sorry but like a rock is
EGR off, look at seat inside, make sure it is fully closed. No carbon chucks allowed.
blow air thru it, then if sure it is sealed, then test spring for proper tension.
blowing air from exh. side to intake side of valve.
if spring seems strong and holding, the valve shut,
then put back on , make sure gasket is sealing .
and plug the input tube (temporarally ) to the main EGR diaphragm.
these steps insure it is sealing,
at start:
Canister (EVAP) is off
EGR is off .
PVC is tiny oriface and very small . (not major player in Air during start, unless someone drilled it out, seen that too)
remainder of air supplies during start:
IAC (major player) ( has 5mm hex key for adjustment on my 91)
Throttle plate butteryfly valve, is held open with the Dashpot fast idle diaphragm.
but it has a spring in it that opens the Idle with no vacuum !
mine is closed for hot and cold running.
but cranking, that's another story.!
see next post on cold start fresh air.
Its all about Air.
Happy Christmas eve to all , and CHEERS !
Last edited by jtgh : 12-24-2007 at 01:39 PM.
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