Just another day! *FAULT RETURNS FINAL UPDATE*

The other issue of course is that it's an intermittent fault. To be fair these are a bastard to fix unless the fault is showing at the time.
 
srhutch said:
The other issue of course is that it's an intermittent fault. To be fair these are a bastard to fix unless the fault is showing at the time.
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I think this is the main issue srhutch! Although to be fair, once the engine is warm it is always there in some degree. The dealers with the help of BMW ran many fuel pressure tests and actually recorded various degrees in loss of pressure, hence BMW telling the dealer which parts to check and replace. The question is if they were able to detect and monitor the pressure drop then I would have assumed that once the fuel pump, fuel pressure regulator, fuel pressure sensor and fuel filter had been replaced they would have re run the same tests to check for any further pressure drop. If they did run the test, which I assume they would have done and no pressure loss was recorded then why has the fault returned after 400 miles? I don't know a lot about the workings of the engine, but if they have checked all the associated pipes/hoses for splits that would contribute to air loss, then could it be down to a possible hairline fracture on a component or hose connector somewhere, basis for this being that it only happens when the engine is warm, so thinking along the lines of expansion?? Hardest part is to locate the litter Fu*ker :headbang:
 
In any proper troubleshooting exercise you must start at the beginning and and eliminate each potential point of failure a step at a time.

So for me step one would be where the fuel starts its journey. So have they had your fuel tank off to see if there is something in there floating around that intermittently impedes the ability of the pump to draw off fuel at a sufficient rate?

Or have they started in the middle replacing items that rely on other components in order of precedence?

Twice in my lifetime I have removed things from fuel tanks that should not have been there and one of them was a short length of electricians tape that every now and again would get sucked over the outlet from the tank causing fuel starvation and kangarooing. Garages would (and did) queue up to offer carb strip downs and rebuilds or fuel pump/regulator replacements when presented with such symptoms. They were all wrong and I found this to be typical of many problems and lost all confidence in most dealership mechanics many years ago. Good indys knock the socks off most dealers for expertise and knowledge these days.
 
GreyZed said:
In any proper troubleshooting exercise you must start at the beginning and and eliminate each potential point of failure a step at a time.

So for me step one would be where the fuel starts its journey. So have they had your fuel tank off to see if there is something in there floating around that intermittently impedes the ability of the pump to draw off fuel at a sufficient rate?

Or have they started in the middle replacing items that rely on other components in order of precedence?

Twice in my lifetime I have removed things from fuel tanks that should not have been there and one of them was a short length of electricians tape that every now and again would get sucked over the outlet from the tank causing fuel starvation and kangarooing. Garages would (and did) queue up to offer carb strip downs and rebuilds or fuel pump/regulator replacements when presented with such symptoms. They were all wrong and I found this to be typical of many problems and lost all confidence in most dealership mechanics many years ago. Good indys knock the socks off most dealers for expertise and knowledge these days.
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I know they dropped the fuel tank twice, but did they check the tank for any foreign bodies or crap in it, I would assume that they should have, but we all know what assume really means, but I will be asking the question when I take it in. I am still thinking it is something minor that is the root to all this, something the mechanics might have looked at, but dismissed and moved on without really having a good close and thorough inspection!
 
andysat said:
Feel for you mate-been down that 'replacing parts as a process of elimination' route myself :thumbsdown:
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Thanks Andy, I remember yours well and you managed to survive that particular journey. Think I will just have to stay the course as well and hope that they resolve the fault quickly.
 
Arghh just read through this complete thread, I hope u get it sorted soon Swiftly

Always an owners worse nightmare :thumbsdown:
 
Keyper said:
Arghh just read through this complete thread, I hope u get it sorted soon Swiftly

Always an owners worse nightmare :thumbsdown:
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Thanks Keyper, I will be chatting with the dealer next week to clarify exactly what ther next plan of action will be. Watch this space as they say!
 
Mate your having rubbish luck and I feel or you! I have not had the best luck with mine. I have a list of problems I honestly don't think BMWs are built like they used to be :(

It's a shame the bmw dealers don't seem to be ably to fix this. At least they are picking up the bill. I really hope you get your car fixed very soon :thumbsup:
 
Another one for you drawing on my extensive history of running cars that broke-down regularly, blocked tank breather or scavenge system?
Blocked/obstructed/kinked tank breathers lead to a vacuum in the tank reducing the fuel pressure available at the engine (easy to check for, run the engine for a while under the problem conditions and open the fuel cap you can sometimes hear air drawn in as you break the seal).
The scavenge system returns unused/excess fuel from the injection back to the tank, leaks, blocks, kinks or dodgy valves can all cause problems.

Unfortunately the Z4 has typically complex systems for both (breathers used to consist of a pin-hole in the fuel cap :roll: )

http://www.realoem.com/bmw/showparts.do?model=BT32&mospid=47796&btnr=16_0538&hg=16&fg=15

http://www.realoem.com/bmw/partgrp.do?model=BT32&mospid=47796&hg=16&fg=10
 
Ewazix said:
Another one for you drawing on my extensive history of running cars that broke-down regularly, blocked tank breather or scavenge system?
Blocked/obstructed/kinked tank breathers lead to a vacuum in the tank reducing the fuel pressure available at the engine (easy to check for, run the engine for a while under the problem conditions and open the fuel cap you can sometimes hear air drawn in as you break the seal).
The scavenge system returns unused/excess fuel from the injection back to the tank, leaks, blocks, kinks or dodgy valves can all cause problems.

Unfortunately the Z4 has typically complex systems for both (breathers used to consist of a pin-hole in the fuel cap :roll: )

http://www.realoem.com/bmw/showparts.do?model=BT32&mospid=47796&btnr=16_0538&hg=16&fg=15

http://www.realoem.com/bmw/partgrp.do?model=BT32&mospid=47796&hg=16&fg=10
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Thanks for the advice Ewazix. I will certainly try opening the fuel cap and see if I can hear any air being drawn in. Wouldn't it be great if it was as simple a fix as this!
 
Had the car in last Monday at the dealers to get the broken rear spring replaced, which was covered thankfully under AUC warranty. :D

Also wanted them to check the management light that had come back on, but sods law the light went off when I started the car up to set off to the dealers. :headbang:

The dealer said that they needed the light on to run tests, even though you could hear the rough idle at start up. The code stored was the same generic fault as previously recorded. :headbang: :headbang:

As expected the management light came back on again two days later, so back to dealers this morning so that they can run some more tests. Outcome is same fault recorded as before despite all the time taken and parts fitted, no surprise there. :x

The dealer has kept the zed and have now requested further advice and assistance from BMW UK. If they are unable to assist with the fault then it is being escalated to BMW Germany to handle. For all I have moaned the dealer really has been fantastic and their customer server has been outstanding. Like me they are frustrated as they have done what BMW has advised them from the results of the tests the dealer was asked to perform. Looks like the zed could be off the road for a week or so as they said they won't be giving me it back until it is fixed, due to all the inconvenience I have been subjected to so far. Trying to look on the positive side, may be, just may be they might get to the bottom of it. Just hoping that it doesn't take them to long as I was given a new BMW 1 series 1.4D to drive, :lol: which is total gutless wonder to drive :thumbsdown:

Perhaps this time next week I will have some good positive news to give out, I hope ....... :roll:
 
Jesus Swiftly, hope they sort it this time for you pal. All that hassle you have had would do me in if I am honest :cry:

Stick in there :thumbsup:
 
Not what you want to hear but if there was the remotest chance of handing the car back to the dealer then i would :|
it would eat into my ownership enjoyment too much :wink:
 
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