The car is running perfectly, but that doesn't mean we've gotten full closure on the culprit responsible for everything that has happened. Obviously we had a problem with the EML light, which was eventually fixed by TPS sensors. But why would a rev-blip every 15 minutes take care of the problem over the course of nearly a full year, if it didn't have to do with voltage? And if it had to do with voltage, why didn't the issue resolve itself when we swapped alternator pulleys?
Perhaps we had problems with both. Or perhaps it was all solely due to the TPS and throttle actuator issues, because when asked about the low-voltage situation, VAC assured us they didn't have any customers with this issue.
I'm at the point that I'm curious enough to give it another whirl with the VAC pulley, now that I know the symptoms of what can come, and what to do in order to get the car back up and running again. Of course, the major part of my curiosity stems from gaining back some of the lost ponies from not having the pulley. We'll see toward the end of the project if I decide to run the VAC pulley on the street again. Until then, let's continue with other upgrades.
With the car running well for the past month or so, we’re back to business, ready to dyno test our new intake manifold. But since it’s been a while since the previous dyno test, we’ll need a new baseline, we'll start with new oil and oil filter from Bavarian Autosport, which sells Lubro Moly 10W-60 specifically for M cars.
To ensure no metal shavings float around the oiling system, we also got a magnetic oil drain plug from Bavarian Autosport to catch these potential shavings.
The only problem with the Bavarian Autosport drain plug is that the head is slightly larger than the stock one, making it hard to put a socket on it while the aluminum under panel is on. Without the under panel on there it’s easy to reach with a wrench of gear ratchet, but we’d like to avoid removing the under panel each time. So we ground down a small lip off of this section of the oil pan you see here—literally about a mm or so.
It did the trick so we can now keep the aluminum factory under panel on there while removing the Bavarian Autosport drain plug.
As we featured and tested in Part 1, we’re using Bavarian Autosport’s Lubro Moly Engine Flush and Engine Protect products to clean out the engine and give it as much anti-friction protection as possible.