Quote:
Originally Posted by SoonerBred1963
The N62B44 has a two-stage oil pump. The first stage is used during start-up and once the oil is warmed up, this is deactivated and then second stage is activated to provide more pressure at low engine speeds. Pressure specs at the pump with room temperature 20*C oil are 1 BAR at idle and 4-8 BAR at full unladen engine speed (6500) . Why didn't your previous technicians thread an adapter with a hose to a gauge. At the oil pressure warning sensor port. This is common sense diagnostics.
Have not done that. I will ask him to, but just understand the Low Oil Pressure. warning did not come on until about 8 pm when he was packing up to leave.
Camshaft bank codes can be caused by stretched timing chains, a failed hydraulic tensioner or a damaged guide. Really need to be using INPA in the correct menus to determine what's going on, and to determine if the timing is indeed correct.
Second time someone has mentioned the timing chains being stretched. Sorry for my ignorance what is the INPA?
Third, all coils should be bench tested, along with plugs inspected.
He did test all the coils, and inspected all the plugs. Bench tested the coils.
Because the oil pan and sensor were removed/changed was the oil sensor reset procedure performed ? What about the ram_backup cleared, this has to be done once vanos solenoids are replaced.
I am pretty sure nothing was done to reset the oil sensor. What does one due, is that through the software, coding machine?
On the ram, I have cleared the codes from the scanner, but I don't know if that is same thing. Again, what would that procedure be?
When you say the engine is toast if the timing chains are stretched, can you not just replace the timing chains? And how would you know if they are stretched?
I appreciate your comments, maybe it will help me towards a resolution.
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The bigger question is
why aren't your two previous technicians working here in this thread to better learn how to perform diagnostics and the repairs that they made that did nothing to solve the issue or at least keep enough of a record for the next guy. BMW's are complex vehicles, and as they age passed 10 years dealer's no longer have techs that know how to work on them 'old stuff' and multiple compounding problems arise as the previous 5 owners allowed deferred maintenance to mushroom into a giant clusterfck. Did you even read the link to the blog I posted ? That's my work.
Just to make it clear you are going to end up with a few scenarios, so to save your time let's just get right to the point so you can move on with life and get your car on the road working great, and then we can manage expectations of what's realistic.
-check to determine if you had reached the mechanical totaling value of your vehicle, and end up by selling it for a loss, or keep pouring money replacing parts and diagnostic hours until something sticks
-hire a competent workshop to solve problems from beginning to end
-learn on your own, but this takes training, investment, time, tools, experience, and you have to be willing to make mistakes and potentially lose use of your vehicle for awhile while waiting for parts or finding out you don't have the tools needed.
I am pretty sure nothing was done to reset the oil sensor. What does one due, is that through the software, coding machine?
That's a question to call your previous technician and ask if they did it, and write it on work report. BTW, you should upload and post your invoices and technicians' notes performed from the last times it has been worked on.
On the ram, I have cleared the codes from the scanner, but I don't know if that is same thing. Again, what would that procedure be?
Clearing active codes is not the same as deleting the ram_backup
INPA is a special OEM software tool that can show if your timing is off, has a engine rough running menu, and comes with a couple utilities like tool32 which lets you execute special backdoor commands like reset the positions and force learning for the oil sensor, vanos solenoids, camshaft timing learning. THere's been a couple TSB's issued where replacing oil sensors without the correct reset procedure causes all sorts of misfiring and weird problems. That's why I even mentioned it in the first place, again a lot of backround details I'm not even getting into because it would require me to write a scholarly publication. If you want that, go to my blog.
Maybe it's time to take it to the 'car ninja'
https://gmwks.com/