PhilRS Posted April 23, 2005 Report Share Posted April 23, 2005 I had a similar problem on my '96 4.2 quattro. It was fixed when the ECU was checked by an independent specialist. Some connexions had gone "dry", causing the pbm. No pbm since then (18 months ago). In my case, the car would run well when cold, then it would start to have these low rpms jerks when hot, as if it wanted to regurgitate its engine! Link to comment Share on other sites More sharing options...
Ska Posted April 28, 2005 Author Report Share Posted April 28, 2005 Ok the new throttle body and coil pack have turned up from VAGparts and I'm going to fit them tonight together with a new set of super 4's. But will I notice an immediate change or will the fault code need to be reset after fitting the throttle body? i.e. will the symptoms clear up upon installation of the new throttle body even if the fault code is still stored in the ECU? And, and also I’ve been told various things about adoption procedures for the TB some include the use of VAGcom and the others just disconnect the battery for a few minutes? What’s the correct way? cheers Link to comment Share on other sites More sharing options...
Ska Posted April 30, 2005 Author Report Share Posted April 30, 2005 Where's the gremlin for when the hits the fan: Cos that’s the situation at where I find myself at tonight. Having changed the TB I took the car to AMD in Bicester to get the fault codes reset and the adaption done. When I got there the folks were only too happy help they brought out the VAS and checked the engine, but guess what it won't let it set the adaption and comes up with the error message. We thought it may have something to do with the aftermarket stereo so I removed it and it cleared the fault but still wouldn't allow for the adaption, subsequently we took it for a spin and the guys reckoned it was the Gear box that was doing the jerking so in went VAS again to check the TCU guess what no body home the TCU wasn't talking though there were no fault codes on the engine . Anyway bottom line is I've still got the hesitancy and misfire and the diagnostic tools can’t communicate with the TCU. The guys had a quick look to see if there were any dry joints on the ECU’s but none. What bugs me is if the jerkiness is caused by the bleeding gearbox how is it responsible for the misfires? Cruised back from AMD at around 90mph no probs, got home pulled apart the ECU box and found that though the actual ECU boxes didn't have any green water corrosion there were a couple of connectors in there which had a few pins covered in the green powdery stuff, what do I clean it with? Dare I ask could something as small as this be the cause? What are these connectors especially the yellow and blue one? I've ordered a set of ignition leads as well and I think this is all I can do myself; according to AMD the cost to repair the loss of com. to the ECU plus a new ECU and exchange G/box is around £4000 Link to comment Share on other sites More sharing options...
cruiser647 Posted April 30, 2005 Report Share Posted April 30, 2005 For connectors like those, I use WD-40. However, any electrical contact spray will be good. I have sprayed all my connectors on my current 30 valve V6. Did so too, with my old V8 (when my heater matrix leaked over the connectors) and most handy connectors in the A8 4.2. Helps a lot, especially when there is green stuff on the connectors. I think it means a bit of damp has got in. Well found! Link to comment Share on other sites More sharing options...
Ska Posted May 1, 2005 Author Report Share Posted May 1, 2005 OK cleaned the ECU connectors, didn't make a difference. But now I cleaned the MAF sensor or at least I think I did. The car is better still jerks but not as violent and as often and the misfire is even rarer. Aside from alcohol can you use electrical contact cleaner on the MAF sensor and is the actual sensor two resistor type things inside the tube? Can the phillips screws at the back of the sensor be removed to remove the plate so I can get a better look at it? I tried but it seemed to be lock tight? Link to comment Share on other sites More sharing options...
Ska Posted May 1, 2005 Author Report Share Posted May 1, 2005 WOHOOO! YEEHAAA! and so forth. I've fixed it and you are not gonna believe what it was... after changing the coil pack, spark plugs, throttle body, cleaning the ECU box contents and the MAF sensor, it turns out to be a dud ignition lead Doh! The contact on number 3 cylinder lead was shot and the spark was leaking to ground. Put a temp lead for now until wednesday; Damn the car feels like new, reponsive and nimble with the correct gear chages with the appropriate levels of throttle! OK now the moaning bit; why the shmuck do we pay the stealer £116 just for them to plug a harness into our cars and read a VAS screen. You'd think they would check the obvious things like plugs and leads for that sort of diagnostic money. All I got for £116 is throttle body faulty I asked whether that would fix the problem and they said maybe and its a start! What the shmuck Any how I now know alot more about my 8 as a result and have returned from the brink of selling it with all the diagnostics horror stories about it being the gearbox and costing £4500 to fix and the only ones to come through were the TSN massive with all its knowledge database. As soon as I've taken collection of the VAGcom software you boys are welcome to diagnose your cars anytime thanks guys I've got a lump in my throat Link to comment Share on other sites More sharing options...
