Hi, recently noticed that my Alpha Romeo 156 (petrol) was producing too much (white) smoke from the exhaust but did not think too much about it. Whilst driving the 'motor control system failure' switched on and I quickly pulled over and stopped the car. I switched the car back on and the 'sytems check' declared the car OK. So I proceeded to make my way back home, but when changing gears I realised that the car lost a bit of strength in acceleration between gears (almost as if it wanted to choke out) and at this point the warning light came on again. I stopped the car once more, but this time the lights remained on after I started it once more. What worries me is that I serviced the car only a week before this happened. Any help would be great.
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Re: Motor control system failure
It does not sound like a head gasket and it is not likely to be the ECU. It is more likely electrical: 1st Check the battery - Variations in voltage really upset the Alfas 2nd Electrical - most likely candidates are ignition coils; stressed wiring; or Lambda sensors. Finding a reputable mechanic that can correctly identify the issue is the biggest challenge otherwise it can cost $ in trouble shooting.
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White smoke would be very unusual, it would usually be steam rather than smoke. If I'm right, then it will be dissipating very quickly unless it's in freezing temperatures?
To get white smoke AND the smell of petrol best guess is that it's a cracked cylinder head or head gasket allowing coolant into the cylinder, the leak is so bad that the cylinder is unable to fire so the raw fuel from that cylinder is being pushed out the exhaust, along with the water (steam).
An accompanying symptom would be running rough/chugging, most noticeable at lower revs. If you drive the car like this then you'll quickly damage the catalytic converters in your exhaust so don't!
White smoke is caused by engine coolant / antifreeze being processed in the combustion chamber(s) of the engine
Keep in mind that, on a cold day you may see what appears to be white smoke from the exhaust that will disappear after the vehicles engine has warmed up to it's normal operating temp.. This is a normal reaction called condensation... condensation is the result of a small amount of water/dew being drawn into the exhaust usually collecting in the muffler and/or the catalytic converter.
an air leak would weaken the mix of fuel to air so giving you better fuel efficiency but a poor power output.
was my last answer not to your liking, re **** fuel consumption on all fiat/alpha cars.but it is true, ask any owner........14.7 average mpg.......£205 road tax.....(tax it for a year and quadruple its value...)
rev the engine over 3 4000 rpm and look in the expansion botlles for clear aer bubles if yes head gasket is gone my one was and water missing inexplicable yes is going in the cilinders or oil sump chek dipstik for white foam or very steamy waterish exhaust in the bak of the car
I Think it's just conincidance. Sainsburys fuel is checked independantly by Trading Standards and a private company. Both turn up unanounced. Plus there is a warning in the stations if water etc. is found. This shuts of the fuel from that tank.
White smoke usually occurs when there is not enough heat to burn the
fuel. The unburned fuel particles go out the tailpipe and typically
produce a rich fuel smell. It's not unusual to see white smoke in the
exhaust during cold weather until the engine warms up.
Faulty glow plugs or control module can cause white smoke on engine start up.
Low engine cranking speed may also produce white smoke.
white smoke is still visible after the engine has warmed up, the engine
may have one or more bad injectors, retarded injection timing or a worn
Low compression or air in the fuel system can also be a source of white smoke.