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chasing it up and down at low rpm
I have an X5 E53 3.0L diesel, at 1000-2000 rpm is it chasing it up and down and having unstable rpm, I thought it was the air mass meter that was wrong but it didn't help to replace it - Someone who knows what can be wrong? Thankful for all suggestions :-) |
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#2
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Does diesel use IAC valve ?
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2011 E70 • N55 (me) 2012 E70 • N63 (wife) |
#3
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Quote:
The turbo boost is controlled (VNT/VGT) and the fuel is controlled (injection duration etc.) but that's it. Oh, there's a controlled EGR too but that doesn't affect RPM. For the RPM to hunt either the intake pressure is varying (bad joint on the inlet pipework/intercooler etc.) or the fuel pressure is hunting up and down. Can you run up INPA and check intake manifold pressure and fuel pressure? Both values can be viewed in INPA....
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
#4
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Thanks for the reply, I removed the intake manifoil a while ago to switch the glow plugs, reinstalled it with new seals but of course it may be a gasket that did not fit properly, but I had the problem with rpm before I changed glow plugs but perhaps to a lesser extent.
Suspect that the air mass meter may have something to do with the problem because the problem has varied slightly depending on whether I have used the new or old air mass meter. I will try to read the pressure on the manifole and fuel pressure today |
#5
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Try disconnecting the MAF and see how it runs.
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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course |
#6
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Does this look right?
Does this look right?
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#7
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If you've replaced the mass flow sensor, have you driven the car enough for the car to reset trim and other values?
What caused your car to all of a sudden start running in a strange way? What specific fault codes do you have? Likley not teh root cause at all, but I assume that your air and fuel filters have recently been replaced and that the PCV filter (which you should replace every 2nd air filter OR update to the vortex type) isn't clogged. If you have access to a mechanic's smoke machine, you could easily look for an intake or similar leak.
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2002 Euro X5 (E53) 3.0 diesel (M57) 5 speed manual with UUC short shifter. Pre-xDrive NV125 transfer case (chain & gears). Factory Xenon headlights, Spyder LED tail lights Updated vortex crankcase breather. Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC Bilstein B6 shocks F&R Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S). Dimple magnetic drain plugs in all compartments. Last edited by Gregory891; 01-20-2019 at 04:43 PM. |
#8
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Thanks for the reply
Bought the car this summer and found out that the previous owner has run without air filter for a long time and therefore expects that he also has not changed the pvc filter ever ... did not now that is necessary to have to drive the car for a while for car to reset trim and other values, how far must the car then run before this happens? Has now received a new error message that I have not had before and which I expect may be the cause of unstable rpm, possibly one of the vacuum hoses may have loosened or something |
#9
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I think the most important thing here is the 4530 error code - it's a very generic error code that indicates your boost control isn't working and the boost level is too low when high boost is called for.
From a BMW TIS on error 4530: - 4530 - Charge air pressure control, control deviation, charge–air pressure too low. CORRECTION The possible causes for the induction undercharge/overcharge faults are: Charged air leakage between the turbochargers and the intake manifold; Air filter or air path before turbocharger clogged; Incorrect operation of turbochargers actuators (low vacuum supply for VNT actuator, etc.); Intake manifold pressure sensor malfunction; Excessive backpressure in the exhaust system. There's a few things in there to consider. The vacuum hoses are a good place to start, especially around the turbo and vacuum reservoir on the right side. BTW, the manifold and fuel pressure values you gave above look ok - as far as I can tell from a static value. It would be more useful to see how these vary over time (at idle). But coming back to your 4530 error, you may need to get a small vacuum gauge test set to diagnose this further, as there are multiple vacuum lines and components that can cause this state/error. I use a $30 vacuum tester to check mine (after replacing the exhaust manifold in this case): - In this picture, I'm testing the turbo actuator directly, to ensure the correct movement and travel distance of the actuator rod (and therefore the VNT vanes in the turbo). You can also use this tool to test lines, the reservoir and the pressure modulator. The pressure modulator is high on my list of "suspects" in your fault but I think you may need to systematically eliminate all the possible causes.... Here's the info. on the boost control: - https://www.newtis.info/tisv2/a/en/e...tuator/XN2m7mn and the boost pressure sensor: - https://www.newtis.info/tisv2/a/en/e...sensor/XWfcH87 Air-mass system tests: - https://www.newtis.info/tisv2/a/en/e...m-test/XZFEclB (BTW, there's a line in here I've been looking to find for a long while now - something to indicate that NO X5 E53 ever had swirl flaps - the TIS reads... Component groups of the air mass system The air mass system consists of:
) Oddly, the code 4530 doesn't seem to come up under the DDE 4.x but it is mentioned in the DDE 5.0 (which I have on my LCI): - https://www.newtis.info/tisv2/a/en/e...tuator/XcGISOp Time for a big reading session, my friend! Good luck!!
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) Last edited by wpoll; 01-23-2019 at 06:36 PM. |
#10
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Oh yeah, you also need to change the xDrive transfer case fluid (use BMW OEM fluid) then reset the VTG oil wear adaptations (using DIS or ISTA).
The Braking-force distribution error seems to be present on everyone's e53! Jury is out on how big a deal it is. Neither of these have anything to do with your charge pressure issue but I thought I'd mention them...
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Wayne 2005 BMW X5 3.0d (b 02/05) 2001 BMW F650GS Dakar (b 06/01) |
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