the worst parts.
The glow plugs on this car are the worst. They will last less than a year at the earliest. It’s surprising that the manufacturer proudly assembled such a part as a “genuine Mitsubishi part”.
I thought that normally there were no parts as reliable as genuine parts, and that the manufacturer would take care of any malfunctions or problems at an early stage, free of charge, but the glow plugs on the 4M40 were an exception.
Translated with www.DeepL.com/Translator (free version)
I mean, I don’t want to deal with it because I know it’s going to go bad soon.Or, a badly running engine is not a fault. So we don’t deal with it.
I guess that’s what you’re saying.
There are no good quality ceramic plugs available now (corrected 10/2/2017: there are now), so I got all four new plugs once (corrected 10/2/2017: there are now), but one died a year later and another one died the second year…
In two more years, all the glow plugs (metal plugs) I bought new were going to die, so I replaced them all with used ceramic plugs that I removed from my 4M40 with over 200,000 miles on it. Since then, the glow plugs did not cause any engine starting problems.
Where do you get a good quality glow plug?
I get mine from a demolition shop.
All the diesel engines in the world have been taken away by the dismantlers and engine buyers. So when you go to a demolition shop, you’ll find an L400 or 4M40.
But you should take a good look at the glow plug that comes with it. If it’s shiny, it’s a bad metal plug.
Ceramic plugs are rusted and dirty as much as possible. Don’t let looks deceive you. It’s those rust-stained glow plugs that run the engine properly.
What is a chop shop? Actually, I’m an engine guy.
A demolition shop is, in other words, an “engine shop”. So, “Give me a glow plug! But they won’t. This is because if the engine parts are not installed properly, the engine will not be sold.
So, I took my “brand-new faulty glow plug” and asked, “Would you let me replace it with this glow plug? If you ask them, they will think about it.
Of course, you may have to pay a little more for the exchange. Furthermore, you have to do the replacement work yourself. A disassembly company will not help you.
So, you should at least have the skills to remove the glow plug.