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Discussion Starter · #1 ·
Hi everyone

I've owned my 528i touring for quite a while now and it has run like a dream since day one. However, it has recently started cutting out when left idle. It doesn't do it all the time but I would say at least a couple of times a week. For example I would be coming up to traffic lights and be breaking, rolling to a stop (the car is Auto and in drive) then it would just quitely cut out. It does start again immediately but it's a frustrating problem! Also, the car sometimes misses a beat when driving, i.e. looses power for a split second but then is fine again.

Has this happened to anyone else here? I know I need to take it to a specialist to plug it into a computer and check for error codes but I just wanted to know what to expect. Could it be a fuel pump issue, the auto box need servicing, broken sensors, etc?

Thanks
 

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Discussion Starter · #3 ·
Thanks for that. I was thinking of trying to fix this myself rather than go to the stealers (having compared prices of spare senors etc on the net with those that dealers have charged to people in other threads). If I bought a tool like the one below would it diagnose the exact problem - i.e. faulty mass air flow sensor, camshaft senor or crankshaft sensor? If not, I'll just take it to the stealers next week. Thanks

http://cgi.ebay.co.uk/U380-OBD-2-II...286.c0.m14&_trkparms=66:2|65:15|39:1|240:1318
 

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You have the round diagnostic port under the bonnet don't you
View attachment 2029

The scanner you listed will be NO good, wrong plug end and it won't read the manufacturer specific codes which are the important ones, you will be better of with either a Peake Research tool or Carsoft, but to run Carsoft you will need a older laptop generally.

As for bringing up faults, only certain sensors will flag up faults, for example if a Crank sensor doesn't see a signal a code will be stored.

BUT a air flow meter or engine coolant temp sensor may not, if the temp sensor tells the ECU the water temp is 60.C why should it not be???? the sensor can go wrong and tell the ECU the wrong info without flagging a code, like your eyes can tell you something is green, but it's blue because you are colour blind :) there's nothing to verify what the temp sensor is saying is correct.

Why not take your car to a BMW specialists to get them to look at it, doesn't have to be a main dealers, plenty of good ones out there :)

You could also just have them scan the car and then give you a print out of faults then post them here and do the work yourself.
 

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Thats exactly what my 528 was doing, code read Mass air meter and fuel vent valve, it was the crank sensor. Exact same symtoms.

£20 for a new one and a doddle to change
 
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