New EGR = Worse fuel mileage?

[jwalth02]

I recently purchased an immaculately maintained 89 Chevy Suburban with.the TBI 350. Everything is almost perfect with the truck though on the drive home the service engine light came on. After a little research and a paper clip I got the code 32 (or was it 23) that states the mas air sensor did not see the egr move. So I looked at it and noticed a bolt was missing. I pulled it off and sure enough vacuum leak. Well I went to auto zone and purchased their replacement and installed it. Now on the drive from salt lake to rock springs I got roughly 17 mogul. Now with this new egr I only get about 11-14 depending on how much highway I'm on. Did I get a faulty egr? Because I am still under the impression that it helps on long drives and it has only hurt me. Thanks in Advance.

 

[Chuzz]

Not all EGR valves are calibrated correctly. Take that junk one you got from Autozone back, get a refund and go to a stealership and purchase a genuine AC/Delco for your vehicle. You get what you pay for.

 

[jwalth02]

That's what I was afraid of. Well thank you for your response.

 

[VanGo]

I would monitor my mileage a little longer. It's hard to imagine an EGR valve causing an 18-35% increase in fuel consumption.