welcome back, and good luck with your car.
ok , the egr on that USA year, (not outside or has wrong ECU as many have)
uses these smog rule
the EGR is killed 2 ways, 1: idle switch closed, egr vsv dead and #2: the egr is ported vacuum at hose 27
this is normal
the main valve must not open until you accelerate, starting in about 1992 to 1994 (by ECU and cars VIN #)
the vsv will not open until rear tires are rolling, (vSS rules, veh, speed sensr)
what is important is the main valve is closed, at idle.
http://www.fixkick.com/sensors/8v-sensors.JPG
if the egr does open at idle, (bad ) it will misfire like crazy and even stall, in fact that is the stall tests seen here
seen here
http://www.fixkick.com/EGR-Gen1.html#Stall-test
hose 27 goes to ported vacuum, this port is dead at vacuum. due to complex TB internal porting, (both on 8v and 16v) same rule.
and mixing up hoses, is a bad deal here.
the egr is modulated with the mod valve , which used back pressure from the CAT to measure engine load. and flows EGR on LOAD. more load, more egr flow.
cheers,
ok , the egr on that USA year, (not outside or has wrong ECU as many have)
uses these smog rule
the EGR is killed 2 ways, 1: idle switch closed, egr vsv dead and #2: the egr is ported vacuum at hose 27
this is normal
the main valve must not open until you accelerate, starting in about 1992 to 1994 (by ECU and cars VIN #)
the vsv will not open until rear tires are rolling, (vSS rules, veh, speed sensr)
what is important is the main valve is closed, at idle.
http://www.fixkick.com/sensors/8v-sensors.JPG
if the egr does open at idle, (bad ) it will misfire like crazy and even stall, in fact that is the stall tests seen here
seen here
http://www.fixkick.com/EGR-Gen1.html#Stall-test
hose 27 goes to ported vacuum, this port is dead at vacuum. due to complex TB internal porting, (both on 8v and 16v) same rule.
and mixing up hoses, is a bad deal here.
the egr is modulated with the mod valve , which used back pressure from the CAT to measure engine load. and flows EGR on LOAD. more load, more egr flow.
cheers,
http://www.fixkick.com