Joined: May 2016

Posts: 120

Likes: 1

From: Rome, Italy

Car: Pontiac Firebird Formula

Engine: 3.1 LH0

Transmission: 700R4

Axle/Gears: Automatic

Hi guys, I found this thing around the EGR zone. The dark blue wire grounded to the
firewall?

Furthermore, I found this brown wire soldered to the pink/black one that goes to EGR connector. Can you tell me what kind of functions do that two wires? I just want to restore the original wiring messed up by the old owner...

It’s a 1990 Firebird, 3.1 Lh0

Thank you guys!

Joined: Dec 2004

Posts: 16,754

Likes: 996

From: Mile High Country !!!

Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Pink/blk is power to the ccp/ air and egr solenoid.
http://austinthirdgen.org/mkportal/m...ine_wiring.gif

Joined: Dec 2004

Posts: 16,754

Likes: 996

From: Mile High Country !!!

Car: 1967 Camaro, 91 z28

Engine: Lb9

Transmission: M20

Axle/Gears: J65 pbr on stock posi 10bolt

Dark blue might be the fan pressure switch. Does the fan run with the key on ?

Joined: May 2016

Posts: 120

Likes: 1

From: Rome, Italy

Car: Pontiac Firebird Formula

Engine: 3.1 LH0

Transmission: 700R4

Axle/Gears: Automatic

Thanks for your reply, the fan stays off with key on. The EGR seems always to be off too, in every condition, but I hear a clicking noise from it