Hi once again
I need a pic of the engine bay between the head and the afm, i need to figure out how to connect the valve located there since i'm removing a LPG kit from my car. What is the valve for anyway?
Thanks for all the help.
Thema 16V turbo s2 pic request
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Angle grinder
Re: Thema 16V turbo s2 pic request
If the valve is mounted on top of the thermostat then its the auxiliary air bypass valve (choke), but I'm guessing that it can't be this as your car would be a pig to start and warm up from cold if this was not connected up.
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smokeme
Re: Thema 16V turbo s2 pic request
Actually it was, someone already sent me a pic. The tube had been connected without the valve using a restrictor of sorts. This was probably done because of the LPG installation.
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Angle grinder
Re: Thema 16V turbo s2 pic request
I'm not sure why an LPG conversion would want to remove the Auxiliary Bypass Valve. As you probably know, the purpose of this valve is to be open when the engine is cold which causes more air to flow into the engine when idling, thus acting like a "choke" would on a carburettor engine.
As the engine heats up the bypass valve closes and the air going into the engine is then solely controlled by the butterfly valve of the throttle (and the idle screw setting of course).
The opening and closing of the bypass valve is controlled by a thermocouple which is in turn controlled by a temperature sensor that screws into the Thermostat housing and connects to the ECU which controls the current that determines the closure rate of the valve. There are two temperature sensors on the thermostat housing and from memory the one for the Bypass Valve has a blue connector on it and it screws into the thermostat housing horizontally. Its something like a 22mm socket.
Before reconnecting the bypass valve I'd recommend that you remove it from the thermostat housing and squirt some WD40 into the chamber, give it a good shake and then pour out the WD40. You can check if the mechanism is working by putting the valve in the freezer. When you take it out you should see that the valve is open and as it heats up the opening will close. The amount that the valve opens is adjustable by the small bolt on the valve. the further out from the centre that the small bolt is moved the wider the valve opens and thus the longer it stays open for.
If the bypass valve was previously disconnected and replaced by a constrictor then I would suspect that someone was trying to compensate for an engine that stalled when it was needed to idle. If this is the case I'd first suggest adjusting the small bolt as described above and then try fitting a new temp sensor.
It is not advisable to run the engine with a constantly open Bypass valve as was effectively the case with the LPG conversion.
Best of Luck!!!
As the engine heats up the bypass valve closes and the air going into the engine is then solely controlled by the butterfly valve of the throttle (and the idle screw setting of course).
The opening and closing of the bypass valve is controlled by a thermocouple which is in turn controlled by a temperature sensor that screws into the Thermostat housing and connects to the ECU which controls the current that determines the closure rate of the valve. There are two temperature sensors on the thermostat housing and from memory the one for the Bypass Valve has a blue connector on it and it screws into the thermostat housing horizontally. Its something like a 22mm socket.
Before reconnecting the bypass valve I'd recommend that you remove it from the thermostat housing and squirt some WD40 into the chamber, give it a good shake and then pour out the WD40. You can check if the mechanism is working by putting the valve in the freezer. When you take it out you should see that the valve is open and as it heats up the opening will close. The amount that the valve opens is adjustable by the small bolt on the valve. the further out from the centre that the small bolt is moved the wider the valve opens and thus the longer it stays open for.
If the bypass valve was previously disconnected and replaced by a constrictor then I would suspect that someone was trying to compensate for an engine that stalled when it was needed to idle. If this is the case I'd first suggest adjusting the small bolt as described above and then try fitting a new temp sensor.
It is not advisable to run the engine with a constantly open Bypass valve as was effectively the case with the LPG conversion.
Best of Luck!!!