you most likely have an air leak some where.hello, i have a x reg 318 ci and the emissions light has come on, i use a mac tools code reader and it has read the code p0170 Fuel Trim Malfunction (Bank 1) has anybody had this fault or anybody know how to tackle this problem?
this looks like it would have been my thread, as my car is experiencing these exact probs too.....and more
to put you guys in picture, i got this P0170 code 18 months ago, so i checked everywhere, and found the crank breather hose was split, so i replaced, but within 12 months, i had water leaks all the time, oil leaks, so all was getting on my nerves.
found the following during 12 months:
cracked thermostat housing...replaced
cracked expansion bottle...replaced
cracked connector as shown in #5 here http://www.realoem.com/bmw/showparts.do?model=AL32&mospid=47631&btnr=11_2082&hg=11&fg=35 ...replaced
pending camshaft position sensor fault...replaced
oil leaking from filter housing to body...new seals and gasket...fixed
still getting P0170 code, so replaced 02 sensor pre-cat still have P0170 fault no matter how many times i clear fault with carsoft 6.5 software
my car is sluggish at take off when cold, and hesitates at lights and standstill to take off, there is a lag of power.
oops, that's another i missed off, the crank case valve, i replaced that too last summer as it was hissing as you put it. also, it has had regular services and plugs are changed every 12 months, even though they were not needing replacing, i was just eliminating problems.Right dude,
You have 2 possible faults that will kick out a P0170 code (since you've changed all else)
1- change the crank case vent valve- is it leaking/hissing?
2- the MAF is faulty.
seen this many times including on my E46.
If there are no air leaks: It can only be the valve and/or MAF
The valve is around £40 from ECP, maybe cheaper can't remember.
ECP do the Bosch MAF from 120..........they also do a cheaper MAF at around £50 or so, cant remember the brand but If i was gonna keep the car- I would opt for the Bosch.
Go for the cheaper otion of trying the valve first- these fail anyway and do have an effect on emisions- so changing it wont hurt and if it fixes the problem- great!
If you change it and still the light pops up................its the MAF 100%
ouch, please NO!!!!!!!!
i am gonna try and look for split pipe in meantime, or if anyone close to Manchester with 318ci wants to swap sensors for a spin around the area to eliminate or prove fault.
i still have this problem with my car, and the one thing i did notice was that in the winter when it was very cold the engine warning light went off for a day or so, does this giv any ore clues to the problem with my 318 ci?
have you cleaned the MAF sensor m8?Hi all,
I've got similar problem with my 318 2000, as the engine management light is on for about a month now, the Oxygen sensor, camshaft sensor and pipes were changed by BMW but still on, last time BMW told me it's the Cat. not working efficiently.
I took to Kwik Fit, as I have guarantee with them, the checked the emission and I told it was ok, but it kept on. Now the reading code is P0170 fuel correction bank1.
I really don't know what to do, as it become too expensive with all these replacements.
Any advice would be most appreciated.