After searching most of the day for an actual AC Delco sensor I have given up. Apparently there are none left. I called several parts stores, dealerships, and online outlets. They all have the same thing. Bosch sensors in Delco boxes.
Since I can't find a Delco I have decided to try out a Walker. Pn# 250-22001. Price ~$20. Looks to be the same as what I'm seeing for Denso also FYI. Clearly very different from the Delco and Bosch sensors. I'm keeping fingers crossed that it at least works better then the Bosch do.
Right away the idle seems smoother. The scanner also showes much better movement then the Bosch ever did. It doesn't jump from extremely rich to extremely lean anymore. I'll post the rest of my findings in a few weeks once I've had some time to fully test it.
Thought I'd add a reference picture also...
Walker on left, Bosch in center, AC Delco on right. The only issue I see right off the bat is the location of the threads. The bung is recessed slighly into the 4.9 manifold. This makes it slightly more difficult to tighten both the Bosch and Walker sensors. Not a big deal but something I thought I'd mention.
[This message has been edited by Fieroseverywhere (edited 12-20-2010).]
). These are not different then any other Bosch sensor. Same part numbers, same everything. They are simply cheating customers by offering inferiors parts in their boxes. I've always used Delco parts, but after this that will not be happening again. I will not purchase from a company that cheats their customers.
