12HT feul pump proper calibration setting required

The other thing that causes lumpy idle is too low idle speed setting. Increase it to 750rpm and see what happens

These engines are always very touchy low down. Unless its undrivable, just get used to it
Tim

I need calibration setting . I was able to to locate engine manual of 12HT from http://www.peoplehelp.com.au/landcruiser/manuals/Engine_manual_2H_12HT.pdf but couldnt understand where to look for it

Whats FSM?

Naveed,

I always try to be helpful to you. So that is why I wrote
"The proper calibration settings are available in the factory service manual. If you have mislaid the link to the FSM..." in my first reply to you.

I wrote out Factory Service Manual, I accept I did not put these in Capital Letters, then I wrote FSM. FSM = Factory Service Manual.

Yes, you have downloaded the correct manual from my site. I spent considerable time taking the manual I found elsewhere on the internet and running it through Adobe software so that search functions work on this document. A search using your PDF (Portable Document Format) reader would have found reference to the Fuel System. In fact, if you go to the document index and click on the heading Fuel System, it will take you right there. From there you will see the Fuel System index and locate the instruction to do with the Injection Pump. They are on page FU29

Naveed, this is the Factory Service Manual. It contains all the information a competent repair shop needs to get your pump running correctly.

I SERIOUSLY AND SIGNIFICANTLY URGE YOU to NOT let anyone tinker with the insides of your injection pump. These pumps are renowned to last a very very very long time without tinkering inside them. There are four adjustments on the outside that you can play with if you are really confident and can return the settings to standard should you wish.

The first, and I suspect what your problem is, is the idle speed adjustment. This is a simple adjustment near where the accelerator cable joins the injection pump. I think your lumpy idle is from the idle speed being too low.

If you increase your idle speed to over the factory standard setting and you still have a very lumpy idle, then someone has stuffed up your governor settings. A competent injection pump shop with a proper test equipment will be able to reset the pump when it is OFF the vehicle. If there is no competent injection shop in your region, you will need to find someone in your own country or post it to a place in Australia for recalibrating.

There is also an adjustment in the same area that controls the idle speed when your air conditioner is turned on, or when the vehicle is cold. Simple adjustments.

The other two adjustments are your maximum fuel setting, and your off boost fuel setting which controls the fuel as you initially accelerate. I am not going to go into this here, but have covered it at www.peoplehelp.com.au/landcruiser.

Most of the time NONE of these things need touching. If you have tinkered, well.... it's going to be hard to help you.

I've also suggested that the level of technical expertise in this forum is sadly pretty limited and you are better off at I8HMUD.com or http://www.outerlimits4x4.com forums for tech support.

I trust this is useful feedback.

Tim

Tim

Many thanks for detailed advice.

I will ask the pump shop to use manual for setting the four adjustments on the outside of the pump.

Would you please let me know what is the factory setting for idle speed adjustment with and without AC for 12HT.

Naveed

Tim

Just realized the pump shop guy cant read english and I will arrange its translation for him and wanted to know which page provides the setting of the four adjustments outside the pump.

Many thanks in advance

As per my previous reply it starts at FU29

Any mechanic should be able to find and adjust the idle speed adjustment at the end of the accelerator cable. The air cond idle up adjustment is there too. Correct idle is 750rpm I believe.

The on and off boost fuel adjustments are not needed unless there is black smoke under power, or when first accelerating. There is always a puff of smoke at engine start up.

Tim