1KZ vs D4D

[bucket Junior Member Find all posts View Profile Close bucket]

I know I'm drawing a long bow here, but I'm still trying to convince my wife that a Prado would be good and she's starting to weaken. I have decided that a 120 series is the model for us for a number of reasons. Now here's the big question, I'm looking for longevity in a motor, so with all that's in this (and other) forums, what do readers recommend out fo the two diesel motors in the 120 series?

We have Prados at work and I like the D4D and six speed box, however we had one detonate a couple of years ago and Toyota replaced the short motor under warranty without ever defining what the cause was. The reason for replacement was that a piston had disintergrated and destroyed the bottom end. I have also heard of problems with injectors, not sure if this is the issue that caused the above.

I know that the 1KZ is an older and less powerful motor but can that mean longer life and cheaper maintenance? The lack of power could be taken care of with a chip. There are still some good early 120's getting around.

While extreme off road is not on the cards (not totally out of the question though), towing and outback touring with some mid range 4WD stuff would be the intended use. We have been using the Prado at work since the introduction of the 120 and now have an auto and manual 150, all motors have been driven and the 4L petrol is a great donk but a little on the thirsty side.

Any comments or help would be appreciated.

[Riv39 Advanced Member Find all posts View Profile Close Riv39]

Well potential problems with the D4D are well documented here on this forum. Have a read of this thread regarding the other motor as that might also help:

http://www.pradopoint.com/showthread...-diesel-engine

[Dueler120 Senior Member Find all posts View Profile Close Dueler120]

I think you will find that every motor/ car/ manufacturer have problems. There is no vehicle on the road that can say it has a perfect service record. Personally I have driven both engines and even tried a KZ and KD back to back the day I purchased my vehicle. The KD was newer with less k's and the difference in ponies was noticeable jumping between the two. We also run the D4D motors at work and these vehicles get the living hell beaten out of them. Either way nothing is bulletproof so the best thing we can all do is maintain services with Toyota recommended parts and fluids. What I have read is that injector issues with the D4D should be combated with a change over at 100,000km and in any case injector replacement should be a staple diet of any engine anyway to keep it ticking along nicely.

Good luck with the missus but you wont regret a 120 purchase which ever motor combo you choose.

[Whitey1 Advanced Member Find all posts View Profile Close Whitey1]

Yeah but you shouldn't have to change the injectors at 100000km, like a lot of us have had to. Not at $3000.

[wooley Avid PP Poster! Find all posts View Profile Close wooley]

Yeah but you shouldn't have to change the injectors at 100000km, like a lot of us have had to. Not at $3000.

That's relatively common practice in a lot of circles for diesel motors.

[Madkore Avid PP Poster! Find all posts View Profile Close Madkore]

Anyone know what an injector replacement cost for the 1KZ is?

[Dueler120 Senior Member Find all posts View Profile Close Dueler120]

Just got a quote for brand new genuine Denso injectors for $2992 inc GST for D4D motor.

[Anth120playdo Banned Find all posts View Profile Close Anth120playdo]

Anyone know what an injector replacement cost for the 1KZ is?

It will vary, kz are rebuildable but 3 figures not big 4 figures.
A few hundred ...... $500.......

[uk_vette Junior Member Find all posts View Profile Close uk_vette]

I have almost 400,000km on my 2005 D4-d (1KD-FTV) 2005 year.

Front passenger side rubber cv boot was replaced at about 16,000km

The alternator was replaced at about 350,000

Original batts, exhaust etc.


vette

[Whitey1 Advanced Member Find all posts View Profile Close Whitey1]

I have almost 400,000km on my 2005 D4-d (1KD-FTV) 2005 year.

Front passenger side rubber cv boot was replaced at about 16,000km

The alternator was replaced at about 350,000

Original batts, exhaust etc.


vette

I think you'll find the D4D didn't come out until 2007.?
Sorry, just noticed your from china. Probably got the D4D model before us in Aus

[uk_vette Junior Member Find all posts View Profile Close uk_vette]

I think you'll find the D4D didn't come out until 2007.?
Sorry, just noticed your from china. Probably got the D4D model before us in Aus

.
In China at the moment, yes.
However theD4-d came out in UK as long ago as 2000, in the previous 90 series.
The D4-d were fitted to the 120 series from the launch date, in early 2003.
I was told by several southern hemisphere Prado owners, it is because of the poor quality diesel you guys have.
It was the same in RSA.

Also as an "add on" in China, there are loads of 120 series, and 150 series, mostly 150 series though.
Very few 80 series, no 90 series, no 70 series, lots of 100 series, tons of 200 series.
Almost every thing here is petrol.

vette

[Riv39 Advanced Member Find all posts View Profile Close Riv39]

Deleted....

[bucket Junior Member Find all posts View Profile Close bucket]

Thanks for the replies guys, I have noticed no-one has said 'don't buy....' which means to me that the kz might be worth a closer look.
While I accept that any vehicle requires on-going maintenance, a set of $3000 injectors every 100,00 kms to me is unacceptable, the older system (or even a petrol) sounds to me like it would be more forgiving over a longer period than the D4D. Like I said I do like them and drive the D4Ds at work, they are a great motor, but we do only keep them for around 90,000 kms so long term I wasn't sure.

Again thanks a lot.

Bucket

[Whitey1 Advanced Member Find all posts View Profile Close Whitey1]

I think the real reason we didn't get the D4D until later was not because of the quality of fuel, but because Toyota had a lot of motors that no longer met Europes emission regs so they shipped them off to countries they could still sell them to.

[ROB83R Junior Member Find all posts View Profile Close ROB83R]

Thanks for the replies guys, I have noticed no-one has said 'don't buy....' which means to me that the kz might be worth a closer look.
While I accept that any vehicle requires on-going maintenance, a set of $3000 injectors every 100,00 kms to me is unacceptable, the older system (or even a petrol) sounds to me like it would be more forgiving over a longer period than the D4D. Like I said I do like them and drive the D4Ds at work, they are a great motor, but we do only keep them for around 90,000 kms so long term I wasn't sure.

Again thanks a lot.

Bucket

The D4D wins IMHO. You won't need to replace the injectors again if its done properly with the right parts and preventitive maintenence.
I'd rather replace a set of injectors and have ample power then have a fat slug and have to replace a head and water pump housing etc etc with 1KZ.