[Bugsyt]

Hi, all Had my 335i auto for two weeks. Just had engine fault warning light come on, yellow in dash warning symbol, and iDrive message saying engine fault, reduced power. Continued 60 miles slowly, no noise but definite power loss. When i stopped at home, and re-started the light went out.
Any ideas please. Can't see dealer until Monday.

[zltm089]

does it come on after a long drive?....keep testing it for a few more days....

not a good sign!

[neil@JuicedUpTuning]

Originally Posted by Bugsyt

Hi, all Had my 335i auto for two weeks. Just had engine fault warning light come on, yellow in dash warning symbol, and iDrive message saying engine fault, reduced power. Continued 60 miles slowly, no noise but definite power loss. When i stopped at home, and re-started the light went out.
Any ideas please. Can't see dealer until Monday.

CEL is a symbol for a whole range of issues. Only way to tell is to scan for codes using a code reading and deleting tool. BT Cable, BMS CT Tool or going to a garage.

[khurmit]

Did it come on the moment you decided to "UNLEASH THE FURY"??? or did it just randomly pop up as you were cruising at a steady speed?

Basiclaly mine did the same thing and got me a bit worried - codes etc read by BMW, turns out to be something to do with the Vanos Soleniod for the exhaust (hence why it only popped up under WOT, and continues to randomly pop up when I am "flooring" it).

Anyways after a bit of a search on the forums, turns out it's a simple 1/2 hr DIY job to replace the solenoid, which is in an easily accessible position.

I Just need to find out the price of the unit, then get it fitted - prob by my mate at BMW ;-)

Basically I just wanted to re-assure you that although it might seem catastrophic when you see the EML come on, there is light at the end of the tunnel.

Although your prob might be more serious than mine......

[muffking]

Originally Posted by neil@JuicedUpTuning

CEL is a symbol for a whole range of issues. Only way to tell is to scan for codes using a code reading and deleting tool. BT Cable, BMS CT Tool or going to a garage.

+1
Get yourself a fault code reader. you won't need to spend much and it could save you a trip to the garage, or at least it will point you in the right direction if the a fault code was logged in the ECU.

[fastloop]

Lots of possibilities here and as said without reading the codes it will be a stab in the dark.

Common causes:

• Misfires (Bad spark plug, ignition coil, fuel injector. Bad DME software - I think progman versions v32-v34 had some bad adaptations that would cause misfires on Bank 1 (cyl 1-3) on longer journeys. Updating the software is the only way to fix these. )
• Boost leak (Substantial leak, e.g. FMIC pipe popped off. Would trigger on WOT)
• VANOS (Vanos solenoids may need replacing)

Get the codes read and let us know.

Does it disappear if your stop/start the engine, or leave it for an hour or two? Does the engine feel lumpy or doesn't run as smooth as normal? Most of the above issues are fairly easy to fix and not too expensive, but it depends on if you know a good indy and if you have a bit of patience. Dealers sometimes take the big hammer approach to this and replace a lot which is fine when you have warranty. Out of warranty, paying ~ £2K for 6 new injectors is no fun and everything else should really be tried before spending this kind of money.

[pjs]

Coils, injectors, plugs, vanos solenoids, HPFP. Will be one or more of these based on my experiences.

[MEGA]

If you are out of warranty might I suggest you call Jason at BW chip tune (unless you know a local specialist)

He is very well skilled with these engines and can of course also read / interpret / delete as necessary the fault codes.

07831 103030

Tell him Dave / Mega sent you..

[zltm089]

Originally Posted by pjs

Coils, injectors, plugs, vanos solenoids, HPFP. Will be one or more of these based on my experiences.

PLUS ONE

[m1bjr]

The VANOS code doesnt necessarily mean its a solenoid.
There is a known wear issue with the camshaft ledges, which cause loss of pressure I guess.
You will find the vanos gears dont position as quickly as they should as a result and you get a vanos tining error.
Sometimes low oil / oil surge / hard cornering on rough like track kerbs can cause it, or simply dirty lube.

Needs more info.

