harj Posted October 24, 2006 Report Share Posted October 24, 2006 I cant believe this, the S3 was running all smooth and fine for TWO days after changing the MAF and the jerks have come back. Its weird as they're not as aggresive now. It's happening when i lift off the throttle mostly. I change gear bulid up speed and as i ease of the throttle it'll jerk!!. I thought the MAF was the problem but its something else. Could it be something to do with the accelerator, is there a sensor that could malfunction down there worth taking a look at? Any other possibilities now that the MAF is out of the question Link to comment Share on other sites More sharing options...
Ska Posted October 24, 2006 Report Share Posted October 24, 2006 Coil packs does it sound like mis firing and have you got any fault codes from it? My 8 was doing this a while ago and turned out to be a dud ignition lead; does it jerk when going up hill on slight pedal pressure as well? I think I may have seen you out and about in my nick of the woods Link to comment Share on other sites More sharing options...
slol Posted October 24, 2006 Report Share Posted October 24, 2006 Do you have acess to vag com,if so try doing a throttle body reset,in any case i would disconnect the battery for about 1hr so the ecu can start afresh and relearn the engine values,if your previous maf was faulty then the engine adapts to it. Throttle body reset Link to comment Share on other sites More sharing options...
Tobes49 Posted October 25, 2006 Report Share Posted October 25, 2006 [ QUOTE ] Do you have acess to vag com,if so try doing a throttle body reset,in any case i would disconnect the battery for about 1hr so the ecu can start afresh and relearn the engine values,if your previous maf was faulty then the engine adapts to it. Throttle body reset [/ QUOTE ] If you want to reset learnt values then save adaption channel 00 in the engine, save a hour with the battery disconnected. Link to comment Share on other sites More sharing options...
Tobes49 Posted October 25, 2006 Report Share Posted October 25, 2006 [ QUOTE ] I cant believe this, the S3 was running all smooth and fine for TWO days after changing the MAF and the jerks have come back. Its weird as they're not as aggresive now. It's happening when i lift off the throttle mostly. I change gear bulid up speed and as i ease of the throttle it'll jerk!!. I thought the MAF was the problem but its something else. Could it be something to do with the accelerator, is there a sensor that could malfunction down there worth taking a look at? Any other possibilities now that the MAF is out of the question [/ QUOTE ] Can you comfirm some things, You accelarate away, as you lift the throttle slightly the car jurks, Like you took the throttle off and on quickly? Just the 1 or does it carry on doing it? Link to comment Share on other sites More sharing options...
Mo-S3 Posted October 25, 2006 Report Share Posted October 25, 2006 Have you cleaned the throttle body ? Usually gets a bit gunky in there and can cause the butterfly to get a bit sticky Link to comment Share on other sites More sharing options...
harj Posted October 29, 2006 Author Report Share Posted October 29, 2006 [ QUOTE ] Coil packs does it sound like mis firing and have you got any fault codes from it? My 8 was doing this a while ago and turned out to be a dud ignition lead; does it jerk when going up hill on slight pedal pressure as well? I think I may have seen you out and about in my nick of the woods [/ QUOTE ] Sorry for the late response guys, been off work Anyway, Yes it does exactly what you've wrote. However i've noticed that its doing it less frequently now. I haven't felt it jerk for the last coupem of days now. Could this be the ECU learning new air flow settings? Link to comment Share on other sites More sharing options...
harj Posted October 29, 2006 Author Report Share Posted October 29, 2006 [ QUOTE ] [ QUOTE ] I cant believe this, the S3 was running all smooth and fine for TWO days after changing the MAF and the jerks have come back. Its weird as they're not as aggresive now. It's happening when i lift off the throttle mostly. I change gear bulid up speed and as i ease of the throttle it'll jerk!!. I thought the MAF was the problem but its something else. Could it be something to do with the accelerator, is there a sensor that could malfunction down there worth taking a look at? Any other possibilities now that the MAF is out of the question [/ QUOTE ] Can you comfirm some things, You accelarate away, as you lift the throttle slightly the car jurks, Like you took the throttle off and on quickly? Just the 1 or does it carry on doing it? [/ QUOTE ] Correct, it used to jerk a few times but since i changed the MAF it jerked once when it happened and for the last couple of days it hasn' jerked at all Link to comment Share on other sites More sharing options...
