riles Posted May 18, 2009 Report Share Posted May 18, 2009 hi here goes!!! my 2003 318ci has developed this problem over the last couple of days. (its driving me crazy) -car is low on power (guttless, no pull) -induction noise is different (pipercross filter) -strange rattle (or similar) from inlet manifold area (only happens when the throttle is pushed or let off sharply also the car has had a blown exhaust for a few weeks now(fixed temporarily) but possibly could have got worse (this would explain the change in induction noise) but could the power be down because of a exhaust 02 sensor? but what about the rattle from engine? all these problems appeared together shortly after an enthusastic drive (new eibach springs and bushing done, handles good have had a quick look over and one thing i notice, engine idle seems lumpy(a bit stuttery) also when i remove the oil filler cap when engine is running,there is a change in noise and engine idle is very bad,(nearly cutting out) crank breather?? googled the problem and DISA valve keeps popping up any ideas? cheers Link to comment Share on other sites More sharing options...
riles Posted May 19, 2009 Author Report Share Posted May 19, 2009 has any 318ci owners had trouble similar to this??? Link to comment Share on other sites More sharing options...
MattBMW Posted May 20, 2009 Report Share Posted May 20, 2009 tbh sounds like you have a vacum leak somewhere check the intake boot or seals on the intake manifold could have gone. Other things to cause this would be a faulty DISA and a malfunctioning MAF sensor. The other thing that could make things worse seem worse at idle is you have a gunked up ICV (idle control Valve). Firstly I would get the car scanned and diagnosed for any fault codes...just because the engine management light don't come on does not mean there are not codes there. IF it comes up clear then I'd listen for where the excessive noise is comming from. It could from either or a combination of two or more things. If its the DISA you can unplug it and see how it idles and reves? does the rattle disappear?. if yes then the DISA is on its way out. Does it still have a rough/lumpy idle? if yes first try unplugging the maff and restarting the car is the idle any different? if no then it's not your maff. I would look for post Maff leaks and check and clean the ICV and try again. See what you find and post up any results. Link to comment Share on other sites More sharing options...
simonlpearce Posted May 20, 2009 Report Share Posted May 20, 2009 x 2 on what Matt said, look in the DIY section for engine whistle as this will give you an idea on where to look for split hoses. Link to comment Share on other sites More sharing options...
duffman Posted May 20, 2009 Report Share Posted May 20, 2009 x3 i had same problem years ago on my 318 loon Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 just back from my mates garage there. got his opinon on the problem. he suppects its the disa thats causing the problem. stripping the inlet manifold off at the weekend to clean and check everthing. if it is the disa, is it fixable or will it need replaced, how much are they?? and why do they fuk up?? cheers j Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 just back from my mates garage there. got his opinon on the problem. he suppects its the disa thats causing the problem. stripping the inlet manifold off at the weekend to clean and check everthing. if it is the disa, is it fixable or will it need replaced, how much are they?? and why do they fuk up?? cheers j Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 just back from my mates garage there. got his opinon on the problem. he suppects its the disa thats causing the problem. stripping the inlet manifold off at the weekend to clean and check everthing. if it is the disa, is it fixable or will it need replaced, how much are they?? and why do they fuk up?? cheers j Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 just back from my mates garage there. got his opinon on the problem. he suppects its the disa thats causing the problem. stripping the inlet manifold off at the weekend to clean and check everthing. if it is the disa, is it fixable or will it need replaced, how much are they?? and why do they fuk up?? cheers j Link to comment Share on other sites More sharing options...
MattBMW Posted May 20, 2009 Report Share Posted May 20, 2009 wow triple post....unfortunately you will need to buy a new DISA...not sure how much these are but I'd try a few places first such as GSF, Eurocarparts and BMW C3 and finally the stealers just to compare prices if they have them. The go tits up due to the recirculation of unburnt gasses which are then recycled to help reduce emissions. Normally oil vapour should be caught and cooled into the crankcase vent valve (CVV)over time it's efficiency reduces and it lest more vapour through which then recirculates into the inlet manifold where the DISA is situated. As the car is cooling oil vapour that has been already recirculated into the intake manifold then cools and clings to the inside of the intake manifold and the DISA. Obviously over time this takes it's toll on the DISA valve. Be carefuful when removing the inlet manifold not to brake anything as pipes/hoses deteriorate over time, they become brittle and less flexible. Good luck and don't forget to clean the throttle body and ICV whilst the manifold is out and check all hoses for any leaks! Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 lol i cant find any sites that sell this disa valve?? is called something different? also it would be common sense to change any other problem parts around the inlet area while it is stripped down? what parts would you recommend changing? cheers j Link to comment Share on other sites More sharing options...
riles Posted May 20, 2009 Author Report Share Posted May 20, 2009 http://www.realoem.com/bmw/showparts.do?mo...hg=11&fg=40 could someone point out the disa valve? does this n42 engine have vanos? cheers Link to comment Share on other sites More sharing options...
