2.0TDI Cutting out and hesitating at speed & idle

I've had this problem for a week now.

When I start the car, sometimes it will just stall again, then I can start it again and it will run fine.

Then when I am driving I will feel a slight hesitation from the engine, just as if I'd lifted off the throttle, and sometimes more severe feeling like a brief stab on the brakes, sometimes this will trigger the glowplug light to flash

Yesterday it cut out on me in some road works. I drove it straight to the dealers and told them to sort it out since it is under warranty.

Anyone have any ideas what it could be?? I am clueless, it is very odd.

Any help would be appreciated chaps.

- Ben

Anyone have any ideas?!

Most of the people on this forum are in north america and have never seen a car like yours. I wonder if it is similar to the "bucking" issue with 2.0 Passats?

What is the stock engine in your car? a PD143?

The 2.0TDI Passats that we get here are PD134s. Yes, backwards on purpose.

bhtooefr said:

What is the stock engine in your car? a PD143?

The 2.0TDI Passats that we get here are PD134s. Yes, backwards on purpose.

Click to expand...

It's a 140PD stock with 16V

UPDATE:

The dealers have found out the car is chipped and my warranty will not be honoured, they said the ECU is faulty, so I am having to have one replaced at the cost of 800 pounds.

I went to try and pick the car up yesterday, it cranked for ages and eventually started, but the check engine light and glow plugs lights were both on. I left the car there and told them to hurry up to fix it. The ECU is going to take nearly 2 weeks to arrive.

If I am lucky I'll have it back by the end of the month.

The annoying thing is, they don't even know if the ECU will fix it or not!

This has been a very hard lesson to learn, and I certainly won't be chipping again. The car will stay at standard 140PS!

If the ECU is faulty, contact the chiptuner.

Oh, and I guess someone should've said to have the chiptuner reflash to OE firmware.

bhtooefr: I contacted them, they want to have a look at the ECU, but since the car isn't driveable I can't get it to them until I get it fixed and then I will take them the old ECU and if it is ruined I will send them the bill for the new one.

I have a feeling they didn't re-seal the ECU properly when they chipped it and the ECU has been damaged due to water ingress.

Hi all,

I have a chiptuning company and the ecu in the A4 is inside a box and no way of the water get inside.

I think the problem is in the modification of the maps, ask the chipturner to put the car back to original and you will see that the car run fine.

Regards

Update

UPDATE:

Dealer rang and they have replaced the ECU and crankshaft position sensor, the car is running fine apparantly.

I am picking it up tomorrow. I don't think there was anything wrong with the ECU I think there was just some problems communicating with it due to the method they used to chip it, I have heard of some folks who have their cars chipped using the bench flash method and the dealers diagnostics can't communicate with it afterwards, I believe this is the problem mine suffered.

It has ended up costing me £903 (Over $1500 US) and 3 weeks without transportation.

Captain_Chaos said:

UPDATE:

Dealer rang and they have replaced the ECU and crankshaft position sensor, the car is running fine apparantly.

I am picking it up tomorrow. I don't think there was anything wrong with the ECU I think there was just some problems communicating with it due to the method they used to chip it, I have heard of some folks who have their cars chipped using the bench flash method and the dealers diagnostics can't communicate with it afterwards, I believe this is the problem mine suffered.

It has ended up costing me £903 (Over $1500 US) and 3 weeks without transportation.

Click to expand...

I had a crankshaft position sensor go on my 2.0tdi too! Looks like you’ve been flunked by the dealer making you buy a new ecu, as they would’ve been able to scan the codes from it before even considering to buy a new one.