EGR...help
Member
Joined: Jul 1999
Posts: 269
Likes: 0
From: SE, NY, USA
Car: 1988 Vette; 1988 IROC Z-28
Engine: 350cid; 305cid
Transmission: 700R/4; 700R/4
Axle/Gears: 2.59; 2.77
No problem, we all were new to it at some time, and some of us (like me) still learning.
The Exhaust Gas Recirculation (EGR) valve (part of the EGR circuit) is a device that is threaded into the top the intake base and is used to cycle some exhaust gas back through the intake manifold under certain engine conditions.
The purpose is to reduce emissions during steady driving; a side effect is to lower combustion chamber temps which reduces the tendency to ping. It doesn't effect performance at WOT since it is not enerjized under that condition.
The circuit consists of the ECM, the EGR valve, an EGR vacuum solenoid, and the EGR temperature switch.
The ECM activates the EGR valve by energizing the EGR solenoid. The EGR temp. sw closes after the EGR valve opens and hot exhaust gases reach it. The ECM throws a code if the EGR temp sw is closed when no EGR is called for and if the EGR temp sw is NOT closed when EGR IS called for.
Now, aren't you sorry you asked.
The Exhaust Gas Recirculation (EGR) valve (part of the EGR circuit) is a device that is threaded into the top the intake base and is used to cycle some exhaust gas back through the intake manifold under certain engine conditions.
The purpose is to reduce emissions during steady driving; a side effect is to lower combustion chamber temps which reduces the tendency to ping. It doesn't effect performance at WOT since it is not enerjized under that condition.
The circuit consists of the ECM, the EGR valve, an EGR vacuum solenoid, and the EGR temperature switch.
The ECM activates the EGR valve by energizing the EGR solenoid. The EGR temp. sw closes after the EGR valve opens and hot exhaust gases reach it. The ECM throws a code if the EGR temp sw is closed when no EGR is called for and if the EGR temp sw is NOT closed when EGR IS called for.
Now, aren't you sorry you asked.