Hoping someone can help with this issue (have almost exausted all avenues on this issue) ........
I drive a 2003 E46 320d sport saloon (125,500 miles on the clock) - I am experiencing power loss problems. The turbo doesn't seem to be delivering full boost. The car has had the following work done ......
1. Turbo & CAT replaced at 110 k miles - turbo worked perfectly after replacement - independant garage did the work.
2. Fuel pumps & filter (tank & intermediate pumps) replaced at 125 k miles - independant garage did the work.
3. All 4 injectors & fuel pump relay replaced at 125 k miles - main fuel pump checked and passed as ok - main BMW dealer did the work (4 new injectors & relay switch).
4. Air Mass meter & air filter replaced at 125 k miles - independant garage did the work.
Car has been put on computers at main dealers and 2 independent garages with no faults showing up - however all agree that car is not boosting properly. last garage checked boost pressure and said all was ok (no turbo leaks etc evident). However the shove / turbo that was evident from 1750 - 3000 revs before seems to have reduced/dissapeared. The fuel pump and finally the injectors needed to be changed when the car developed starting problems (low compression in the injector rail) - the power loss problem also seemed to appear around this time.
I would appreciate any ideas you may have as to what the problem as at this stage I don't know what my next move should be. The problem initially became noticeable before the fuel injectors were changed (i assumed changing the leaking injectors would solve the issue). So much for the ultimate driving machine mantra!!!
Edited by Dynamic Dave on 14/04/2008 at 11:22
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Pat
What a mess. Doesn't any one of them believe in the concept of testing? Fault codes are now almost an irrelevance - reams of live-data contain the crucial information.
There is no point in throwing what must be thousands of pounds of parts at a fault without understanding the nature of the problem. How can anyone fit four injectors just in case one has failed - without testing first....?
You state that the turbo "doesn't seem to be delivering full boost" - yet the live-data reportedly says that it is. Has anyone checked the EGR system's functionality? Or the variable inlet system? Whatever it is; it's beyond the ECU's feedback loop, so forget looking for codes.
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Although not the cause of this issue, was the crankcase/turbo breather/seperator filter replaced when the turbo was done? There has been an issue with these getting blocked, causing oil pressure problems. Only around 30 quid from a BMW parts dept located near the air filter, quite simple to change.
Might also be an issue with the pressure convertor pumps on the EGR and turbo vane vacuum system, if one of these has packed up, or the rubber vacuum pipes between them are split, the vacuum will be lacking or insufficient to properly operate the EGR valve or the turbo vanes.
Have a look on www.bmwland.co.uk do a search on 'pressure convertors'. Also have a look at the diagram of the system on this great BMW parts site www.realoem.com
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Hi there, im have a BMW E46 320cd M Sport Coupe '05'. Im having starting problem, took it down to diesel specialist, he done a leak of test and has told me tht 3 injectors are leaking. however, can u advise which fuel pump u changed? was it the one under the passenger seat. im having starting problems, car comes with 'low compression at cranking' code. however, once car started with easy start, it has no problems. hopefully the injectors sort it out....but the car only has covered 65K on the clock but has been ramapped to 200bhp.
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If you have got low compression at cranking then fuel pump replacement will not help. It will be a problem related to the engine itself (general wear, valves not seating etc.). Is the battery spinning it over OK?
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thank you for your reply, yeah the battery is spinning over ok.....
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