project 4ktq problem found but unsure of fix...

[Matthew Kramer]

First, thanks to all who had suggestions and encouragment..
   
  It was suggested to that I try to see if the throttle plate for the CIS was stuck and this is actually close to what the issue is....   The throttle plate isn't exactly stuck but it is very stiff.  
   
  I pulled the intake boot off and the turbo inlet out of the way and tried to lift the plate by the center bolt using my small snap-on magnet  which is usually strong enough to lift large bolts and sockets, wrenches etc...   Well, the magnet actually had a difficult time staying on the bolt head and it took a couple of tries to actually get a good connection...    I'd say that it is probably a 2-3 lb pull to lift the plate from it's resting position.   The plate will move through it's entire range but it takes some effort to move it, more than the intake of the turbo can provide I am sure...
   
  If I wedge the plate up a little the engine will idle and rev up until it runs out of fuel and if I work the throttle plate and tb butterfly simultaneously the engine will rev up and run beautifully..  but if the plate falls to it's resting position the engine instantly dies...
   
  I don't recall that the throttle plate on my 83 CGT was ever that stiff and I am not sure that my 4kq is supposed to be that stiff.  I doubt that the old JT could ever have pulled a plate that stiff except at high rpm and full throttle....So I guess the question is... is the plate supposed to be that stiff,  is it fixable,  or do I need to replace it????
   
  I have the CIS head turned URQ style with a VW rabbit intake boot and a custom fab'd 3 inch intake tube from there to the turbo inlet...   I was thinking it was possibly a problem of too much air volume in the system but I had a difficult time lifting the plate by hand with my fingers on the center screw....
   
  Thanks for all the help
  Matt Kramer
  project 4kq  Hopefully getting very close to done...
   
   

			
---------------------------------
 Yahoo! Mail
 Use Photomail to share photos without annoying attachments.