I have an audi a4 1996 1.8 and i have had bad idle from the start of having it like it doesent start unless i put foot on accelarator, so i replaced the maf(mass air flow sensor) Its a grey thing over a pipe in the car.
Right now it replaced i still have bad idle but no i also getting a lot of white smoke out of the back, the car seem to be like 10x more responsive and it does seem to keep the idle better while driveing.
Do you think my car needs something else fixing or maybe should i just buy loads of cleaning solution and put that in petrol and hope that help?
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Re: White Smoke out my exhause,
Hello chris first thing you need to do is while the car is running go to the rear of your car have somone increase the gas pedal to get it to smoke now smell the smoke does it smell like antifreeze if it does most likely headgasket going wich means your head needs to be pulled to change the gasket if it smells like oil possible valve seals clogged oil returns this is all serviced under your valve cover if car is turbo turbo seal internal most likely ruptured and is letting oil get into the exhaust port side have your turbo checked if there is wettness around the housing areallook for exsesive oil leaking externally goodluck please rate
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Typically bad rings, burning oil... when warms, metal expands, and seals better... check pcv system first, its cheaper, but generally will smoke at all times when bad... valve stem oil seals another posibility
difficult to diagnose ,would need to put a pressure tester on radiator and see what happens as white smoke is water vapour,unless its diesel as people often describe white smoke buts its a light grey which is fuel ,although the question does say TDI so am i to assume its a diesel turbo injection ,if it is then to think some more i would need to know if it has an injector pump or if its common rail .because you can have two completely different answers
audi oil leaks are usually valve cover gaskets. oil run off causes smoke on exhaust downpipes.while vacuum hoses do tend to dry rot with time it may also be the secondary air injection pump (if cold ) or waste gate for turbo.try to use a long hose,put one end on your ear use the other to locate sound. extending mirror and light may help too. missing at idle could mean time for tune up or coil pack failing. good luck
Engine also smokes when car driving if turbocharger still faulty. Did you change the engine timing belt (the timing belt kit) meantime? What about engine oil consumption? When engine glow plugs (one or more) burnt then engine exhausts white smoke at idling. Also white smoke at engine idling when water is still present in diesel fuel.
Sometimes diesel engines will put out black smoke under extreme acceleration. Other than that, they shouldn't smoke. Black is excess fuel, White smoke is water and bluish is oil. White smoke on a cool morning is not necessarily a sign of a problem unless it happens every time you start it through a warm day. Hope this helps.
white smoke on morning start up is normal once it clears up, how ever if it si constant and heavy it means coolant is entering the cyninders .wich means you may have a blown head gasket around a water port also check head for cracks
If your engine is not misfiring but it vibrates too much while idling your motor mounts might be getting worn out. I had a Nissan with bad motor mounts. I was ok in park but when you put it in gear it vibrated a lot. It smoothed right out as soon as you started moving.
The MAF has been a source of trouble for Audi such that the cost of replacement was halved a few years ago.
I am not sure why replacing the MAF would produce white smoke - white smoke being symptomatic of steam from water or coolant ingress into the cylinders or extreme amounts of fuel entering the cylinders. The latter is almost exclusively a diesel problem.
Generally if the MAF is suspected of being the cause of rough running then disconnecting it will cause the engine management to switch to the get-you-home programme. If the engine runs better the MAF is probably faulty..
As a matter of interest, it is necessary when changing parts on Audi that only the correct parts are used. Not only must they look right and be intended for that year and model but the part numbers should also be correct. A couple of digits out isn't close enough...
I am not sure where the idle thingy is on your Audi - the earlier models used a throttle body with the idle/throttle sensor and idle control all integrated in one very expensive lump and that is how I discovered the importance of correct part numbers.
In order to save my customer from scrapping what was otherwise a good car, I took a can-opener to the throttle body and opened it and found two broken wires and mananged to repair them. I needed to do some tricky welding to put it back together. The car went on for another seven years afterwards...
The car made no white smoke prior to the repair but the idle was very erratic...