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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he causes of white exhaust smoke can vary; however, it is common to see white exhaust smoke when first starting a car, especially on cooler days. This is generally steam caused by condensation. As the engine warms up and the condensation dissipates the white exhaust smoke (steam) is no longer seen. If excessive white exhaust smoke is present well after the engine warms up, it is necessary to have the car inspected for possible internal coolant leaks. Indicators of an internal coolant leak include billowing white exhaust smoke accompanied by a sweet odor or a low coolant reservoir level. An internal coolant leak can also contaminate the engine oil giving it a frothy, milky appearance. Even small amounts of coolant entering the combustion chamber will produce white exhaust smoke.
One of the main causes of white exhaust smoke and coolant loss is a cracked or warped cylinder head, a cracked engine block, or head gasket failure caused by overheating. A cracked head may allow coolant to leak into one or more cylinders or into the combustion chamber of the engine. Dirty coolant, a poorly maintained cooling system, a low coolant level, or a non-functioning cooling fan can cause engine overheating. In addition, engine wear can eventually cause the gaskets to lose their capacity to seal properly allowing internal coolant loss. Intake manifold gasket and head gasket failures are two of the most common sources of internal coolant loss caused by engine wear.
Never remove the radiator cap or coolant reservoir cap while the engine is hot or running as it can cause serious injury; always allow the car to cool down completely first. Checking for a low coolant level in the reservoir is the first step in determining if coolant loss is causing the white exhaust smoke. If the coolant reservoir is at the proper level but excessive white exhaust smoke is present, a cooling system pressure check is required to determine where, if any, coolant leaks are located.
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.
Well, your control center is telling you, you have a problem, You drive an Alfa Romeo, it say's I have a problem and you don't take it in for repair??? You have a sensor going bad, so either buy a repair manual, a scanner and tolls to fix it or take it to a dealer and have it fixed.
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.