Diesel Idle Speed

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bad_religion_au

bad_religion_au

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anyone got any idea why my diesel's idle is slowly increasing. lately it feels like i still got my foot half way down on the accelerator pedal, and i haven't changed anything, so i don't know why it's changed... throttle cable is not sticking (had that problem once before but have checked it this time.
 
The Dude

The Dude

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I believe it is related to the leather diaphram on the back of the injection pump. It has a hole in it. Almost guarantee it.

About a $25 part (don't get it at Toyota) and an hour of your time. The smaller your hands the better cuz it is a little tight to get it off/on.
 
I

IironSika

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If the idle is almost OK when the engine is cold and increasing when it warms up, it`s almost certainly the diaphram that big_blue was talkin about.
 
s79bj40

s79bj40

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toyota is the only place which stocks them and they are about $45 for a new one. Dont even bother getting a second hand and they take only about 20mins to replace, and that only because its tricky getting your hand behind the back of the pump. I had my 4cyl at petrol consumpsion before i bothered and it was fully ripped to shreds when i took it out but boy the world of difference it made!

Sam
 
bad_religion_au

bad_religion_au

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yeah, just found that it was the diaphram, thanks guys. getting the part monday or tuesday/
 
cruiser_guy

cruiser_guy

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You should also drain the oil from the injection pump when you do an oil change. Some newer pumps have a one way valve to drain the oil, others have a small screw which needs to be manually removed to drain the oil. It's located about 1-2" from the bottom of the pump just forward of the diapragm.
I've been told that draining that oil is supposed to help extend diapragm life.
 

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