03-23-2021, 01:48 AM
hot idle fails. or cold way too low,or stalls. IAC can fail mostly for stuck open but can also stick closed,(rare)
pinching hoses vac. to find air leaks.(vac leaks)
unplug ISC wires, (tricky before 1991) on hot engine stalls said engine.
screw in the bleed CW(see if rpm changes )
unscrew the throttle stop screw, or use a feeler gauge on the TV to TB bore juncture, 0.0005" 0.0127 Millimeters .is PAR.1991+
all vsv not stuck open.
EGR base gasket not missing or cracked, EGR casing not cracked, rare but seen it .
all diaphragm's not leaking air(cracked inside)
all intake gaskets good, TB and manifold
if all normal air paths are blocked engine stalls and can not run or idle ever. can only run if right foot planted throttle pedal. like this. cam not idle lacking air.
that IAC in hot pan of water, blow in the IAC air hole to see that it is closed, but make sure bleed is closed first and mid TB gasket not missing or cracked at the inside bleed port .
pinching hoses vac. to find air leaks.(vac leaks)
unplug ISC wires, (tricky before 1991) on hot engine stalls said engine.
screw in the bleed CW(see if rpm changes )
unscrew the throttle stop screw, or use a feeler gauge on the TV to TB bore juncture, 0.0005" 0.0127 Millimeters .is PAR.1991+
all vsv not stuck open.
EGR base gasket not missing or cracked, EGR casing not cracked, rare but seen it .
all diaphragm's not leaking air(cracked inside)
all intake gaskets good, TB and manifold
if all normal air paths are blocked engine stalls and can not run or idle ever. can only run if right foot planted throttle pedal. like this. cam not idle lacking air.
that IAC in hot pan of water, blow in the IAC air hole to see that it is closed, but make sure bleed is closed first and mid TB gasket not missing or cracked at the inside bleed port .
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