[tuningas]

hi everybody .i have bmw 335i e92...and today i had a flat battery,i was not driving it for a week...so i started car with the jump leads.and then went to the other town,i was going 150 miles per hour and then suddenly engine fault reduced power comes on my dashboard.i stopped with my car,turned off and started again it was ok while i not pushed the accelerator,so it comes on again...any suggestions?does it happend because of the flat battery?thanks

[fastloop]

Unlikely to be related to the battery. You really need to read the codes with a BT, GT1, AutoLogic or other tool that will read BMW specific codes.

Common causes are:
- Bad ignition coils
- Fuel injectors
- Spark plugs
- VANOS fault
- HPFP fuel pump
- Boost leak
- etc.

Until you read the codes you won't really know.

[tuningas]

but that light came straight after flat battery,when i was accelerating,and before never came on

[fastloop]

AFAIK, the adaptations will not reset by just pulling the battery (or running it flat), so I think it's a coincidence.

Generally the Engine Fault is more likely to happen under load. So just idling or very light throttle will most likely not trigger the fault.

Is the engine feeling lumpy or is it running smooth? E.g. if it feels smooth then it could be that you have a boost leak. E.g. FMIC coupling popped off.
If it's lumpy then you probably have a misfire.

So all that's changed is that the battery went flat and you then did a highspeed run? If the following is not a typo then, the engine would have been under full load, so it could be a number of things.

Originally Posted by tuningas

i was going 150 miles per hour and then suddenly engine fault reduced power comes on my dashboard

What fuel are you using?

[tuningas]

its running smooth,but i think its has less power..i am using unleaded.and when i am driving on small revs engine light does not comes on

[zltm089]

From my own experience...the engine light came on, after 1 hour's drive...(non stop) ...and it did highlight the common issues...(injectors, HPFP, vanos etc) ...BUT THE WARNING LIGHT CAME ON AFTER A LONG DRIVE....so if you drive your car for short journeys, then you won't even know if you have these issues or not...

[zltm089]

Originally Posted by tuningas

its running smooth,but i think its has less power..i am using unleaded.and when i am driving on small revs engine light does not comes on

go for long test drives and short test drives....

I bet you, it will come on after long test drives....(i.e more than 1 hour) ...and i bet you it will be one or all of the COMMON faults of the 335i...

[zltm089]

Originally Posted by tuningas

hi everybody .i have bmw 335i e92...and today i had a flat battery,i was not driving it for a week...so i started car with the jump leads.and then went to the other town,i was going 150 miles per hour and then suddenly engine fault reduced power comes on my dashboard.i stopped with my car,turned off and started again it was ok while i not pushed the accelerator,so it comes on again...any suggestions?does it happend because of the flat battery?thanks

150 mph is quite fast... which motorway was this on?

[fastloop]

You really need to get the codes read as everything else will be pure speculation. Find a local indy that have an AutoLogic kit and get them to read the codes for you.

If the engine is running smooth, then it could be that you have a boost leak and under light load the engine management finds that it can't build boost and throws an error.

E.g. have a look a the pictures in my thread below. This shows the IC connector that could be loose.
http://www.e90post.com/forums/showthread.php?t=373990
It's a splash tray off to get to the connector, but you may be able to see it from the top.

[fastloop]

Originally Posted by zltm089

From my own experience...the engine light came on, after 1 hour's drive...(non stop) ...and it did highlight the common issues...(injectors, HPFP, vanos etc) ...BUT THE WARNING LIGHT CAME ON AFTER A LONG DRIVE....so if you drive your car for short journeys, then you won't even know if you have these issues or not...

The issue with misfires happening on longer drives is known issue with the DME software. From memory ISTA versions between 31.1 - 34.0 had a problem with the DME adaptation that would cause misfires on bank 1 (cyl 1-3) on longer journeys. I can dig up the bulletin numbers if needed, but updating to the latest software will fix this.

[tuningas]

Originally Posted by zltm089

150 mph is quite fast... which motorway was this on?

it was on A1073 road m8,with 335i u dont need long way to achieve 150mph

[tuningas]

Originally Posted by 335rocks

The issue with misfires happening on longer drives is known issue with the DME software. From memory ISTA versions between 31.1 - 34.0 had a problem with the DME adaptation that would cause misfires on bank 1 (cyl 1-3) on longer journeys. I can dig up the bulletin numbers if needed, but updating to the latest software will fix this.

can i have more information about this...u wana say i need to update some software or what?cheers