Hi all. I have recently brought a lovely 2011 Z4 s drive, 23i which has been great till yesterday. I stopped at a junction and the car shuddered and cut out, I started it back up and drove home with no issues but the revs are low when stationary at around 500 to 600 rpm. On the way to work this morning exactly the same thing, the engine warning lights is on and still low revs....any ideas?
Low revs when stopped and occasionally cuts out out
- Thread starter Shaun T
- Start date
I'm trying to get it booked in...looks like a slow drive home from work today. I have a cheap reader that I tried last night and it came up with p22aa which just belive is the nox sensor, p0000 ECU? And b2a00 ECM?
But there were no engine management light on last night, this came on at lunch time today after I drove 21 miles to work.
But there were no engine management light on last night, this came on at lunch time today after I drove 21 miles to work.
Shaun T said:
There is no nox sensor on the N52 in the UK..
Those fault codes could point to many issues including bus communication failure and other ECU and sensor issues ….you’re probably going to need a full bmw diagnostics system to bottom that out..
Well drove it home and engine light was on, no oil warning light but car did cut out when I stopped as it warmed up. I asked the guy at the garage if it was a timing chain issue would it run smoothly and only change when the engine starts getting warm. He said he was surprised how smooth it sounds when ticking over but did say there was a small rattle when he started it . Told me again £3500 to change the chain then investigate the faults more when it's replaced
Hiya, i am at a loss with it. It is such a beautiful car in fantastic condition and to good to scrap but I don't know which garage can be trusted to sort it out and get rid of the faults. It's done 95k miles and runs perfect when started from cold, all the roof mechanism has been serviced, alloys all done and is a head turner. To be quoted £3500 to replace the chain etc as a min to me seems a rip off. Then they saidnthey would look at the codes and what ever else needs replacing
Shaun T said:
Firstly, this 'garage' sound shite. Stop going there. If you don't have your own code reader yet, get one; I use an Autophix 7910, it does most of the things you could need it to and can just sit in the glovebox.
If the chain was that bad it needed replacement the car would be a bag of nails all the time, if it started at all.
My thoughts are this points to the VANOS solenoid, so a free test would be to swap intake and exhaust over then clear the codes and see if the fault moves.
The oil pressure is a concern but wouldn't cause it to cut out. Easy to take the filter off and check it.
Thank you so much for your help on this it has really stressed us out. If I replace the Vanos unit then hopefully it will sort it out. The previous owner hardly used the car so sat for quite a while with occasional drive around the block.
Not sure what the codes meant from the garage tbh..
Not sure what the codes meant from the garage tbh..
You're welcome.Shaun T said:
For the VANOS solenoids it is possible to clean them but faults usually come back, so replacement is the best course. Buy OE from BMW though, the knock offs don't last.
But I would suggest just swapping them over for now (easy DIY though access might be a little tight) just to see if the fault moves. Though you'll need a code reader. Getting one is a good investment rather than keep paying garages when you change battery etc.
If the oil has sat for a while it could be sludgy. Where are you located, maybe a friendly member could help you do a DIY oil change for some beer tokens?
