EGR valve compatibility
Thread Starter
Joined: May 2012
Posts: 437
Likes: 115
From: Arcadia, OK
Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
EGR valve compatibility
Converting my LO3 5.0 TBI to TPI. I have TPI hardware from 89 TPI 5.0. I know the 89 still used the heat sensor, but my 90 will not (using 1990 speed density PROM in 7730 ECM). Question is: can I use the 1989 EGR valve or is there some other difference between the 89 and 90 EGR valve other than the wire?
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: EGR valve compatibility
I think they are the same other than the temp sensor.
just verify if it’s a positive or negative back pressure valve. There will be a p or n on the valve body.
just verify if it’s a positive or negative back pressure valve. There will be a p or n on the valve body.
Thread Starter
Joined: May 2012
Posts: 437
Likes: 115
From: Arcadia, OK
Car: 1990 Pontiac Firebird Formula
Engine: L31 350 TPI
Transmission: Tremec TKX
Axle/Gears: 3.23 Posi
Re: EGR valve compatibility
Thanks, the 89 EGR has an "N" on it. Will that work properly with the '90? I've read contradicting specs. Some call for P for 1990 LB9, some say N.
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: EGR valve compatibility
I’m really not sure, this delco one says positive for 90 and 89.
https://www.rockauto.com/en/catalog/...egr+valve,4968
https://www.rockauto.com/en/catalog/...egr+valve,4968
https://www.rockauto.com/en/catalog/...egr+valve,4968
https://www.rockauto.com/en/catalog/...egr+valve,4968
Last edited by Tuned Performance; Nov 8, 2018 at 05:32 PM.
Joined: Dec 2004
Posts: 16,740
Likes: 994
From: Mile High Country !!!
Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: EGR valve compatibility
I think I would be inclined to try the n egr valve
https://www.gm-trucks.com/forums/top...neg-egr-valve/
https://www.gm-trucks.com/forums/top...neg-egr-valve/
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