[T3] Is this my FI problem? Hose routing & oil breather - long waffle!

["Craig Webb" <craig_webb@ntlworld.com>]

<x-flowed>This problem has been driving me nuts, but I think I'm on the way to solving 
it.  can the FI experts on here confirm I'm going along the right lines:

Problem:  My new FI engine refuses to idle under 1200rpm.

This is a brand new engine, just broken in.  I've converted a carbed car to 
run FI (stock 1972 system- dual vac dizzi).  I've been all over the car and 
done the following:
Set valves up correctly
Set timing correctly.  Dizzi also retards and advances the correct amounts
Plugs ok and gapped
Re-done my intake runner gaskets with 2No fibre gaskets - as suggested on 
here a week ago
Checked the large runner hoses at throttle body - no leaks
New injector seals used
Checked out the throttle switch and set correctly
Checked resistances of temp switches - ok

Turning the idle screw makes no difference (will increase in revs if turned 
out, but bottoming out the screw will not reduce revs).  i thought my 
throttle butterfly might be leaking air, so I placed a plastic bag over the 
intake mouth, this made no difference to revs.  I've obviously got air 
leaking in from somewhere.  Going back to the obvious, I think the hose 
connection from the back of the throttle body is wrong (the flat plate part 
of the throttle body by the firewall - this has a curved pipe from it which 
goes under the throttle body).  I'd run the hose from this to the oil 
breather - as it should be (I think).  However, I'm still running the oil 
breather from the carbed car, which is just the simple affair with a single 
plastic cap.  Looking at tech books, i understand that the FI model for this 
year has some kind of check valve/regulator which restricts the air until a 
certain pressure is reached - also has two plastic caps.  I figure that my 
carbed one is just dumping air from the breather into the throttle body and 
keeping my revs up.  Am I on the right lines?  If I pinch off this hose, the 
engine dies.  If I can get hold of the right oil breather, I'll put it on; 
if not, shall I just cap the throttle body end and 'T' the breather pipe 
into the aux regulator - air filter line?

Any thoughts welcome

Craig Webb - UK
1972 Square


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