So my idle is at a perfect 800 rpm when I start my T2 until I drive for a while. it gets as high as 2300 rpm once warmed up.

I have block off plates and no coolant flowing through my throatle body. If my thermo wax is extending and opening my throlte plates shouldn't my idle go lower? And how is the thermo wax even working without coolant?

Also I am running 750 cc injectors all the way around and rtek 1.8 but this has been a on going problem before the install. (I need to update signature )

 

The extension closes the plates rather than opening them.

 

So should I just remove the thermo wax all together?

 

If the unit has no coolant running to it then the only way it could extend is from the heat of the engine itself. Chances are your problem is related to another issue. A sticky throttle cable could be the cause or a cruise control cable or a sticky AFM door or perhaps a shift in the timing or a misbehaving BAC/Air Bypass and so on. When the idle is high try closing the primary throttle plates by pressing upwards on the throttle linkage in front of the engine.

 

Its extending from the engine heat for sure. Happens everytime I drive it for a little bit and it sits in the engine heat. Or if I drive it for extended periods of time.

If I'm happy with the idle when I start the car immediately should I just remove it?

 

You could remove it but it was introduced in the first place to allow the engine to slowly lower the idle after a cold start thus it has its purpose. Secondly, the extension of the piston closes the throttle plates which lowers the idle speed as opposed to increasing it. Your high idle after driving is a function of something else.

 

Good morning high idlers...

I have been having this issue for sometime now and it would appear that Sach understands whats happening...

-The car idles at 2000 for 20 or more minutes after startup.

-for that 20 minutes the thermowax never extends and is never in contact with the roller cam.

-When I push up on the throttle linkage as Sach suggested the idle does drop(is this the sign that it is, in fact, the thermowax?)

It is somewhat confusing to me that the thermowax extending is actually slowing the idle instead of increasing it. When observing the thermowax it looks like the rod would extend, pushing the cam roller in the same direction as pushing on the gas pedal thus increasing rpm. Would it be possible for you to explain how the thermowax and roller cams work together in order to increase/drop the idle.

Is my thermowax the problem here or another adjustment that I have messed with somewhere on the TB previously?

Is it possible to replace the thermowax without removing the throttlebody?

Also, In what order should the following be addressed?...

-High Idle/thermowax
-running too rich
-adjusting TPS
-Setting idle speed
-timing

Thanks in advance for any helpful info and have a great weekend!!!!!!!!!!

 

The reasoning for it is pressing upwards on the throttle linkage at the front of the throttle body is the very same thing as pressing downward on the throttle linkage located at the rear of the throttle body. So, they move in opposite direction of each other to attain the very same result.

If the thermowax never extends then either it is not receiving the coolant as the coolant warming up w/the engine temperature activates the thermowax or the thermowax is clogged or the unit is just not working properly anymore.

If you remove the coolant hose supplying the unit you will see if the thermowax is clogged or the hose is gunked up with sediment. With proper effort it can be cleaned.

 

Thanks for your quick reply, Sach.

It would appear that the coolant passages should be the first thing for me to address as the coolant in my radiator is full of brown sludge.

I will flush the system and make sure the thermowax coolant passages are free and clear and report back the results shortly.

 

Remember to pull the hose which feeds coolant to the thermowax to peer inside and see if the obstruction is at that point in the system.