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Originally Posted by 80stech
If the pins on the DME are corroded then so is the DME connector. It sounds like you are in over your head on this and it would probably be best to take it to reputable shop. Yes, they are for sure awesome vehicles on winter roads.
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Yeah, this is probably the next step. I'd take it to the dealer, but even they couldn't sort out my original code. They said "it doesn't make sense". Yeah, thanks.
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Canbus issues need to be sorted out with an oscilloscope and using process of elimination, disconnecting or determining other modules on the network or wiring issues that are causing faults. Could even be an issue where the connector sockets have been pushed with a technician's test leads, and when re installed the socket's don't provide enough clamping force to make an electrical connection to the pins in the DME.
The Me 9.2.2 control to these engine's also can develop issues over time, and when changing parts/servicing and there's some special tools and procedures required to get the vanos system recalibrated like deleting the ram_backup - which will just cause random misfires and the engine will never run right.
Third there's also common wear points involved with the intake valve lift system which when worn out will cause uneven cylinder filling / leakages leading to random misfires.
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At this point, I'm not even sure it's a CAN issue. The DME is just not there. I did, however, see one pin that seemed to have zero or little tension on it when I was feeding a wire in to knock out some corrosion. I'm going to try and unpin that socket and see if it looks like it could be messed up in some way.
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I would love to take that off your hands and then sell it back to you once it's been sorted - or if you're feeling up to it, drive it up to Canada, park it in my storage lot and I can do some repairs. The 4.8iS is an extremely quirky engine with a lot of potential compounding issues and requires some skill and special tools to sort it out. I actually see you have listed your location in North Carolina, I'm a big fan of your current state representative
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Dude, take it. Please. I'll ship it to you for free. I don't want it back if I'm selling it. I'm seriously missing my old 70s and 80s cars that, even when they broke, could be fixed easily. Engine rebuild? Fine. Give me a dirt parking lot and a few sockets.
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Your dad's denali is probably a gas engine, but just wait long enough for all the high-trim quirks and features to go out. If it's a diesel engine, those isuzu built V8's are extremely unreliable and have a number of design flaws not to mention to many wear points and difficult to service due to being shoe-horned inside the chassis. Compare the labor hours to replace a turbo on that vs a Ram 2500 with a inline 6  My daily is a Ram 3500 - the newer models with the 4/5 gen chassis have a lot more plastic parts that can wear/tear as well as a lot of quirks and features that can go wrong also but that's all been fixed since I'm a technician. Your audi didn't leave you stranded because it's probably not old enough for all these quirks and features to break down. You should have known what you were getting into when you bought a 15 year old top of the range BMW.
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The Denali is the 6.6L diesel. I don't care about the "quirks" of the thing. It just seems to work--
always *knocks on wood since it's now my only functioning vehicle*. It has scary electronics, maybe a questionable architecture (just had to replace the headlight bulbs...) but probably 1/3 of the BMW. And in the end, it has 70,000 miles and not a single thing has ever failed on it. Find me a post 2001 BMW that can say that. The Audi I owned was a 2004 Allroad 4.2. I never had the timing chain issue because I rebuilt it with the uprated guides. The air bags never deflated while I was using it and I replaced the compressor with an Arnott part. It never failed. It had TONS of random issues, but in the end, I never got stuck somewhere and it was surprisingly good in the snow/mud. Regardless, I
do know about mid-2000's Audi reliability, as well. Maybe I just got lucky.
I knew what I was getting into with this car. As mentioned, it's not my first mid-2000s German car. I just hate when something ridiculous such as the car literally NOT SEEING A MODULE PLUGGED IN is somehow my fault for buying it. Maybe, just maybe, this was just one of many engineering oversights or an over-complication. This is an issue that I
tried to fix as a dealer would have, by replacing the module. It just sucks that I purchased this turd knowing all the usual issues the N62 cars have, having gone through most of those, then finding some illogical unicorn of a problem that I can't fix on my daily driver.
Back on point: anybody know where I'd even be able to purchase a new plug for the DME if it has broken? The wiring looks very different between the N62 car and the rest of the E53 lineup.
By the way, here is a video of my Foxwell scanning the modules. It's long, but you can skip through and watch the DME show up, then go missing:
https://vimeo.com/694438503
This is the plug that seems to have a funky socket:
Supid BMW Plug by
Matt Bell, on Flickr