A4 2.0TDI - Jerking when accelerating

[Toy Machine]

hmmmmmmmmm, i;ve literally had this problem for years and no solution, if it is something like this. I will be super pissed xD

 

[AceSwiftShooter]

hmmmmmmmmm, i;ve literally had this problem for years and no solution, if it is something like this. I will be super pissed xD

Lol well maybe it's that! It would only happen under heavyish acceleration, when the suction of air was enough to pull through the gap. With the MAF suddenly reading 0 air, it would jerk.

Sent from my ONEPLUS A6013 using Tapatalk

 

[Skalabala]

Why not get the car on live data diagnosing? You can not just replace parts if you do not have data to tell you to do so.
This frustrates me, mechanics throwing parts at a car.
Have you had a look at the gearbox? VW/Audi has a lot of problems there.
You might have a vacuum leak. But this will be seen by a mechanic that knows what he is doing while looking at live data.

 

[Gabushna]

Check EGR valve

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[solz]

I had similar issue with my Mazda3 a few years back. now mine ain't turbo charged or anything just standard 2l.
when you try accelerate it would do nothing then suddenly all power then nothing again. and this would be random.
the issue was caused by my alternator not working 100% so sometimes it would generate enough power to drive everything but every now and then it would "so to say wobble" and not generate enough power for all other electronics as most are not powered by the battery.
seems like mine was set to kill injectors the power steering and brakes would be the last to be killed off.

but then a year or so later had another issue but also caused stutter in the car. this was caused by a failing clutch, but at first there where no signs that it could be the clutch no slip or anything like that. but just one day it just started vibrating every time I used it to change gears and later noticed the vibrations also when you rest your foot on it.

but hay since those issues where resolved its been happy km's again...

 

[Sub-lime]

+1 to Panic Mechanic (Stephan van Tonder) he's well versed with these cars. He has personally worked on my turbo projects and sorted issues out.

 

[Supreme]

My money is on faulty piezoelectric injectors. Good luck

 

[Cxb3r]

Why not get the car on live data diagnosing? You can not just replace parts if you do not have data to tell you to do so.
This frustrates me, mechanics throwing parts at a car.
Have you had a look at the gearbox? VW/Audi has a lot of problems there.
You might have a vacuum leak. But this will be seen by a mechanic that knows what he is doing while looking at live data.

frustrates the hell out of me now ...

I did everything I can do, and still no luck,
also I did not buy parts without first doing some diagnostics,
Diagnostics reads nothing about anything important and I am not making it up
Reason I started to buy the parts is because the mechanics told me that this might solve it, then that might solve it and so on.
Even had the car at Audi in Welkom, and they can't even fix it.

Now every single mechanic or Audi fan boy, told me that with the TDI it's the injectors, I myself did not want to do it after 3 or 4 diagnostics tests done without it reading injector faults or any of the parts I replaced, but I did recon the injectors out of my own stupidity.

Yes live diagnosing I did a couple of times aswell.

No vacuum or air leaked on boost pipes, but gearbox seal I am going to do next.

 

[Cxb3r]

Check EGR valve

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Did clean it, and replaced with EGR Delete kit, and went back to EGR, still the same.

 

[Cxb3r]

My money is on faulty piezoelectric injectors. Good luck

Injectors Tested, Injectors were 100% fine on test but I Re-conned them by Diesel Bosch Welkom R3200 each R12800.00

I did it with the only place in Welkom that can do it, (also they are a certified Bosch) and they did told me before I paid for the reconn that I am going to waste my money as the tests showed it was 100% fine anyway, so I did not listing and am not going to pay R13000 for 1 at Goldwagen and yes after I paid them to fix the injectors, it was still not the injectors, not even the diagnostics picks up a faulty injector, and still doesn't pick it up.

 

[aeoniix]

I had an opel corsa which gave me this exact problem, I know it's completely different cars, but my issue was caused by a slightly worn crank pulley. less than 1mm play on the keyway, drove it like that for a few months because no one I took it too could find the problem. Saw it by chance when I redid the headgasket, replaced the pulley and made sure the key on the crankshaft didn't have any wear- and the problem was solved.

