Engine Running Big Problem,help - BMW Forum - BimmerWerkz.com
5-Series (E12,E28, E34, E39, E60) Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)

 
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#1 (permalink) Old 02-05-2005, 02:04 PM
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Can anyone help?
Have a 5:25 se 24v and since 1999 the vehice has been back to various specialist in the north-west uk with Engine running crap! it continues to run badly not idling but hunting and using fuel fast and although it gets fixed for a short period of time, the problem re-occurs, After 6 new coils and eating lambda sensors (sorry about spelling) still have a vehicle that wont idle and run correct, Have found that if i drive the car hard it will go away for a short period, last sensor has done 1400miles and this time cannot get vehicle to run as it should? can anyone help me
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#2 (permalink) Old 02-06-2005, 04:59 PM
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As you may expect since various specialists couldn't solve the problem, not sure how much can be done over the net. I'll try to summarize the problem and put it in a perspective for further help.

1st what year is this car, how many miles etc.?
2nd any codes (check engine) were given to you from the specialists?
3rd did they check for leaky injectors?
4th Black smoke etc

This is what we have:
A. Rough idling
B. Too much gas consumption
C. Blown- left and right- O2 sensors.

One of these specialists has to say something about ABC above!!!
when engine run too rich/too lean rough idling is the norm. Too much gas is rich, O2 sensors go nuts over their limits trying to correct/trim mixture and then fail? Cat will not survive (since 1999) all this mess!

Anyone wishes to take it from here?
regards
billb
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#3 (permalink) Old 02-06-2005, 05:14 PM
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Just a thought - and BMW should have already done this - Unscrew the lead from the MAF sensor and see how she runs, if the problems disappear its a dirty/knackered MAF, if not then the MAF is OK. If it does run better, remove the MAF part of the induction and spray the two wire sensors inside with CARB cleaner (making sure there are no obvious probs with these two probes - mine had a big lump of cotton from a K&N filter hanging on it.) then replace. This may or may not work but if it does it will save you £350 from the Stealer.
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