interesting....i changed the plugs last night, fired the car up, sounded exactly the same...so i started messing about with the 2 spare coils i have. replaced coil one, fired it up, didnt seem any different. Replaced coil 2, woah, all of a sudden is holding revs lovely!
i could still hear the odd pop every now and then so i took it out for a test drive, it was perfect in all ways.
still was this morning when i drove it. I am assuming the plugs made no difference as a lot of people have changed those, so it could be the coils starting to break down under certain conditions.
Now I have thought i have sorted it before so i am not saying definitively its the answer, but its definately fixed it in the short term.
i will stick a few miles on it and see how it progresses.
good news though eh?
makes me laugh that potentially 1 faulty coil had me with the engine out on the floor on my new car lol
will report back tomorrow to see if there is any change
correct me if i am wrong but the regulator on the alternator 'regulates' the voltage
I just noticed this same problem (or at least I think its the same thing) in my 2.0 TDI... I was about to post a thread about it when I saw this one right up at the top of the page. It only just started today though (I've had the car about 2 weeks now) and when it gets to around 2.5 K RPM it seems to drop the revs quite noticeably and then suddenly picks back up again after a second or two - basically it sounds as if I just put my foot on the clutch for a second. Is that the same thing that you guys are experiencing?
just had a mess about in the garage, vagcom'd the car and there were zero faults on it.
only thing that i found unusual was the voltage.
it sits at 11.8 when the engine is off, which is fairly normal i think. but when i fire it up it only lifts up to 13.5 volts. Is that right? every other car i have test sits around 14.5 volts.
That start making me think that maybe there is not enough current to provide a proper spark?
so i performed a little experiment, I have a mega battery charger with a boost facility that can provide enough starting power to turn a truck engine over. I put it in boost mode, fired the car up and rev'd it to just under 2k, or the best i could hold it. it was doing it bouncing about thing, then hit boost button, the volts went up to 15, the revs picked up straight away, without me moving my foot at all.
it did everytime on from idle to 2k.
voltage problem? i could have sworn you are supposed to have 14.5 volts on them engines ?
Checked my voltage on vagcom last night and on block 4 it shows the same voltage as your Ian, 13.5V ish.
Hi Chris, Not sure it can be related to our problem tbh, especially with yours being diesel. Our problem could be generic to the A3 , but I would think it would have to be common to the petrol variants.
Get yourself a vagcom scan done in the first instance and good luck with getting to the bottom of it.
Julian