Stalling shortly after 'warm start' failing - help!

Hi!

I have recently bought a 03 A2 1.6 Colour Storm in the gorgeous blue colour, what I think is a pretty basic spec model (no DIS, rear e/w etc.).

I'm massively impressed with it, but it is having a problem with warm starting that is completely defeating my ability to trust it - quite an issue obviously!

The car starts first time every morning (albeit with the trademark 'FSI rattle') and performs fine on the journey. The problem occurs if it's warmed upo and I stop for a short while (e.g. to pop into Tescos), that's when the lottery begins... :(

Sometimes everything will be fine, but around 50% of the time now I get a few yards down the road and you can feel the car starting to die. It stutters, coughs, struggles and eventually stalls. If you try and restart it won't play, no matter how hard you mash the throttle ;-)

A few times i've managed to coax it into not stalling when I feel this happening (by luck rather than judgement, pumping the throttle which feels like you are managing to 'clear' the problem - it has a 'big cough' then clears the problem), but generally speaking this doesn't work.

When this happens, the only solution seems to be to leave it for a while, then try again (half an hour or so later) and then it will start up.

I had this happen last night (annoyingly with a chinese takeaway in the car!), and once I got going again (with a cold chinese) the EPC light stayed on for about 30 secs after starting.

Now, the car is a recent purchase and I have a 3rd party 3 month warranty, but as usual, that won't cover main dealer rates, and they cover a fix *up to £500) but not the diagnosis (particularly if the garage can't find the fault).

I took it to the local reputable private garage when this first occured who found the fault code P1020-17428, which so far as I can tell means 'Fuel pressure regulation:control range exceeded'. The garage said there is no way of knowing how long this fault code has been in the system, they cleared it and said come back next time it happens (which i'll do this week).

Obviously i'm loathed to take it to a main dealer (the purchase was actually meant to be a way of reducing our motoring costs!) but that said I need it fixed and need it 100% reliable.

Finally, in my eternal optimism I picked up a fuel filter from the local motor factors and changed that, but it seems to have made no difference.

Any assistance would be much appreciate, there seem to be lots of knowledgeable people on here who might be able to assist.

Cheers!

P
 
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hmmm. it could be something as simple that the throttle body needs cleaning.as i know that the fsi does have a tendency to oil it up on occasion(never happened to me yet!). failing that see what the scan brings up this week--as the error is pointing to fuel supply it could be a problem with the high pressure fuel pump on the engine.
I'm sure our more technical guys will be along soon to give their thoughts good luck mike
 
Thanks for that link, I wonder if it's worth taking that to the local garage to check out... feels dangerously like being something only Audi themselves can fix.

Shame it's intermittent, makes it a real PITA!

P
 
If it's a sensor then it'll be something that can be changed by any competant person or garage.

Armed with the above link, you could visit a trusted non-franchised garage, but I'll see if I can't shed any more light in the meantime.

Cheers,

Mike
 
Is there an A2 FSI service manual online anywhere?

Any way I can find out parts prices without calling Audi?

Thanks! :)

P
 
Paul, take a look at this for the item locations:

FuelPressureLocationFSI.jpg


There are various elecrtonic manuals available on Ebay, look for ELSAWin, whoch cover various models, all should include the A2 FSI.

As to parts prices, I can tell you the rough prices, as I have access to the parts catalogue, but Audi will be able to give you the definitive price and availability.

For info, the fuel pressure valve is around £77.

Cheers,

Mike
 
Cool, thanks for that, will post back with how I get on!

Plan is to take it to the garage down the road tomorrow to get the fault codes read (to see if that is still being identified as a problem), phone the warranty people to see if I can get ANYTHING useful out of them (not convinced), phone the Audi garage for advice, then decide what to do!

P
 
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Well, if you have a warranty, they can't claim either of the parts (the pressure sender or the regulator) are subject to wear and tear, so they should be covered.

Fingers crossed and keep us informed of how you go on.

Cheers,

Mike
 
Hmmm, what to do - nobody i've called or visited thus far has managed to come up with anything really concrete or particularly useful, and Audi will charge me £75 + VAT to plug it in and come up with their solution.

