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05-19-2018, 07:47 PM | #23 | |
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Mine would log out at around 1,000 mpa when stopped. 1,000 mpa being the pressure at sea level. Values would drop when the engine is running and you had a vacuum in the intake manifold. |
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05-20-2018, 08:04 AM | #24 |
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Do you have an N51/52? RealOEM shows it as a differential pressure sensor rather than a MAP sensor. That sensor shows the differential between the pressure in the intake manifold vs ambient. I would expect 0 with the engine off since the manifold would be at ambient pressure. With the engine running and throttle open, I would expect a small value and with throttle closed I would expect a large value, correlated with RPM. There is not much info online about this sensor in this engine.
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05-20-2018, 11:21 AM | #25 | |
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Did you cross check the part numbers? MAP sensor is the same N51 and N52 plus many others. |
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05-20-2018, 02:31 PM | #26 | |
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http://www.realoem.com/bmw/enUS/part...&q=13628617097 INPA shows "saugrohrdruck" as 0 with engine off. At idle it is 4-5. If I stab the throttle, it drops to zero, then increases to 8 and backs down to 4-5 again as the RPMs drop. This behavior is correct for a differential sensor (basically a manifold vacuum sensor). However, the green range in INPA is 0 to 255 so my readings are at the extreme low end of the scale, which might point to a vacuum leak. But the car runs perfectly with adaptations reset so I'd think it is not a vacuum leak or other mechanical problem. |
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05-20-2018, 07:46 PM | #28 |
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I didn’t, my values seemed close to Desertman and unless he secretly has a car that runs like a turd too, figured my sensor wasn’t toast. I’ve replaced the ESS and MAF so far, and MAP is cheaper than O2 sensors so I guess I’ll try MAP next. Really wanted to diagnose the issue before throwing parts at the car until one of them fixes my issue but at this point I’ve spent enough time grasping straws in the garage staring at Google Translate. Looks like only Genuine on FCPEuro at $85... their site actually says my sensor shouldn’t fit my car but oh well.
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05-20-2018, 08:30 PM | #29 |
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Don't know if this was mentioned, but normal O2 sensors operate between 0-1V, but our primary O2s are wideband, not sure where those operate.
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05-20-2018, 09:56 PM | #30 | |
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rowsdower I don't have very much to offer in this area, but I wish you luck in finding a solution that's easy-ish...
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(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread |
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05-23-2018, 07:13 PM | #31 | |
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06-07-2018, 01:29 PM | #32 |
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Not making much progress with BPC.
I did stumble upon a thread pointing a bad ccv valve. I'm getting suction under the oil filler cap at idle, and removing the cap seems to affect the idle. Check out the video I took. It's difficult to tell if this is normal from what I'm reading in other threads. Thoughts? |
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01-04-2019, 03:54 PM | #33 |
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Revisiting this issue again... I started getting secondary air pump codes but only for bank 2, which pointed to a failed O2 sensor there. I replaced both banks' pre-cat sensors, which cleared the secondary air codes but not the idle stumble.
I'm now trying to get my car through inspection and I'm not achieving readiness for fuel tank ventilation on the stock tune. I followed the procedure detailed in this thread to a T. It says to idle "in gear" for 5 minutes. I idled around a parking lot in first gear for 6 minutes, then tried holding the clutch to the floor for 6 minutes with the transmission in 1st, then tried idling in neutral for 6 minutes. No dice. I've never gotten a code for anything related to the fuel system. Any thoughts on what might cause the system to not be ready but also not throw any codes? I did stumble upon this thread and the embedded video is exactly what I'm experiencing with my idle stumble. So I'm hoping that whatever is causing my fuel vent readiness problem is also causing my idle problem. I'd rather look into this a bit more before dropping yet another $100 in parts to replace the valve without first confirming it's the problem. |
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01-06-2019, 05:24 AM | #34 | |
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Show- F10 550i M sport 8AT Alpine White: Airrex Bags, 20" Forgestar F14s, Meisterschaft Catback Around town- E60 528i N52, 6AT, Monaco Blue Weekend - 1997 BMW Z3 M52, 5spd, Dunkelgrun: 230k mi, Intrax Springs on Bilsteins, Style 68s staggered AutoX/track - 2012 F30 N20, 6MT BSM Last edited by smeard; 01-06-2019 at 05:33 AM.. |
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01-07-2019, 07:34 AM | #35 | |
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01-08-2019, 05:15 PM | #36 |
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Well after driving it for a few days, and experimenting with different idle times, it finally achieved readiness for fuel ventilation. I don't know specifically what finally caused it to get ready. I let it idle in my driveway for 30 minutes the other day and it didn't work. Drove it a few times normally and not exceeding 3k RPM but none of that worked. Today I drove it around town running errands and when I came back it was ready.
The fuel vent valve is in the mail already so I'll still change that out this weekend. If it fixes my idle I'll update here. |
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01-11-2019, 01:05 PM | #37 | |
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Commuter- F10 528i N20 8AT Jatoba Black
Show- F10 550i M sport 8AT Alpine White: Airrex Bags, 20" Forgestar F14s, Meisterschaft Catback Around town- E60 528i N52, 6AT, Monaco Blue Weekend - 1997 BMW Z3 M52, 5spd, Dunkelgrun: 230k mi, Intrax Springs on Bilsteins, Style 68s staggered AutoX/track - 2012 F30 N20, 6MT BSM |
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01-11-2019, 03:28 PM | #39 | |
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Commuter- F10 528i N20 8AT Jatoba Black
Show- F10 550i M sport 8AT Alpine White: Airrex Bags, 20" Forgestar F14s, Meisterschaft Catback Around town- E60 528i N52, 6AT, Monaco Blue Weekend - 1997 BMW Z3 M52, 5spd, Dunkelgrun: 230k mi, Intrax Springs on Bilsteins, Style 68s staggered AutoX/track - 2012 F30 N20, 6MT BSM |
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01-18-2019, 10:56 AM | #41 |
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No that was nearly a year ago and I’ve replaced many things since then but no improvement. My latest idea is the fuel tank vent valve. I was going to replace it last weekend but got sidetracked. Maybe this weekend.
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01-30-2019, 12:07 AM | #42 | |
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1. Never touch the break pedal & key remains inserted the entire time 2. Insert key and push START Button 3. Press and HOLD accelerator pedal for 30 seconds (some say 5, some say 25 seconds - I did 30 to be sure). 4. WITHOUT RELEASING THE ACCELERATOR PEDAL, push the START Button 5. Release accelerator pedal 6. Wait full 2 minutes 7. Start car normally Hopefully it works for you. |
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02-22-2019, 12:54 AM | #43 |
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Rowsdower, just read two threads of yours. I am starting to think that the BPC tune might be the problem. Seems like all the guys with AA tune and their headers are fine on E90post and 1addicts but not BPC. However, I have been consistently getting 002c3a and 002c9 o2 sensor delayed response since the tune and headers installation about 1 year ago. Is it possible for a tune to create o2 sensor faults?
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02-22-2019, 08:06 AM | #44 | |
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I don’t think the tune is causing the faults. It is very common to have an O2 sensor die after doing headers. I had some O2 codes that went away when I replaced the sensors, just still have the idle problem. Forgot to update this thread - couple weeks ago I replaced the fuel tank vent valve, crankcase breather hose, throttle body gasket and intake manifold gaskets, and checked both DISAs (removed them, checked for play, and activated with INPA - they are fine). No difference. |
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