cruiser647 Posted May 1, 2005 Report Share Posted May 1, 2005 Well done Mate! 1 poxy cable caused so much grief! At least your car feels completely better now, what with all you have done and changed. Good work. Link to comment Share on other sites More sharing options...
Botang Posted May 1, 2005 Report Share Posted May 1, 2005 I'm pleased for you Ska, it must be great to have it driving correctly again, I think some credit has to go to Tobes49, wasnt that the very first thing he suggested? Just out of curiosity when AMD were checking the TCU was the car running? Does this mean youll be coming along to the MK meet on Wednesday, o on you know you wanna Link to comment Share on other sites More sharing options...
Ska Posted May 1, 2005 Author Report Share Posted May 1, 2005 Thanks guys, your right I bought my car before I knew of TSN but now I don't know what I'd do without it, and folks like tobes and tomk and the 8 squad; its a damn sight better for trouble shooting probs than the stealer. I'm hoping to get down to meet soon work permitting; from tuesday I'm running back and forth from Manchester and Filton AMD tried communicating with the TCU when the car was stationary (ignition on) and moving but no joy. They did use the old version of VAS ( a sort of blue mini laptop that would look at home in a nursery) it wasn't the 1551. Link to comment Share on other sites More sharing options...
ng_lag Posted January 1, 2006 Report Share Posted January 1, 2006 Hi all, I have recently purchased my first A8, and have been reading these pages with great interest. In particular, my car is showing identical symptoms to the original post above (hesitant and jerky between about 1400rpm and 1900rpm). I took the car to an Audi main dealer, described the problem and took a technician for a test drive to demonstrate the problem. I mentioned that the HT leads could be the root cause of the problem, and left the car with them to investigate. They later phoned to confirm that they thought there was an issue with the leads (arcing to the rocker cover?) and consequently changed all the leads and spark plugs. They then test drove the car again, but phoned to say they were not 100% happy that it was totally fixed (although they could not find any other faults registering). They asked for the car to be collected and for me to drive it and report if/ when I saw the problem again. However, when I took the car back, it was exactly the same - no noticable change/ improvement, and I was seveal hundreds of £££ lighter !!! Any ideas? Link to comment Share on other sites More sharing options...
SneakyMcC Posted January 1, 2006 Report Share Posted January 1, 2006 Yes, take it back and ask for your money back if they said that the leads were the prob. But if they were going on what you said, then you've done your money. This is a major thorn in my side with garages. They quote to fix summit, you pay in good faith and leave and the problem has not been addressed at all! Yeah its one of my pet hates! Er... Sorry ng_lag. Welcome to TSN. I do hope your new acquisition aint one of the cars you've read about on here!! Link to comment Share on other sites More sharing options...
ng_lag Posted January 1, 2006 Report Share Posted January 1, 2006 Thanks for the quick reply. Basically I left them to diagnose the fault - gave some suggestions based on the posts above, but they had the car for two days in total to find/ fix it. I can see no change at all, so it looks like a return visit is in order!! Link to comment Share on other sites More sharing options...
Ska Posted January 2, 2006 Author Report Share Posted January 2, 2006 Yeah Welcome M8 But what model do you have mines the V6 30v which has the cluster of coilpacks at the front of the engine bay feeding each cylinder with spark via HT leads. It may also be a dud coil pack or spark plug or quite simply a vacuum leak (I changed the lot but found the problem was the lead on bank one cylinder three because theres a lot of heat build up there). When the stealer done the work did he not tell you of any fault codes that came up with the car? Link to comment Share on other sites More sharing options...
