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I found myself here a number of years ago. Not with a coach but a stupendously desirable product form a certain Italian manufacturer of automobiles. Their warranty/service experts were no better.
For whatever reason; they chose to control one 12 cylinder engine with two ECU's...one for each bank of six. So, it was basically two inline 6 bangers on a common crankshaft. I still, to this day, have serious questions as to why.
Anyway, the left bank(engine) always ran perfectly...after the ecu's booted up and ran through the active aero drivel. But, the right bank was flaky. It would often start up a good twenty seconds after lefty. Mind you , there was no shaking or coughing. Just a different sound and the smell of raw fuel shooting out the right exhaust pipe. It was getting no ignition spark. While the cat was cool; this was not a serious danger. But, it would do the same dance whilst driving. You can easily do the math on that. Thickly accented service masters who "knew" the product inside and out were stumped and tried every way imaginable to blame it on me. Their ineptness would never be acknowledged and there were legal proceedings. I did OK because all of my repairs were technically not on the engine that failed.
In the (post warranty) years before ultimate demise; I took on the issue myself after giving up on any real help. The process was crude but mostly effective. Each time the fault appeared; I assembled six of my favorite brewed beverage and one high quality Fluke meter. Every wire coming out of the right Motronic was tested for continuity...across the entire run. The wire jackets were made of what I figure to be something similar to bat guano. The fault could be chaffing anywhere along a wire. I'd usually find it by or during consumption of #4. If not, operations were suspended and the remaining two would be consumed in a rage to be revisited the next day.
Short story; the beautiful but shoddy machine ended up burning to the ground. There was no reasonable way to ultimately catch and subdue the beast. The otherwise reliable left bank caught the bug at a track day event. I noticed the issue immediately and shut down but there was too much heat and obviously enough raw fuel to create an epic flame torch out the back. There have, throughout history, not been enough fire extinguishers produced to tame the event.
I'm aware that this diatribe doesn't speak directly to the issue at hand. But, I'm kinda venting amongst friends and pointing out that the issue with which you are faced is probably something extremely simple, probably well hidden, and might just have severe consequences if not remedied. While the warranty period is ongoing; take every opportunity to hold accountable the parties in play. Both manufacturers involved here have infinitely better practices than those of the one I had the pleasure of dealing with.
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Sam
2004 Country Coach Magna Chalet/ Cat C15
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Verona dies while driving
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