Question about 1996 Audi A4

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White Smoke out my exhause,

HI Mate,

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?


Chris Johnson

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  • Squashman112 Oct 02, 2008

    Hi mate,

    Well no one in to press pedal at moment, but when i did it with my sister there she said it smelt like petrol.

    What i don't get say i now go put my old maf on i most likley won't get any white smoke.

    Also do you know where idle control sensor is i might replace that as it cuts out now, more with the new maf it cuts out when just slowing down.

    Is there a reason why a new maf would make it cut out more than the old 1 at least my old 1 use to keep it about cutting out point while driveing.



  • Squashman112 Oct 03, 2008

    Hi mate,

    Where is the tps sensor in my car maybe i could do a clean on that or unplug it see if it does anything differetn with no sensor.


    Chris Johnson



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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

Posted on Oct 02, 2008

  • Robert Morales Oct 02, 2008

    hello again chris maf sensor is for air intake into your throttle body make sure the connections are tight idle air control valve usally mounted on your throttle body by two star screws it looks like a small round motor take this out clean the bore where you took it out with a wire brush best one i use is a plumbers brush its round and works good in that area clean down with carb cleaner insert new iac motor give the computer a chance to extend the pintle out to the bore drive car over 35 mph so computer calibrates( throttle positioning sensor) tps sensor is also for your idle if you are getting erratic idle and surging up and down have it tested goodluck please rate

  • Robert Morales Oct 03, 2008

    hello chris tps isnt servicable some have a slot adjustment to increase idle thats it my friend its mounted on the side of your throttle body usually black plastic kind off shaped like a human ear its flat about 1/2 inch thick held on the throttle body by two star tool screws goodluck



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Update on my problem to audi a4 1.8 1996

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...

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