35i 2007 coupe. 2 days ago started car cold in the morning. The engine was juddering & knocking like it was running on 3 cylinders.i drove the car for about 100 yards, yellow warning light came on so then stopped, then turned off the engine, waited a couple of minutes then started car with no more problems during that day. Yesterday from cold exactly the same thing happened, so again stopped car, switched off engine, left it a couple of minutes then started car with no problems during the day. Today from cold tried the same thing happened but this time the fault did not rectify itself. lots of smoke from exhausts and smelled like it was running rich. So have taken it to BMW which was about 12 miles away going through about 1/4 of a tank of petrol. Can you tell me what the problem may be as it sound like it could be really expensive.

SOURCE: Renault Megane Coupe-Cabriolet juddering problem

Or dont keep your foot on it all the time as this will make it hot, Best is to go into Neut as much as you can to give it a rest from biting all the time

Rob Sinbad

• 709 Answers
• Posted on Jul 25, 2009

SOURCE: 325i BMW, 2003 (Automatic) Fuel Pump/Filter or

your camshaft position sensor may be going bad. usually with an old car it tend to go bad. The top of sensor can be covered or gumed up with grease, oil, dirt and cause it not to detect the flywheel turning. Camshaft sensor send single to your DME to deliver fuel and sparks to you engine. If camshaft sensor goes bad it will seem like your fuel pump and ignition coil is bad even-though they are good. Faulty camshaft sensor may caused you to have this issue and problems such as sometime it run good and all of sudden it shut off, sometime its start good and others time is doesn't start. Once the sensor goes bad, the car will not run. There are two Sensor one for the fuel and one for the sparks, I would replace both sensor because soon or later if it will go bad, it will leave you stranded although if you replace one you might as well replace the other. Check the coil and test using the light or volts tester to see you getting power to the coil, next check if your fuel pump is working, fuel pump will not stay running unless the sensor sense the flywheel is turning from your camshaft sensor. next time when your car does not start, check if you getting spark and fuel. Both sensor will cost you around 130 bucks. assuming your DME, fuel pump, coil, wires, etc... is working. keep me update and I will try to walk you through. btw stop by at any auto part store and pick yourself up Haynes auto repair book for your car, its a great tools and investment to have for your next repair work if you plan to keep your car and get to know the heart of it. good luck and i hope that help some.

SOURCE: bmw 325i 2003 stall

Sounds like you have a small bit of dirt or grit in the fuel system when accelerating it is drawn with enough force to cut off the fuel supply then is released when engine at Idle.
1 run liquid fuel line/injector cleaner in 1 tank
2 check fuel lines for debris
3 change fuel filters
4 have fuel tank flushed
here is trouble shooting order less expense to greater.

SOURCE: I have a petrol smell in the boot of my BMW 320

replace the two rubber gas lines where they connect to the fuel rail, they're about 2" long. If you don't.....it will catch fire and we'll all see on on the side of the road in the carB-Q.

SOURCE: how do you replace a petrol fuel pump on a bmw

You can get access to the pump under the back seat or in the booth lift up the mat twist the plastic screw by hitting it with a screwdriver and hammer remove eletrical plugs there should be two clips holding in pump press these two so as to release pump.