 

[Cxb3r]

I've had the same thing with my Mazda 6, it basically feels like it loses power immediately, and then 0.5 seconds later it gains all its power back. Like it is being forced into a choke point and then released all at once. It does this between 2-4000rpm and can do it any number of times between that range. Also started randomly one morning. The amount of petrol you apply from pull off influences how bad the jerks are - more the power overpowers the jerking and it is less of a choke. If you pull off slowly it can sometimes dip the entire nose of the car seriously as if you stall.

I think it is the MAF since if I disconnect mine, it goes away entirely. Also been to many mechanics with fokol solution. The only other thing I can think it is is that the sump has too much gunk in it and it somehow affecting it and has affected and built up into the engine itself somehow, as my Mazda NEVER used oil, one day it started using a fair amount, and the dipstick stopped reading the oil correctly entirely from that day, not even if you checked it in the morning after standing all night.

The sump makes sense

MAF Sensor I did replace and tested from a friend's Audi

The Sump with maybe gunk in it makes sense, will clean and change oil and check it, but not sure if that alone will solve anything really, but will try it.

 

[Cxb3r]

I had an opel corsa which gave me this exact problem, I know it's completely different cars, but my issue was caused by a slightly worn crank pulley. less than 1mm play on the keyway, drove it like that for a few months because no one I took it too could find the problem. Saw it by chance when I redid the headgasket, replaced the pulley and made sure the key on the crankshaft didn't have any wear- and the problem was solved.

With this problem I am having with the Audi, a lot of Corsa Stories I head seems similar to my problem.

Will check it.

 

[PostGhosties]

I’ve had this problem many times with my Audi. Its a coil

 

[Cxb3r]

+1 to Panic Mechanic (Stephan van Tonder) he's well versed with these cars. He has personally worked on my turbo projects and sorted issues out.

I can't drive car there, and to tow it not going to happen, wish I could as in Welkom no one can help me now.

 

[Cxb3r]

I’ve had this problem many times with my Audi. Its a coil

Wish mine was Petrol, unfortunately Diesels don't have coils as far as I understand.

 

[aeoniix]

With this problem I am having with the Audi, a lot of Corsa Stories I head seems similar to my problem.

Will check it.

There's a facebook page called OOC- opel owner's club. Mostly just guys bragging about opel being the best (pfffft), but there's a few amazing mechanics on that page, maybe one of them could give you a solution. One of them correctly diagnosed a problem on a friend's Ford Ranger the other day that not even Ford could sort out. IMO the car has cost you way too much to justify spending much more on it, audi parts are crazy expensive.

 

[Cxb3r]

Just a update.

Flashed ECU back to stock from a place in Welkom.

JF Auto in Welkom assisted again with Diagnostics and a custom pipe.

They did a full diagnostics again, without any luck.

Told me that the injectors might need to be calibrated in ? (Update Trim Files ?)
apparently on my model the BLB 8EC it is not needed and anyway no one can do it for me.

My question, Is it needed and who can do it ? ? ?

Also they said, it might be the injectors story again. even after I showed them the proof I did re-conned it from the place they are using (Diesel Electric Bosch Welkom) and they send me to do it there in the first place.

What they did find was a boost pipe from turbo side that previous owner maybe tried to seal as there was a leak and some sealer thing.

They custom build a boost pipe for me.
Now the boost is better, and car feels a bit faster.

Bought a rear main seal that I still need to fit, (Lockdown prevented me to do so) so I will do so when I can do so.


Still same story, and car still jerks if you accelerate (hard or slow) under +- 3000rpm , so I give up.

 

[Cxb3r]

There's a facebook page called OOC- opel owner's club. Mostly just guys bragging about opel being the best (pfffft), but there's a few amazing mechanics on that page, maybe one of them could give you a solution. One of them correctly diagnosed a problem on a friend's Ford Ranger the other day that not even Ford could sort out. IMO the car has cost you way too much to justify spending much more on it, audi parts are crazy expensive.

I will check out, but not worth it to spend more on the car, atm I am going to try and sell it back to WBC or trade it in on something else.

Only reason I started to spend on the car is I thought that it will be sorted by now.

 

[franco1s]

I will check out, but not worth it to spend more on the car, atm I am going to try and sell it back to WBC or trade it in on something else.

Only reason I started to spend on the car is I thought that it will be sorted by now.

is the car automatic?

