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My VZ Alloytech has a very rough idle,it is either idiling a bit low or there is some other problem.
I have just recently purcheased the car and on idle the car kind of trembles a little.Anyone with any ideas?
Regarding the rough idle....check the grade of oil you've got in your engine.
Handbook recommends 10W-30 engine oil .
I've used the heavier grade 15W-40 and it caused a vibration and slight shake at idle.
The lighter grade oil doesn't put as much load on motor (runs smoother and gives me about 0.3 litres/100k better fuel economy.
using an oil with a thicker grade than 10w-30 plays problems with vvt actuators
What is a vvt actuator?
mine shakes to shithouse when running on gas at idle. Im talking really bad.
On petrol you can barely feel it but it is still there.
I've taken it back to the gas place and they checked the whole system but couldn't find any problem with the gas system. The reason it shakes more on LPG is because gas is a much harder fuel to ignite so ignition problems show up a lot more. The gas guy seemed to think it would be spark plugs or coil pack....but i've had both replaced recently and the problem is still there!
Any ideas?