Any advice? :-/

P
 
Hmmm, what to do - nobody i've called or visited thus far has managed to come up with anything really concrete or particularly useful, and Audi will charge me £75 + VAT to plug it in and come up with their solution.

Any advice? :-/

P

Hi Paul
If you are handy with the spanners, get a copy of Elsa and take a look at the fuel pump and strainer. I've heard of all types of debris floating round in fuel tanks which can occasionally block the fuel pump inlet mesh.
Next, you need the help of someone with VagCom. With this diagnostic kit you should be able to monitor fuel pressures while driving to show if something is wrong with the fuel pressure sender or regulator.


Cheers Spike
 
Sadly not handy enough with the spanners to have a go at anything myself...

It's been for it's diagnostics with Audi this morning (at £75+VAT!) and the outcome is this document:

http://content.modaco.net/imagewell/AudiForm.jpg

The gist of it is that it's gonna be 3 hours labour they reckon (£90 + VAT per hour) and 1 of the two parts shown here - either the 'Thrust Sensor - 06D 906 051A' or the 'Fuel Supply Module - 8Z0 919 051 C'.

I'm kinda at a loss as to what to do now - seems like the probability of getting a monster bill is pretty high, I wonder if I should now take this to the third party garage.

It's unfortunate that they can't be sure which of those two parts it is (they suggested they'd replace them in turn to determine which is faulty).

Thoughts?

P
 
Grrr, spoken to the warranty peeps and the warranty specifically ONLY covers:

Fuel System - petrol/diesel

Mechanical / electrical fuel pump, air flow meter, E.G.R valve, idle control valve (excluding injectors).
Hence, it doesn't look like either of these 'possible problems' are covered. What a crock! :(

P
 
interference or help ? - i don't know

I had same problem with my diesel A2 recently but i dont know how closely linked it can be with yours but id just like to throw this in the mix:

I had exactly same symptoms and it is a pain in the bum no dispute there
The fuel supply was being cut off due to lack of signal from sensors. So ECu cuts off fuel to prevent serious damage to engine. I thought it was cam sensor but after replacing this i had same problems so moved on to the Crank sensor as soon as i replaced that the problem was cured and have had no issue at all since January, before i got to the crank sensor i also replaced fuel filter and checked supply lines - i couldn't see any problem there and so was stumped.
I think what was happening was that the crank sensor failed or became too weak to transmit a signal via it's magnet and so the ECu shut down the fuel supply leaving me with a turning over engine but no fuel. This might be happening on yours. I could usually start it on a bump off start and magnet strength is sensitive to temperature this might be something to consider bu ti do hope it's not a red herring. I read that fault codes don't always tell you the problem you have to trace back to why (in my case ) no fuel was getting through and triggering the cam sensor fault
Tdiclub.com are quite good at discussing these annoying issues
It could be that if you trust your audi dealer this might be the best way of sorting it !
good luck Paul
 
Interesting, thanks... from what I can work out based on latest available info the fault codes indicate that too MUCH fuel is being fed rather than not enough.

What a pain!

Do I trust the Audi dealer? I trust them to try and maximise their profits... ;)

P
 
So here's the plan, i've ditched the idea of using the main dealer on the basis that the A2 is meant to be a 'budget car project' (cutting costs from running our main car, a Mazda 6 MPS!), so it's going in to the local independent specialist SVA (http://www.svaspecialistofnorwich.co.uk/) who thus far have been very knowledgeable and helpful.

They're gonna replace the thrust sensor first (at my request), we'll see if that helps, and if it doesn't, then it'll go back for the fuel supply module.

If neither of those fix it, i'll be seriously pissed! ;)

Wish me luck!

P
 
New update, the car has now been to SCA and had the thrust sensor replaced. It turned out to be 2.5 hours labour (albeit at non main dealer rates thank goodness!) as the sensor is a right PITA to get to.

I'll report back with how it goes...

P
 
Sadly, the problem seems to have got WORSE if anything!

Now on to the next part recommended by Audi, the fuel pump, really hope this fixes it! :(

P
 
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