AC Delco sells like 3 tiers of parts as well. From about the same quality as you would find from the local Autozone's Valucraft offerings up to the OEM part that was produced for your vehicle.
Thanks. Saved me a bunch of typing. I was going to mention both items.The problem with the AC Delco and most aftermarket EGR valves is in the vacuum fitting itself. The OEM valves have a tiny, metered orifice that slows the EGR opening, where the AC Delco and aftermarket units typically have a wide open vacuum port.
MAYBE this grizzled old Dealership Veteran actually knows something, maybe he crammed on a no-name EGR valve and used a "gasket" under it that totally disables EGR function. Or put a BB in the vacuum hose. Maybe he's got a PROM burner, and tuned EGR out of the program. I'm REALLY suspicious of this "secret" fix. OTOH, if the engine runs good, and doesn't set a code...seems like the "fix" was worth the cost in reduced aggravation, improved performance, and lack of mental-health therapy bills.
For the record, I've bought Genuine GM parts--still in the sealed box--DIRECTLY FROM THE LOCAL STEALERSHIP, that turned out to be bottom-feeder garbage.
Prime example is the outside mirror on my '92 Lumina. Original mirrors were in great condition until SWMBO knocked the driver's-side mirror on the side of the garage door opening. Original outside mirrors were Made In Canada (where the Luminas were assembled.)
Replacement Genuine GM mirror was Made In China, and the black-plastic body was dull lifeless grey in six months, while the years-old original passenger mirror was still glossy black.
"Genuine GM" and "OEM quality" are not necessarily OEM quality. Suppliers change, quality plummets like a paralyzed falcon.
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