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?
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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.
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.
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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
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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/
Thanks, Brian.