[928uk] RE: New to the game....

[Richard Armstrong]

>>From David, 928GTS auto. 70k.km, Oslo

>*      What is this MAF you are all getting excited about .... How do I
>know when I need mine seeing to also ?
>
Mass Air Flow sensor. Bosch hot wire device that senses the amount of 
air going into the plenum (throttle position etc) and passes the 
information in the form of a voltage into the engine ECU. After a time 
(100k+ or lots of short runs /stopping and starting usually) the 
platinum wire becomes eroded and the unit goes out of calibration - duff 
info into computer and the engine loses power and runs slightly roughly. 
Some times difficult to diagnose, the best way is to get it to JDS for 
checking, as it is easy to remove.


>*      Cooling fans discussions - I noticed last night that only one of
>the two fans came on at idle after a fast run - is this correct ? (temp.
>gauge is normal - no warning of overheating or high temp.)

2nd fan will only come on if the temp is high, as your temp is normal 
there should be no problem.
>
>*      I am about to change the wipers, and would like to maximise
>their sweep - can the 'next-up' size be fitted to the fronts (rear looks
>as if it can take +5cm top/bottom increase).
>
Dunno . Try it!
>*      Am ordering a new cam belt (yes thanks,  plus water pump ! ) -
>is there only one belt type/supplier ?  Do I also need to replace
>tensioners/pullies - (note low km. car) ?
Its worth stripping and rebuilding the tensioner when you have the rest 
apart.
>
>*      Warning about tension building up in the prop. Shaft on
>automatics - is there any warning/check I can perform ?

Go under car, drop the exhaust from the downpipes (you pretty well have 
to do this on Cat cars, remove inspection plate on housing behind 
flywheel and the flexplate is visible. Check with straight edge, if it 
is concave it is applying pressure to the crank.
>
>*      Rev. Counter wavers a bit at tickover - is this symptomatic of
>anything amiss ?
>
Is the engine wavering - if so it could be loads of things, MAF for 
instance. I had a wavering problem on my '91 S4 and it would 
occasionally just stop. This turned out to be a dirty connector on the 
engine temp sender (front right, sends identical signals to both 
ignition and fuel computers

>*      Fluid weeping from front LHS under the steering pump area - is
>there a well known probale cause (before I strip the tray off and have a
>look around)
>
The hose underneath the pump tends to weep and drips down. If you are 
not too worried about the puddle on the floor, and you check the level 
occasionally, it's probably not worth bothering about.
(wait for the flaming on that one!)
Make sure the oil is not coming from the rack though.

Richard
>Thanks again for any help/advice.
>David.

>
>
>
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