I was finally able to mess with it again yesterday after work. I had to take my truck to the dealership for an issue so I had downtime while I waited to pick it back up.
The cylinder deactivation has happened the last 3 times I’ve started and ran a scan. I’m still learning all of the capabilities of the VCDS, and in my ignorance I cleared all of the codes after I replaced the plugs and coils so unfortunately I can’t pull up the fuel trims. Yesterday I did, however, discover how to monitor the misfires per cylinder as you mentioned. At startup, right away 7 and 3 were misfiring. I think I may have had one misfire on 5. I only had it running for 30 seconds before I was uncomfortable letting it go any further. Cylinder 7 Had 170 + misfires and cylinder 3 was around 80 in that time frame.
As for the low pressure fuel regulation, I chalked that up as caused by the misfiring and cylinder deactivation. If I do manage to solve this issue with new injectors and that still occurs, I’ll tackle that next. There is no chance I’m moving it from where it’s parked unless it’s on a tow truck.
I assumed the secondary air injection was caused by running it with the intake off as you said. I’m not overly concerned with the remaining codes that were thrown until after I clear up the misfires. They don’t seem that severe in terms of repair, time, or money.
I bought a CTEK battery charger last year as I knew the car would be in storage for a few months. One of the best investments I’ve ever made. It basically repairs your old battery to brand new status and works on just about anything from quads, bikes, and tractors to heavy duty batteries used in large machinery.
When I have time next I’ll check the plugs as suggested. I know the oil level is good as I check it weekly. I didn’t realize at first how much oil this engine actually consumes (especially when driving spirited) so I’ve made a point to monitor it. As stated earlier, I cleared the codes so the long term fuel trim is gone. I did check the PCV hoses yesterday and they were both secure.
I’m convinced the injectors need replaced and a carbon clean needs done. My only conundrum is do I take this on myself with the help of a close friend or do I take it to a reputable shop? If I decide to do this I’m certain I can accomplish the feat, but the issue is time. I most likely won’t be able to get started on it for a few weeks and then we start to approach winter. I do hate the fact that I have to store it, but if you saw what the chemicals they put on the roads in the Pittsburgh area do to your vehicle you wouldn’t want to leave your house. The municipalities switched to a new chemical compound 3 years ago and its eaten my truck to pieces. If I decide to take it to a shop I have a few concerns. First, there aren’t many shops around the area capable of completing this task and the dealership is flat out not an option. I haven’t heard anything but bad regarding the local Audi dealerships. Second, once I’ve found a shop that has the know-how, I’m not convinced they’re going to do it as well/thoroughly as I would. The third is price, but I can’t necessarily make that call until I have a quote.
Thoughts?