HJ61 12ht Idle Pulse/Shake (1 Viewer)

[sxphj61]

Hi guys, new to the forum, here's a little background info: I inherited my grandfather's 60 series with a 12ht (auto) and 230,000km, always serviced every 10,000km at CMI Toyota since new. Nearly immaculate, always garaged and very well looked after.

Now I don't know much about diesels and have no reference point, so this could just be normal, but when the engine is warm and idling at the lights (in D) at around 650 rpm, the car shakes quite a bit and bounces you up and down a little.

Also while in P/N the idle is a little higher around 800 rpm and has quite a lumpy, pulsating idle (sounds awesome, but not sure if it's normal).

My dad and uncle have driven it every so often since new and have said that it has lost the power they remember, and up steep hills can't really do over 80kph - flats it'll do easy. Thought it was the turbo, but boost gauge says it's boosting at 7psi. It has 31.7'" tires (stock rims), so I thought the difference might be due to the diameter change.

Here is a video of the idle with the engine warmed up: Landcruiser 60 series 12ht idle pulse

Any help/advice would be greatly appreciated as this car means a lot me.

Thanks, Seb.

 

[georgebj60]

Not an expert here, and you might have better luck posting this in the diesel/24V section, but that engine sounds great to me.

Topping out at 80kph sounds a bit low, but really depends on how "steep" your steep hill is. If it's got adequate acceleration in general, I would not be too worried about it.

 

[sxphj61]

Good to hear! Has quite adequate acceleration with the upped 9.5psi. I also tightened the kickback cable to 5mm (was 3.5mm) which helped a lot as the transmission under light throttle would just hold revs and not kickback early enough.

 

[TDi]

Hi.
We dont have automatics so im not 100% sure how mutch you can tune this.
But try this when the engine is warm.
(See picture)
Start the car and leave shift on "P" position
Open the big red arrow screw like 2 full rounds, you can see idle dropping.
Now by little arrow tune idle ~700rpm and lock that screw.
And now tune big red arrow around 750-800 rpm.
Then try throttle it fast with you hand. See where throttle cable goes. Give it little gas, and see if its try to die. If it tries keep turning in that big arrow screw little.

If the idle is too hight, then turn the (little arrow) idle screw and start again playing with other...

Or go to the diesel shop and they can figured out.
It sounds nothing to worry just little tune.
Sorry my english, but i think you will get it.

 

[sxphj61]

Thanks for the reply TDi, I'll have a muck around with those settings

 

[Prairie Swamp]

What is the condition of the injectors and injection timing? Valve clearance? What does the 10K service interval include? I think you need to know where you are with the fundamentals before adjusting the injection pump. Sounds like it could be dirty injectors or injection timing.

 

[sxphj61]

Those are all things I really don't know. If it sounds like something is a bit off, then I'll have everything checked earlier than I was planning. Couple other things I noticed: there is a slight stutter at 1,500rpm on light throttle - just not very smooth. And on startup it only takes one turn of the starter motor, but the engine stumbles a couple of times (takes maybe 3 seconds) before it runs smoothly.

 

[GooSe77]

Hi.
We dont have automatics so im not 100% sure how mutch you can tune this.
But try this when the engine is warm.
(See picture)
Start the car and leave shift on "P" position
Open the big red arrow screw like 2 full rounds, you can see idle dropping.
Now by little arrow tune idle ~700rpm and lock that screw.
And now tune big red arrow around 750-800 rpm.
Then try throttle it fast with you hand. See where throttle cable goes. Give it little gas, and see if its try to die. If it tries keep turning in that big arrow screw little.

If the idle is too hight, then turn the (little arrow) idle screw and start again playing with other...

Or go to the diesel shop and they can figured out.
It sounds nothing to worry just little tune.
Sorry my english, but i think you will get it.

I also have this rev bouncing when launching in 1. gear without extro throtle .... I opend the big arrow, turned that screw in and out but only noticed verry litle change in the RPM ... is this suposed to have a big impact on RPM ?