 

[Cxb3r]

is the car automatic?

manual gearbox 6 speed

 

[Dannler]

Maybe your Pressure relieve valve on your high pressure side of the diesel system is leaking a just enough back tank to cause jerking under load?

My brother in law had a similar problem with a disco 3. Where the high pressure fuel pump pulley was worn out on the shaft. Low loads it would run fine, high loads it would act up. Not sure how the hp fuel system works on an audi

 

[Dannler]

You said you tested injectors ect. Them copper washers at bottom of injectors sealing on cylinder head. Have you changed them? Have you made sure that there is also just one in. You get a-holes that dont take the old ones out

 

[franco1s]

manual gearbox 6 speed

Rules out a faulty transmission control valve, read in the thread you had a part of your buddy to test on yours, think it was the maf, ask if he's willing to let you test some other parts, seeing no error codes via diagnosis it's a bit of a shot in the dark, like your cam and crank sensors etc fit them on his car and see if you can replicate the issue on his car, that's all i got, hope you get it sorted.

 

[Cxb3r]

Maybe your Pressure relieve valve on your high pressure side of the diesel system is leaking a just enough back tank to cause jerking under load?

My brother in law had a similar problem with a disco 3. Where the high pressure fuel pump pulley was worn out on the shaft. Low loads it would run fine, high loads it would act up. Not sure how the hp fuel system works on an Audi

Audi Welkom at Lindsay Saker, one of the Mechanic told me to buy the front Vacuum / Fuel Pump it is something to do with the high pressure fuel pump, when he replaced it for me privately, he did check the casket and the pulley the pump runs on, and to his knowledge pulley was still fine, gasket comes with new pump.

One at the beginning of the thread / Fuel / Vacuum Pump - Replaced / R25000 Audi / R4500 Goldwagen
Replaced it with Goldwagen one.

Now for the injectors, replaced the washers, and the rubbers (they sell it as a Kit), also new stretch bolts (Bought at Audi), was done at Bosch Diesel Centre State Auto Diesel these are the only guys that is certified with Bosch and does Diesel injectors in Welkom for all the Mechanics in Welkom, everyone told me to go there.


Pressure relief valve on my car, I am not sure if it is on the pump I replaced, but I am not sure where to look for it and even if I find it, I am not sure who will replace it, because at this moment, they all begin with the injector story.

 

[Cxb3r]

Rules out a faulty transmission control valve, read in the thread you had a part of your buddy to test on yours, think it was the maf, ask if he's willing to let you test some other parts, seeing no error codes via diagnosis it's a bit of a shot in the dark, like your cam and crank sensors etc fit them on his car and see if you can replicate the issue on his car, that's all i got, hope you get it sorted.

Did swap out parts, nothing really happens.

Cam sensor, speed control sensor was bought new and fit to the car with a hell of a mission, did not do anything.

 

[Dannler]

Go rant on twitter and facebook to audi south africa saying their welkom branch cant give you a straight answer and they are making you choose between option that might be wrong and still cost you money. If you play your cards well, then the chances are good that they will make you an appointment and send their regional tech to diagnose your problem, if they have such a guy. Thats what land rover used to do. Send out the big guns when shit hit the fan.

 

[Dannler]

Prv should sit on the end of the diesel rail

 

[Cxb3r]

Go rant on twitter and facebook to audi south africa saying their welkom branch cant give you a straight answer and they are making you choose between option that might be wrong and still cost you money. If you play your cards well, then the chances are good that they will make you an appointment and send their regional tech to diagnose your problem, if they have such a guy. Thats what land rover used to do. Send out the big guns when shit hit the fan.

No one can give me a straight answer,
Now for Audi Welkom,
number 1 to expensive for booking in the car
Number 2 diagnostics not cheap.

Not in so much words but ,They told me that my car is so old, that they don't even want me driving it, and wanted to sell me a new model, most parts are discontinued anyway, so basically they told me to get a new car or fuckoff.



I am sure I can rant about Audi, but it will not fix my car.

 

[de0n]

My Ford focus petrol turbo had an issue where it felt like I was driving on a very bumpy road. This was only uphill when the engine is under load, downhill was fine. If I kept the revs high then it was also fine. Ford said there was no compression in one of the cylinders. I've driven a non turbo car before with a burnt valve it felt nothing like that. I would say to try a compression test.