SneakyMcC Posted January 2, 2006 Report Share Posted January 2, 2006 ng_lag. Take it back and give them a letter asking them the specific question "did their work cure the fault?". Be nice, and continue to ask what they intend to do about it. They were contracted to fix a fault, you paid what they asked for, but have not received the repair. Ask them if their staff diagnosed the fault correctly? I'd ask them to fax a copy to A8 customer support @ Audi UK on your behalf. This will prolly get you no where, but this is what I shall be doing in future to stealers when they take money for their mistakes. I've had £115 chq from one stealer for this and parts totalling £170 from 2 other stealers for the same. Until we all start to make a stand, we'll all continue to get . (can we have some rousing patriotic music now please? ) Edit: Ps, not to mention the £460 labour when a stealer damaged summit (I paid the 140 parts, but there were mitigating circumstances) Link to comment Share on other sites More sharing options...
SneakyMcC Posted January 2, 2006 Report Share Posted January 2, 2006 Oh yeah, and you could ask how they'd feel if you didn't stick to your end of the contract (never paid the bill)! Go on, you know it makes sense. Then give them a chance to sort you out and then if they dont, post who they are and I for one will write to their parent company and ask if the matter has been resolved (let'em know we're ) Link to comment Share on other sites More sharing options...
ng_lag Posted January 2, 2006 Report Share Posted January 2, 2006 Thanks guys The car I've got is a 2002 2.8QS. When I picked up the car from the garage, the person I spoke to (not the technician) said that they had not found any other faults. I think I'll get that confirmed, and find out exactly what tests, etc. that they did. They have changed the leads and spark plugs (as they said they found the arcing problem), so maybe the coils are the next thing to look more closely at??? Anyway, based on your replies/ help, I will be heading their way tomrorrow to ask them a few awkward questions (particularly about charging me for work that did not fix the problem) and to find out what they intend to do next!!!! I'll let you know how I get on. Thanks for your support to my first posting - great forum! Link to comment Share on other sites More sharing options...
SneakyMcC Posted January 3, 2006 Report Share Posted January 3, 2006 Good luck wi'that! Ask for the old stuff back too (they'll prolly say they've binned it) Link to comment Share on other sites More sharing options...
Ska Posted January 3, 2006 Author Report Share Posted January 3, 2006 I'd have a look at the lead they changed as well; ask them which one it was and see whether they tried to just clean it up or did they replace it- it needs to be replaced; look at the end of the lead to see the blast patterns on the end. Link to comment Share on other sites More sharing options...
ng_lag Posted January 3, 2006 Report Share Posted January 3, 2006 Spoke to them briefly on the phone today to let them know their work had not fixed the problem and was not over impressed with a £££ invoice and no fix. They have agreed to take the car back again next week to investigate again. The last invoice showed 3x cables, 3x leads and 6x spark plugs and states that they have been replaced, but I will check to confirm. I'll have to see what next week brings!! I'm sure there will be some interesting discussions when I go in to see them! Link to comment Share on other sites More sharing options...
Ska Posted January 3, 2006 Author Report Share Posted January 3, 2006 Err.. I'm gonna sound dense here but why have they got 3xcables and then 3xleads, why not just 6x leads or cables Link to comment Share on other sites More sharing options...
ng_lag Posted January 3, 2006 Report Share Posted January 3, 2006 I have to admit, I asked myself the same question this morning when I re-read the invoice (and assumed I was just being dense!). Not really sure..... I will have to call them tomorrow and find out unless anyone can shed any light on it? Link to comment Share on other sites More sharing options...
ng_lag Posted January 11, 2006 Report Share Posted January 11, 2006 Here's the answer to the "3x cables and 3x leads" question: they use the different name to distinguish between the left hand side and the right hand side of the engine, as apparently the leads required for each side are different??? Link to comment Share on other sites More sharing options...
Ska Posted January 11, 2006 Author Report Share Posted January 11, 2006 Different lengths; thats all, isn't it? Link to comment Share on other sites More sharing options...
ng_lag Posted January 12, 2006 Report Share Posted January 12, 2006 They just said they were "different", but you are probably right. I can't see any need for them to be different in any other way? Link to comment Share on other sites More sharing options...
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