Re: MrVnz' Corsa
Posted: Mon Nov 02, 2015 4:49 pm
Non smooth idle can be many things.
This engine has many vacuum pipes. A split in any of them will let unwanted air into the system and upset the fuel air mixture. However, from your description I would possibly suggest the Idle air control valve. It may just need to be cleaned out along with the throttle body, but without knowing the car I can't say for sure.
Bubbling liquid noises are not good. They mean you have air in your cooling system. You posted earlier showing your coolant expansion tank was empty. First question to ask is why? Have you got a leak? I presume you filled up the cooling system. It may now just have some air trapped in it if it was filled too fast. Let us hope that is all it is. These systems are self bleeding, so you should run the car at a fast idle, firstly with the cap off the expansion tank, then as it warms up close the expansion tank cap and keep running until the thermostat opens. Allow the car to cool. Coolant from the expansion tank should be drawn back into the system. When cool, top up the expansion tank. If bleeding the system gets rid of the bubbling noises for a while, but after some time they return then you are getting air into the system from somewhere.
The more worrying reason could be that you have a blown head gasket. Does your cooling system become over pressurised?
This engine has many vacuum pipes. A split in any of them will let unwanted air into the system and upset the fuel air mixture. However, from your description I would possibly suggest the Idle air control valve. It may just need to be cleaned out along with the throttle body, but without knowing the car I can't say for sure.
Bubbling liquid noises are not good. They mean you have air in your cooling system. You posted earlier showing your coolant expansion tank was empty. First question to ask is why? Have you got a leak? I presume you filled up the cooling system. It may now just have some air trapped in it if it was filled too fast. Let us hope that is all it is. These systems are self bleeding, so you should run the car at a fast idle, firstly with the cap off the expansion tank, then as it warms up close the expansion tank cap and keep running until the thermostat opens. Allow the car to cool. Coolant from the expansion tank should be drawn back into the system. When cool, top up the expansion tank. If bleeding the system gets rid of the bubbling noises for a while, but after some time they return then you are getting air into the system from somewhere.
The more worrying reason could be that you have a blown head gasket. Does your cooling system become over pressurised?