Well i just noticed when i rev the engine the double throtle actuater is not working and i suspect the vacuam pipe to be leaking any idea what sort of problems this might be causing ?

 

time for some block off plates yo!

 

The double throttle is designed to keep your engine safe while cold. It acts to restrict acceleration until the car is fully warmed up. There are two vacuum nipples on the throttle body that connect to the double throttle solenoid. One on the front, and one on the back. I suggest that you cap both nipples. This will eliminate any vacuum leak, and keep the plates fully opened. You will need to be careful to NOT accelerate hard until your car is fully warmed up.

 

I have verified with a boost gauge that the double throttle ONLY works when the car is cold - after it warms up a bit, the DT stays open at all conditions.

BTW, I believe it opens around 50 deg. C water temp if memory serves.

Dale

 

if anyone has an undamaged DT assembly...I'd like to buy it.

 

this was a very informative thread, thanks.

 

Umm... you can't buy a "DT assembly". You can buy a UIM with the DT still in it. Or are you actually looking to buy the DT plates/rod/spring? And if so, WHY?

 

I want to buy the actuater/rod/butterflies/screws...

why...because my car doesn't have it and I want it.

 

I can't imagine being able to get those screws out unscathed. I am helping a friend convert to single turbo, and to remove the DT I had to drill those screws out.

 

I was able to get the screws out...but they got lost (this was also I low milage 95) in the years.

if you have everything else undamaged, I'll take it.

 

I would be VERY careful re-installing them. The factory mushrooms the back sides of the screws that hold the plates in to insure the screws don't back out. If one of those screws vibrates out, you can kiss your motor goodbye.

Clean upper intake manifolds with the DT still intact are a dime a dozen, or you can get a JDM upper intake manifold that doesn't have the AWS stuff on it at all for an upgrade. While the DT could be re-installed, I'd be worried about a screw coming loose, even with Loctite and all that goodness.

Dale

 

well i checked it at cold i will heat up the car tommorow and check if it works. Now a days trying to setup the tps without having a metter to check the voltage and hoping to get lucky soon with it

 

ok acording to the factory manual the double throtle actuater is supposed to pul the actuater arm at startup and return at engine warmup my actuater is not pulling the arm at start up so is the double throtle open or closed ?? i have traced the leak to the presure chamber will fix it on monday till then want a temp soution should the arm be pulled in or extended for drivng ??

 

my idle was fixed by the tps but i still have hesitation in the 6k rev band while driving in second gear and above. i know it is due to the tps also but dont have a meter to fix it so trying differant positions every now and then

 

That means your DT is open and not functioning. Either a vacuum hose is disconnected, or the solenoid is bad, because it is a VERY simple system, not much can go wrong. With it not functioning, that means it is open all the time and not hurting anything, but it is also not protecting the engine on cold starts, so stay off the throttle during warmup until you fix it.

 

why would you want it back in your car??