my mates corsa 2ltr 16v c20xe has'nt been runnin properly , so we've stripped the engine down , found that the headgasket has kindof gone . but whilst we was taking the head off we noticed that on the passenger side of the fuel rail theres a black/silver box type thing , it has what looks like a breather pipe going to the bottom of the throttle bodie . problem is ive looked on a friends cav gsi and he has the same thing the box with a pipe goin to the throttle bodie , BUT , he also has another pipe coming out of this box which goes over the engine and looks to be going into the bulkhead . problem is my mate has'nt got this other pipe on his corsa , it is missing . So i was just wondering what it is and would that make the car run crap ?? cheers for any help .
not sure if thats what it is mate , i thought that was the thing on the side of the throttle bodie ?? this box also connects in to the loom , by just 2 wires i think and a connector ( nothing special )
thats what i thought it might be , i have the same kindof thing on my peugeot , but would that help in makin it run crap ?
he was driving the car the other night and the engine went into get home mode ??? whats sort of thing would do this ?
u couldnt drive the car over 45mph in 5th gear !!
Ok smarty pants, who ever reads the orignal question anyway
That box is also on my C20XE head by the looks of things, and on my C20LET if I remeber. I think its called a (according to EPC) "evaporation control valve". Its actually bolted to a bracket which is bolted to the back of the head and the inlet manifold. Is this the part you mean??
The evaporation control valve is part the reduced emissions system. It should be connected to an active charcoal canister that in turn should be connection to the inlet manifold.
This canister contains active charcoal or active carbon granules.
Most evaporation control systems reduce the emission of fuel vapour during the time the vehicle is idling in traffic, or parked in strong sunshine by absorbing the vapour fumes into the carbon canister.
Once the engine is at its normal operating temperature the stored hydrocarbons are released into the inlet manifold where they become part of the combustible Air/Fuel mixture.
The control for allowing the hydrocarbons to be released into the inlet manifold through a cut off valve (In this case the ECV) usually done electrically or by vacuum: the operating principal is the same for both, our example is from the electronic solenoid type.
The electronic solenoid is controlled by the Electronic Control Module (ECM) by switching the earth path to ground under specified conditions.
If it is not connected you may have an air leak to the inlet manifold through when the ECV should be. Loss of power and such like.
The evaporation control valve is part the reduced emissions system. It should be connected to an active charcoal canister that in turn should be connection to the inlet manifold.
We didnt connect this up on my mates c20xe in a corsa,but make sure the connection to the inlet manifold is blocked,if its open unmetered and unfiltered air will be getting in,which will cause the bad running.
If it is connected or allready blocked try cleaning out the idle control valve as theese always get bunged up and stick.
Dave
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