Oct 22 2014, 11:38 AM
QUOTE(chrisstse @ Oct 22 2014, 09:20 AM)
Hi all Sifus here,
...
1. My car when first start fresh in the morning, when engine still cold, will have vibration which should be very normal since the last 3 years. What is not normal is how it vibrates recently. Instead of vibrating all the way, it vibrate a bit then almost die engine, then vibrate again. It is like the car behaves like people sucking not enough air and wanted to suck more air in (kind of like kena asthma), but when the engine enough hot (ie started for around 5 minutes) the special vibration is gone. I try to bring the car to mechanic to troubleshoot, but the special vibrating goes away already because the engine is hot, so the mechanic did not know what is the problem, start back also no use because engine hot already so no more special vibrate. To add in more description: Sometimes when I am in a hurry i will press the accelerator to heat my engine. When the accelerator was pressed with free gear and the special vibration is still there, the exhaust sound is like kentut, like got gas was released out before it went smooth, then the special vibration is gone.
...
One of the causes of this problem might be the autochoke malfunction....
1. My car when first start fresh in the morning, when engine still cold, will have vibration which should be very normal since the last 3 years. What is not normal is how it vibrates recently. Instead of vibrating all the way, it vibrate a bit then almost die engine, then vibrate again. It is like the car behaves like people sucking not enough air and wanted to suck more air in (kind of like kena asthma), but when the engine enough hot (ie started for around 5 minutes) the special vibration is gone. I try to bring the car to mechanic to troubleshoot, but the special vibrating goes away already because the engine is hot, so the mechanic did not know what is the problem, start back also no use because engine hot already so no more special vibrate. To add in more description: Sometimes when I am in a hurry i will press the accelerator to heat my engine. When the accelerator was pressed with free gear and the special vibration is still there, the exhaust sound is like kentut, like got gas was released out before it went smooth, then the special vibration is gone.
...
You can try to check as follows: look from the right side of your car,
under the air filter housing, you will see the autochoke. It is
operated by engine coolant and a fat spring. When cold the piston
is retracted and the spring opens the throttle a little bit. Inside
the piston are air bleeds that supply a richer mixture so the
engine is able to run properly when it is cold.
When hot, the piston protrudes out (as shown by the reference lines
in the picture) making the air bleed change to normal mixture and
closing the throttle back to normal.
Observe the position before starting the old engine, and then after
the engine is hot, and see if there is a difference.
When these function correctly, there is no vibration even when engine
is cold.
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