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So, just back from my mate Darrell's place, in darkest Huntingdon. We hooked the old girl up to his VCDS emulator thing, and looked at the injectors at various power settings. There's a clear difference in cylinder three, whilst the others are all reading normally. The car doesn't smoke, or use any oil, and - having replaced the injectors, the only culprit left is the cam and cam followers.🤨 So, I'm buying an aftermarket kit - but fitting Audi-supplied bolts (they are stretch bolts). I'm waiting for a callback from my tech to see how many hours this will be. Anybody know how much more work it would be to replace the cam belt at the same time? He's going to have to re-time the cam etc, so - even though it's a couple of years from being due, I wonder if it might be false economy not to?🤔

Hi Steve, This is my experience from a C4 A6. I started getting the glow plug light flashing, accompanied by a beeping. Usually four flashes. Eventually, a master tech at Norwich Audi told me that this was an indication that the battery was in poor condition, A new battery cured it. As I say, this was a much earlier vehicle, but I thought I'd mention it, on the off chance it's relevant. Cheers, Mike

Silly suggestion - check your floor mat and make sure it hasn't ridden up and is fouling the pedals...

Just sends me to the Q5 page at Pistonheads.🤔 Radical idea - post the price up? 😆

Resurrection update... I left the convertible with Norwich Audi whilst I was out of the country. So, they replaced all the injectors, plus the loom that powers them. Unfortunately, this didn't cue the cruising misfire.😬 Their Master Tech reckons it's likely to be cams and camshaft followers...😱 I've told them to button it up, and I'll decide what to do next... Bugger. Mike 🤨

Well, managed to get the manifold replaced. Here is the old one... <Rolf Harris> Can you see where it's cracked yet? </Rolf Harris> I can't believe how quiet the engine is now - this has clearly been blowing for a while. Still have a misfire/surge at certain throttles settings, though. I think I may have to look at the injectors over the winter...🤔 Hey-ho - maintaining an ageing Audi isn't for the faint-hearted...😆 Mike 😎

Found another one - £120 delivered and being shipped tomorrow... 😎

Update: Audi discontinued these in 2021; they were £580 when available. I have found a breaker with a used one for £150 delivered, and have asked for pics. If anyone is interested, the correct part number is 038253031L

Well, an unexpected (and very unwelcome) addition to the thread. I did an oil change this afternoon and, as soon as I took the engine cover off, noticed that everything was covered in a layer of soot... So, some further delving revealed the culprit... A severely cracked exhaust manifold...😬 Anyone have a spare for a 2.0TDi 140 (BPW) engine? Mike 🤦‍♂️

Hi Steve, I took his answer from a text, "your engine has been breathing in all the EGR gases" - but you're quite right. As regards the state of the filter - it is clogged with obviously carbon based oily dirt. I've never seen a filter fouled this way. It definitely isn't just 2000 miles of airborne contaminants, so I'm mystified as to what might have caused it... 🤔 Thanks for the lead on United Diesels - I'll check their website 👍 Cheers, Mike 😎

So, I put a bottle of this stuff in the tank today... ...and will see if it makes any difference. I also explored the idea of new injectors... Part no 038 130 073BJ - £975 EACH - even with my special discount, they are still £795 each... 😱 A bit of searching on eBay reveals remanufactured ones, with a two-year unlimited mileage warranty, for £151 delivered (each). These are exchange parts, with a £65 surcharge, returned on receipt of your injectors. Does anyone on the forum have experience of these guys? VEHICLO LTD Marek Jasiok Unit 2, Hinckley Business Centre Brindley Road Hinckley Leicestershire LE10 3BY They seem to have good feedback, although their main business seems to be supplying turbos. I'm going to run a couple of tanks of diesel through the engine, probably adding another bottle of cleaner with the next tankful. I'll then drop over to Darrell and get him to hook it up to his diagnostic gear and data-log the injectors, to see how bad they are. If they are misbehaving, it'll make a good job to do when the weather is crap (October onwards 😆). Cheers, Mike 😎

