Need simple EGR answer
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Need simple EGR answer
Pleas don't refer me to EGR articles because I have read them all and I am more confused then ever with the different types and their operation
Can someone just tell me if I should have vacuum on my EGR valve at idle and does if matter if engine is cold or warm
1989 with auto trans, all stock
Thanks in advance
Totally confused
Mike
Can someone just tell me if I should have vacuum on my EGR valve at idle and does if matter if engine is cold or warm
1989 with auto trans, all stock
Thanks in advance
Totally confused
Mike
Melting Slicks
Joined: Jun 2013
Posts: 3,065
Likes: 39
You should have vacuum at the EGR solenoid at all times except when the engine is not producing vacuum. During an EGR cycle, the EGR solenoid will open allowing the vacuum to pass through it and go to the EGR valve. This will manipulate the diaphragm within the valve and allow the exhaust gases to be recirculated.
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
Yes, but does the EGR valve itself need vacuum on it to hold it shut off such as at idle or does it need vacuum to hold it open allowing exhaust gasses to flow like when crusing. I can't test it until I understand that question
Sorry to be pain in the Butt
Sorry to be pain in the Butt
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
The ECM controls the EGR solenoid and only turns on the EGR valve when you are "cruising down the road".
