EGR lines

[justin0469]

I just installed my GM MAF and now am gettin a CEL for EGR flow. I have been told that I probably knocked loose some EGR lines but I can't find anything loose or missing. Can anyone provide a pic of where I need to be looking or any help?

 

[donmagicjuan]

There are vacuum lines that run from the "A" and "E" ports on the throttle body to the EGR system components. There is also an electrical connector for the EGR solenoid, which, if disconnected, will result in the CEL you have. The solenoid is located on the firewall, directly behind the D/P sensor on the intake manifold, and it has vacuum lines running to and from it.

I don't have any pictures at the moment, but if you have a Haynes manual there is a system diagram in Chapter 6 that might be helpful.

 

[justin0469]

The emissions relays at the top of the firewall has never been connected without a CEL. I have a 90 TB, are the lines still labeled A and E?

 

[donmagicjuan]

That definitely changes things. The 90 throttle bodies only have two vacuum ports, and I'm not very familiar with them. It sounds like you'll need help from someone that knows more about them. Sorry.

 

[justin0469]

The emissions relays at the top of the firewall has never been connected without a CEL.

I should say, the vacuum lines were never connected, but the relays have always been plugged in.