SOLVED - reduced power engine fault codes

[TriX5]

Washed and vacuumed it today, a year in a dusty place with no shopvac, ugh! We used it quite a lot including many trips to nearby beaches, the inside looked a bit grim. Still have to go through it with some leather cleaner.
My left rear alignment is off and the tire is looking thin on the inside, another item on the Todo list.
Tomorrow by chance I have a couple of guys coming to help with drywall and paint some crown molding, so the Diagnosis of the 35d will be on hold for another day

[TriX5]

With nothing done on the E70..... I cleared out the back of the garage to have the guys paint the ceiling and realized that I simply needed to use the building materials stacked everywhere to make more room for the cars. So, pulled out the drywall tools and a few buckets of compound and now a lot of drywall work is done in my garage and in the basement media room as well as a stairwell that was missing some work. Once I complete the ceiling paint in the front half of the garage, I can reorganize again and hopefully get the two X5s and the Tundra parked inside! :-)

But I digress, today I pulled the E70 inside and hooked up INPA. The two errors that appear immediately after clearing the EM are:
P0069 Manifold pressure and barometric pressure inconsistent with charge pressure sensor, and;
PP0237 Turbo charge pressure sensor circuit low. At the end of the error listing all the measured temps, etc., it suggests the sensor circuit is either short circuited to ground or interrupted. Oddly, it says the failure is not actual but is stored in memory, so this is intermittent I guess.

So, tomorrow I plan to have a look at the charge pressure sensor, I can swap it, as I still have the one I took off late 2018. I will also try to see where the vac lines are that seem to be getting old. (EDIT: This error seems to relate to the MAP sensor in the intake manifold. Can't swap it as I never changed it before. Thought about it at the time and didn't.... Ugh! )

In addition, while crossing France during January in a rather bad rain storm the car flashed up an EDC error which seems to be the RR (as opposed to my initial assessment of RF. INPA has a strange error where clicking RF connects to the RR and vice-versa, same for the left side). I am hoping it is simply a connection problem....

We have been watching some Tyler Hoovie videos and the wife is starting to mutter about BMW hoopties.... ;-)

[TriX5]

Yesterday cleaned the MAP sensor but no help. Wasn't expecting that it would help since INPA indicates a circuit fault but it was also slightly plugged which makes me curious about the state of the intake manifold. Ordered a new (OEM) sensor online, I guess should be available for pickup on Monday or Tuesday.

Didn't see any obvious leaks in the vacuum hoses but they do look a bit sorry. I don't really get why BMW placed the taps for the small vac lines under the intake manifold. Then runs a bunch of long lines all the way across the engine to the pressure converters. Looks like this could be done much simpler.....probably designed by a committee! :-) Another reason to extract the manifold and potentially clean it up a bit.

Also investigated the VDC problem. From rummaging around with INPA it seems the RR VDC satellite is talking to the ECU but not taking any current to the valves. I will have a bit of time to take the unit off the car and check for continuity in the lines but I fear that it is an internal problem and may have to find a replacement.

[TriX5]

This morning went to pick up some parts I had purchased online from a local BMW dealer, one of which was the new MAP sensor. (Manifold absolute pressure) Got home, plugged it in and cleared the codes. It started up like a charm and no more Engine Failure code! :-) Simplest fix yet on a BMW.....(for me at least). Popped in a new air filter and cleaned up the engine bay a bit.

This morning also ordered a set of replacement shocks for the rear AD units. In the next week or so I will install them and that should hopefully take care of the active suspension faults.

Also this morning put in an order for a set of intake manifold gaskets from FCP (they cost a fraction of the OEM ones:-). I plan to take the IM off to get proper access to the vac lines and maybe clean up the manifold whilst it is off. Depending on the condition of the swirl flaps I might get a delete kit and install it. I will also check what else lives under the IM that could be preventatively replaced.

I need to get a few more liters of engine oil as it is really time to change it. And then I hope to get a few miles out of the 35d before it goes up for sale later this summer.

[ard]

Consider replacing ANYTHING rubber or plastic if you have the IM off. Not on my X, but prior cars have shown a propensity for creating 'had to diagnose issues' when a crack leads to a vacuum leak.

[TriX5]

ARD - Good thought! Definitely doing that.

That space under the IM is hades, it is dark, dirty and occupied by a web of wires and hoses. I did not enjoy reaching in there when I exchanged my GPM while improvising in an underground garage in Portugal, even with gloves it was near impossible to keep things cleanish.

As to cleaning the intake manifold there seems no definitive method or medium to use. Options I found thus far:
Carb cleaner
Brake cleaner
Mineral spirit
Diesel soak, then purple degreaser.
Oven cleaner
High pressure blasting.
Bring to NAPA store.... (Costs seen are about $20-30, prob higher now)

Latter seems most attractive as the stuff that the M57 coughs out is black and nasty in most cases. I'd probably have to drive a ways out to find a reliable NAPA store as auto part stores near me are pitifully poorly staffed.....likely they'd lose it, break it or abscond with it....

Anyone who has tangled with this please let me know what worked?

[blue dragon]

Time to get ISTA D. Your troubleshooting will be so much more productive

[TriX5]

Hate to admit it but I do have ista-d and occasionally use it. I remember initiating a new battery with it but I don’t remember exactly how I did that. It is not very intuitive and I just struggle to use it . Probably should spend some quality time with it.

I learned how to use NCSexpert to do the coding but that took a great deal of reading and watching videos until the basics sunk in. Next brake flush I need to figure out how to activate the abs. A good incentive to learn more about ista I guess.