Problem with 2002 Bora 2 Litre

[Jmac]

If they do throw codes they generally are lambda related and that prompts the inexperienced to fit a Probe. Yeah these do go but you must read what it is doing. Funny but nowadays if the computer throws no codes then no problem???????? There still IS a problem and the basics get missed like the humble spark plug( im sure most of you would agree ) scanner can trap you if you dont look outside the square. Im talking from experience LOL!! To answer you MAF Q? H100W is 100% right the ecu defaults but its only a default map and wont run at optimum. There is a spot in VAG COm where you can read the intake % and match it to a KW output and that also gives you an idea that you have a MAF Fault. Another notorious sensor on these is the Brake pedal switch. When pressed it switches the fuel off. When faulty also does the same , And sometimes doesnt throw a code, but again you can do a function test on this item with VAGCOM
Good luck!

[TaRkY]

Well, this is the story so far..

Disconnected the MAF. Drove around locally for 5K to try and reproduce the problem. When slowing down to take the first left hand turn the car stalled. Re-started it, and returned back home. Again when slowing down to a stop, car stalled. Didn't experience any of the "engine-shuddering" of my initial post (but again remember that the problem appears intermittently).

Re-connected MAF. Following the same route as above. Within minutes re-produced the "engine-shuddering" problem driving casually at 70K. Had to let go of the accelerator for a second and push down again to get it to accelerate.. However, when coming to the left hand turn again, car didnt stall and idling was smooth. Returned back home.

Disconnected MAF again. Again had trouble re-producing the "engine shuddering". Car didn't stall this time when taking first left hand turn but did when returning back to home.

For now, I'll continue to drive it with the MAF connected. Can't afford the car to stall - especially since I noticed that it affects the power steering severely.

My next step is as follows. After reading numerous threads online, I'm going to try and clean the MAF (very carefully). I assume SuperCheap Auto will have an Airflow cleaner? Or alternatively I can use Carburettor cleaner?

I'll probably continue to test the car in local surroundings without the MAF connected to make sure the "engine-shuddering" does not occur.

Thanks for all your help again. I'll keep you informed.

[Jmac]

My opinion is not to clean it but thats me mate. I never interfere with it from passed experience. As i mentioned it might still be operating above its parameters just enough not to bring a light on. Your man with Vag Com should read what the MAF is doing when you drive. Have him in the Pass seat while you drive. You Fully Accelerate in 2nd and read. I recently had an Audi that would shudder with the old MAF and cut out when disconnected. I went on holiday to the UK and brought 1 back with me and stuck it in for the guy and its been great since. My next suggestion would be to ask a good friend to borrow theirs for a quick roadtest and that would then rul it out as cleaning it out might not help. Ive had some drama with these i can tell you, and dont fall into the trap of buying the cheap crap on ebay. My Audi fella did just that and he ended up binning it!
Good luck mate.

[gpk_gti]

sounds like your maf mate,try to swap it with a car that is the same as yours,thats what I did the second time around and thats how I deducted that the new maf was also stuffed.