Ska Posted October 29, 2006 Report Share Posted October 29, 2006 Does it get progressively worse as the car warms up? Knackered coil pack/leads tend to get worse in extreme conditions i.e. very wet or hot weather; we've had niether in west London over the last couple of days I would have thought the ECU learned what has to learn over the space of a few mins rather than days Link to comment Share on other sites More sharing options...
harj Posted October 30, 2006 Author Report Share Posted October 30, 2006 [ QUOTE ] Does it get progressively worse as the car warms up? [/ QUOTE ] It actually gets better when its warm. Today it jerked a few times when it's cold but its not bad when the engine is warm. As i started moving uphill it started jerking again Link to comment Share on other sites More sharing options...
Ska Posted October 30, 2006 Report Share Posted October 30, 2006 Hmm... My car used to do the uphill bit but only on light pedal depression; if you were going up hill and were simply cruising along it would shudder and jerk but if then put the pedal to the metal so to speak then it would accelerate smoothly. Get a visual of your coil pack ends and lead sections and look for any deterioration and arcing blast patterns on the ends. Here's the link to my symptoms TSN A8 judder it was diagnosed from being every thing but the Ignition lead. Where are you based in west London? perhaps a quick look might help I saw a car that looked the same as yours in hammersmith last week was it yours? BTW does it only jerk in gear i.e. revs freely in neutral? Link to comment Share on other sites More sharing options...
Tobes49 Posted October 30, 2006 Report Share Posted October 30, 2006 Ska his car wont have plug leads, He has 4 seperate coils that run directly on each spark plug. You said it jurking up hill today, is this without letting of the throttle? Just it makes a major difference if you didn't let of the throttle. Link to comment Share on other sites More sharing options...
harj Posted October 31, 2006 Author Report Share Posted October 31, 2006 [ QUOTE ] Where are you based in west London? perhaps a quick look might help I saw a car that looked the same as yours in hammersmith last week was it yours? BTW does it only jerk in gear i.e. revs freely in neutral? [/ QUOTE ] Yes i was in Hammersmith last week, so you could have seen me. Yes the judder only occurs whilst in gear and revs freely in neutral I had the coil packs chnaged a while back when they packed up so it would be strange if they were the issue Link to comment Share on other sites More sharing options...
harj Posted October 31, 2006 Author Report Share Posted October 31, 2006 [ QUOTE ] You said it jurking up hill today, is this without letting of the throttle? Just it makes a major difference if you didn't let of the throttle. [/ QUOTE ] Yes i only eased off the throttle until the car started to jerk going uphill, then i depressed the throttle it jerked a bit more then was smooth. This mornig it jerked when the engine was cold but then was as good as new when warm This is driving me mad What a fekin riddle Link to comment Share on other sites More sharing options...
Ska Posted October 31, 2006 Report Share Posted October 31, 2006 @ Tobes, I was aware of that but was thinking about the fact that either the coil pack itself has gone bad or the stalk/tubing bit on the end has perished causing arcing to that end the sparkplugs could be duds, or the wiring to the coil pack has been damaged, could that not be a likely cause? @ Harj; you weren’t parked on the ground floor of certain multi story Car park were you if so I was parked 20ft away from you The symptoms of the jerking under load are so reminiscent of what I experienced Link to comment Share on other sites More sharing options...
Tobes49 Posted October 31, 2006 Report Share Posted October 31, 2006 Think it will need to have scan done on the engine ECU. there so many things it could be. Link to comment Share on other sites More sharing options...
harj Posted October 31, 2006 Author Report Share Posted October 31, 2006 [ QUOTE ] Think it will need to have scan done on the engine ECU. there so many things it could be. [/ QUOTE ] Would a specialist be able to take care of that? Link to comment Share on other sites More sharing options...
harj Posted October 31, 2006 Author Report Share Posted October 31, 2006 [quote @ Harj; you weren’t parked on the ground floor of certain multi story Car park were you if so I was parked 20ft away from you [/ QUOTE ] Nope that wasn't me mate Link to comment Share on other sites More sharing options...
Tobes49 Posted November 1, 2006 Report Share Posted November 1, 2006 [ QUOTE ] [ QUOTE ] Think it will need to have scan done on the engine ECU. there so many things it could be. [/ QUOTE ] Would a specialist be able to take care of that? [/ QUOTE ] Yep, or find someone in the VAG-COM section Link to comment Share on other sites More sharing options...
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