What is life like with your car? Let us know and win £500 in John Lewis vouchers | No thanks
Misfiring, smoking E46 BMW 320i
My E46 started with a misfire then loss of power, uneven idle, white smoke and later it flooded cylinder 4 with fuel, disabling the spark plug and allowing raw fuel to flow into the exhaust system.
I thought it was the injectors but after changing them (I even changed the ignition coils) but there was no change, what could the problem be?
I thought it was the injectors but after changing them (I even changed the ignition coils) but there was no change, what could the problem be?
Asked on 8 April 2013 by Mhlekazi
Answered by
Alan Ross
Well, firstly check the crankcase breather pipe to see if it is corroded (a known fault). Then also the air filter.
Then check the following.
1.Air intake/vacuum system for any leaks
2.EGR valve/position sensor
3.TP ( throttle position sensor)
4.ECT ( engine coolant temp sensor)
5.MAF ( mass air flow sensor)
6.MAP ( manifold absolute pressure sensor)
7.ECU.
Do you have a working OBD port fitted to the car? If so then a diagnostic may actually show up what the fault is by code, otherwise you will have to check each item separately.
Note that white smoke normally indicates that the fuel being injected into the cylinder is not burning correctly (smoke will burn your eyes).
Although quite a long list , these checks should identify the problem.
Then check the following.
1.Air intake/vacuum system for any leaks
2.EGR valve/position sensor
3.TP ( throttle position sensor)
4.ECT ( engine coolant temp sensor)
5.MAF ( mass air flow sensor)
6.MAP ( manifold absolute pressure sensor)
7.ECU.
Do you have a working OBD port fitted to the car? If so then a diagnostic may actually show up what the fault is by code, otherwise you will have to check each item separately.
Note that white smoke normally indicates that the fuel being injected into the cylinder is not burning correctly (smoke will burn your eyes).
Although quite a long list , these checks should identify the problem.
Looking for a garage you can trust? Honest John's Good Garage Guide has thousands of reader recommended garages, plus how-to guides and tips on servicing.
The Good Garage GuideSimilar questions
Recently, the fan belt, tensioner and battery light came on in my 2004 Ford Mondeo. I had belt and tensioner replaced, but battery light still. I checked the battery voltage for charging, with the engine...
The engine of my Peugeot 306 my will suddenly cut out for about five seconds when I drive it 20 kilometres. So far, I've changed the petrol high pressure pump and the ignition coil but the problem is still...
I have a problem with the clutch pedal on my 2004 Ford Focus 1.8 TDCi staying on the floor occasionally, causing no disengagement of the gears. I lift the pedal up with my foot and clutch works again,...
.jpg)