So, after a bit of a gap, I have some news. It was a fairly muggy but bright day, so I drove the 120-odd miles to my tuner Darrell's place in Northampton with the hood down...😎 Arriving just before 1300, Darrell immediately drove me to the pub and told me to have some lunch and keep myself busy... 😆 Rude not to... Meanwhile, back at the barn, Darrell has managed to remove the old ERG valve... Hmmm - that's not supposed to look like that, is it? Touch of carbon build-up there, Hoskins...🧐 He fits the new EGR valve, then does a deep-clean of the exhaust system and the DPF. He then zeroes all the settings on the remap, and sets the EGR 'duty cycle' to a minimal number - effectively deleting it, but without throwing up error codes. He picks me up at the pub in a couple of hours, and tells me that the car will need an oil service as soon as practicable - I was planning this for Saturday anyway. He also tells me that the air filter is filthy and asks when it was last changed. I did this in July 22 (and, it later transpires, only 2000 miles ago). I have a fresh one in the garage to be fitted this weekend. We go for a test drive and the car is quite hesitant at low throttle settings. Darrell assures me that much of this will be the system getting used to it having a valve that functions, but also mentions that the injectors may need a clean. As I need to refuel anyway, I do so with 'Super Diesel', as it promisees extra detergents etc. Can anyone recommend a good diesel injector cleaner additive? After settling up, I drive home - once again with the roof down - why not? 😎 By the time I get home, much of the low throttle hesitation seems to have gone. After releasing my poor dog into the backyard, I quickly pop the bonnet and remove the air filter... Holy crap! Darrell says the entire EGR flow has clearly been routed through the air filter to cause this... I shall complete the service at the weekend and report back with any updates... Cheers, Mike 🤓

Thanks Steve - I'll post up the progress with the work... 😎

New EGR valve has arrived...

"Adapt the new unit" - could you expand on that please Stevey? 🤔 Thanks, Mike😎

I had a proper remap - from someone a friend of mine has been using for ten years - and I trust his judgement. I would think, at 107k miles, it might be worth fitting an £80 aftermarket EGR, and then - if it doesn't work out - fit a genuine one? 🤔

Thanks, Steve. I can get a genuine EGR from Audi for Around £380 - or an aftermarket one for around £80...🤔 eBay aftermarket link There is a slight lag in acceleration, not as pronounced as an early Saab turbo, but noticeable; but I thought this might be a function of having the chip breathed on (which enhanced the performance significantly). I could probably strip down the EGR and have a look at the turbo's vanes this weekend...

Good afternoon all, I've not been online much, as the convertible has been behaving itself. However, a couple of days ago, it threw a hissy-fit and went into limp mode, with the glow plug light flashing (actually, it went into 'undriveable' mode). As soon as I restarted, it returned to normal. However, a day or so later I had a similar event, so garaged it until I had time to use the OBD11 on it. As expected, it started and idled perfectly, but threw up the following codes: P0403 - Exhaust Gas Recirculation Circuit - Intermittent P0234 - Turbo/Super Charger Overboost Condition - Intermittent A bit of googling suggests that the EGR may be blocked or defective. Can anyone suggest first steps to diagnose what needs cleaning or replacing, please? Many thanks, Mike 😎 PS Car is a 2006 A4 convertible with a BPW 2.0 TDi 140, manual gearbox and about 107k miles.

You didn't specify what product from the link you thought would be the solution to your problem. Also - lighten up, why don't you?🙄

So – it's wet and cold here in Norfolk 😃 - and I have just collected the convertible from Norwich Audi, after having the oil pump drive replaced. Everything looked in good order once the sump was eventually removed (pics from my mate Kev)… The drive was pretty worn… …difficult to show in a pic… …but I am really glad I got it done. I'm content that this should now be good for another 100k miles or so… 😎 Amazing how a small part could cause chaos if it failed…

OK - don't bite my head off - but from your description, this sounds suspiciously like a fuel blockage. Sudden loss of power; stops pulling; blockage clears; revs increase... 🤔

Hi Mohammed, Thanks for the update. OK—seems you are on your own with this as far as Audi are concerned, so you need to work out a fix. If this was my car, I'd put a wire brush on my Dremel or drill, and expose all the metal around the rust spots under the bonnet. This should give you a good look at any underlying problem. Assuming you get down to good metal, with no holes or dents from below, I'd get a rattle can of primer, and another of your car's colour, and just respray the area (which needn't be more than a couple of inches (5cm) in diameter). If you find that the rust has formed from a dent from below, you're going to have to do some further investigating…

Have you tried asking the vendor? If he's selling these regularly, this can't be the first time this question has come up... 🤔