Idle speed low

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mussa_kongola
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Sat Jul 08, 2017 10:47 am

I have a double cabin hilux 2008 5L engine. Recently i replaced the pressure plate, clutch plate and engine mountings. After that at idle speed the truck vibrates, and with ac on, the engine rpm is 400. If press the acceleration pedal to 600 rpm, vibration disappear. Can the idle speed be a problem? What caused it to drop? How can i fix?

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Mars
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Tue Jul 11, 2017 10:02 am

If the engine idle speed is too low such as 400 RPM you are likely to start feeling vibrations. Normally idle speed is between 600 and 800 rpm. There are many factors which can influence idle speed. Replacing a clutch and engine mountings are unlikely unless you damaged or bent a link on the accelerator cable when removing the gearbox/ old engine mounts.

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Mud Dog
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Tue Jul 11, 2017 1:33 pm

As Marnus said, clutch and mounting replacement should have no influence on the idle speed unless something else has been changed or damaged in the process. I don't know much about the 5L diesel motor but also have to wonder if there are any electrical components that control idle, mixture etc. in which case maybe a wire was damaged or disconnected. :think:

There must of course be a way of adjusting the idle speed in any event, so if you don't find anything that may have been affected during the replacement process, then perhaps just bring the idle up a bit that way.
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mussa_kongola
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Sun Jul 16, 2017 10:42 am

Everything is electrical, the accelerator has a solenoid that adjusts the air, also the diesel pump is electrical. My mechanic was suggesting to service the injector pump, to him he thinks it is not pumping enough fuel.

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Mud Dog
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Sun Jul 16, 2017 2:37 pm

I'm still thinking that something was disturbed / disconnected / damaged when the clutch and mounting work was done. Your problem started immediately after that.
When your road comes to an end ...... you need a HILUX!.

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Life is like a jar of Jalapeño peppers ... what you do today, might burn your ass tomorrow.
Don't take life too seriously ..... no-one gets out alive.
It's not about waiting for storms to pass. It's about learning to dance in the rain.
And be yourself ..... everyone else is taken!

Mars
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Mon Jul 17, 2017 7:04 am

I agree.

mussa_kongola
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Tue Oct 17, 2017 7:46 pm

Mars wrote:I agree.
The acceleration pedal had a rubber inside, where the spring seats. Had to change it and rpm at idle speed increased.

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Mars
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Wed Oct 18, 2017 11:23 am

Good to know thanks

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