Well, FWIW - have not replaced MAP, in fact, haven't even bought it yet. CEL is off for 2 days now (almost) and truck is running perfectly.
So where do I turn next - should the evil return?
All connections are good/clear, EGR valve is new, that DPFE sensor doesn't exist per the Isuzu dealership, they don't know what I'm talking about and according to them Isuzu's don't have one. And, of course, that doesn't mean they know what they're talking about - but does anyone else know if the '97yr has the DPFE sensor and where can I find one.
I've looked all over the internet - they have them listed as parts for other vehicles, namely ford, but can't find a single one listed for Isuzu anywhere.
Are ANY other sensors related to this EGR valve insufficient flow; i.e temp sensor, idle air control, etc