Just joined the forums after lurking but I had to post this to see if anyone else has come across this: I have a 2008 Yukon XL Denali with Z55 suspension. I just replaced my entire suspension with OEM AC Delco parts (struts and shocks, mainly). Rode and drove awesome up until last week in which my suspension went back to feeling stiff as hell. I unplugged the top sensors mounted on the front struts and the connectors on top of the rear shocks. Drove for a few miles, didn't get any notifications on the dash about "Service Suspension" and the truck rode much better and softer, though there seemed to be more body roll. In other words, it was driving nice and smooth like before. Just for ***** and giggles, I pulled out #2 fuse in the underhood fuse panel (ALC), and when I turn the key on I immediately get a "Service Suspension" in the DIC. Compressor is new, works fine, already tested/diag'd it, etc. I know it's sending something to the struts because of the immediate ride quality change.
Now here's the one thing that made me think back to when this seemed to have started: I recently took my intake manifold and injectors out. I unplugged the battery for quite some time, a few hours if I recall correctly. My question is that is it possible the electronic suspension control module went to some default mode? Maybe some experienced GM guys can chime in here. I don't have a Tech2, however I'm in the process of getting a VXDiag and plan on running a Tech2Win on it. In the meantime, is there some sort of reset to get this back or am I stuck having to get an ALC calibration of some sort? (I read up on Joseph Garcia's build and it was very informative, though I think he went through more hoops than I did)
Now here's the one thing that made me think back to when this seemed to have started: I recently took my intake manifold and injectors out. I unplugged the battery for quite some time, a few hours if I recall correctly. My question is that is it possible the electronic suspension control module went to some default mode? Maybe some experienced GM guys can chime in here. I don't have a Tech2, however I'm in the process of getting a VXDiag and plan on running a Tech2Win on it. In the meantime, is there some sort of reset to get this back or am I stuck having to get an ALC calibration of some sort? (I read up on Joseph Garcia's build and it was very informative, though I think he went through more hoops than I did)