16 FSI misfire and something I have noticed

PlasticMac said:
I had not heard that injector failure, at 100,000 plus was common in the FSI engine. If correct, then at the first failure all four should be replaced I guess.
Injector spray pattern is an important part of the FSI design.
Mac.
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You are correct, I think this FSI we are talking about is at 130k+ miles if I remember, right? Bumble did a great job of going through the ways to eliminate other things but it was just very similar to how my car behaved at 128k miles when I replaced my injectors. I have seen a good few FSI's that have been in a situation like this and new fuel injectors did wonders for the misfires.

Hopefully, you will be buzzing around in your car with a big smile soon enough! :) @Bumblebee
 
PlasticMac said:
You can check injector values with vcds, but I've not done this on the A2. It worked on the TT, so no reason why the FSI would be different.
Select Engine controller, then Group 13. Don't know values for the FSI, but if one injector is suspect, I'd expect to see an outlier value for it.
Mac.
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Great as always Mac - Thank you and lets see what it bring up ;)o_O
 
PlasticMac said:
Well, failed miserably, nothing on Group 13. Not sure if this is an FSI thing. All the reference info points to Group 13, but will keep looking.
Mac.
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I've emailed Rosstech, to see if they can help. It's as if the injector data is not being requested. I'll update here as soon as I get anything.
Mac.
 
PlasticMac said:
I've emailed Rosstech, to see if they can help. It's as if the injector data is not being requested. I'll update here as soon as I get anything.
Mac.
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I've got an answer back from Rosstech, and it's bad news for petrol A2 owners, (but, very good for the oilers amongst us).
Here's the answer:
"The screenshot shows a diesel which works completely differently. I'm not aware of any way to check stuff like that on a gasser"

Mac.
 

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The dreaded misfire is back, in fact it never went away....I just tried to stop noticing it with my head in the sand.
At a drive thru window on Saturday I quite violently stalled (we've all done it....let the clutch out sharply as we thought we were in neutral but alas were not). When I restarted the EML came on for the first time in months and the running was poor, I have a feeling I'm running on just the 3 cylinders.
Just wondering if any experienced A2ers would think a kangaroo-style jump stall could worsen the issue
 
Oh yeah I know its cyl4 misfire. My neighbour also has an A2, I might try persuade him to come along for a visit to the nearest A2OC scan service. Cheers
 
Hi, last weekend, i met up with @simes2024 to scan his lovely FSI. The car has just under 100k mileage and although it had had its EML on, it had gone off a few days before.

Ive attached the readings below. The first one is the first scan. The second is after the codes had been cleared and took it for a drive round the car park. When i looked into the measuring blocks it was only cylinder 4 that was recording misfires. Plugs and coil packs have been changed and it is run on the correct fuel .

To be honest, the engine whilst a little lumpy, wasn't too bad and a bit better than my FSI. I did mention that mine had recently seen a bit of improvement by using mass air flow sensor cleaner and that is something very cheap and easy to try. Otherwise, i think its a case of trying easier options first (cleaning earths etc), before looking at injectors, but any suggestions very gratefully received.

thank you :)
 

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Ross-Tech has this to say:
"Injector(s) leaky/dirty
Compression loss
Possible Solutions
Check Injector(s)
Check Compression"
Which sounds about right to me. Start with compression test. If that's OK, then injector swap between cylinder 4 and one of the others perhaps.
Mac.
 
PlasticMac said:
Ross-Tech has this to say:
"Injector(s) leaky/dirty
Compression loss
Possible Solutions
Check Injector(s)
Check Compression"
Which sounds about right to me. Start with compression test. If that's OK, then injector swap between cylinder 4 and one of the others perhaps.
Mac.
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Thanks @PlasticMac I'm going for injectors on Mabel next, now I've got her actually running 🤞
 
Teresa said:
Hi, last weekend, i met up with @simes2024 to scan his lovely FSI. The car has just under 100k mileage and although it had had its EML on, it had gone off a few days before.

Ive attached the readings below. The first one is the first scan. The second is after the codes had been cleared and took it for a drive round the car park. When i looked into the measuring blocks it was only cylinder 4 that was recording misfires. Plugs and coil packs have been changed and it is run on the correct fuel .

To be honest, the engine whilst a little lumpy, wasn't too bad and a bit better than my FSI. I did mention that mine had recently seen a bit of improvement by using mass air flow sensor cleaner and that is something very cheap and easy to try. Otherwise, i think its a case of trying easier options first (cleaning earths etc), before looking at injectors, but any suggestions very gratefully received.

thank you :)
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Hi Teresa, you mentioned that a knowledgeable member (I don't recall their name) knew of an inexpensive (perhaps £25) part that might, with some luck, prove a quick fix, though I'm fairly sure you did not mention mass airflow sensor as I would have remembered that (a friend is having that issue with his beamer).
I will check the compression next opportunity I have. Thanks
 
simes2024 said:
Hi Teresa, you mentioned that a knowledgeable member (I don't recall their name) knew of an inexpensive (perhaps £25) part that might, with some luck, prove a quick fix, though I'm fairly sure you did not mention mass airflow sensor as I would have remembered that (a friend is having that issue with his beamer).
I will check the compression next opportunity I have. Thanks
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One cylinder is down on the torque which it is producing. So your not getting the energy you should from fuel air mix that is in the combustion chamber.
So, either the mixture isn't correct, or it's not burning correctly, possibly because it's not being compressed enough. Finding the cause is going to be a process of elimination.
Easiest, and cheapest is the compression test.
If that's OK, move on to the fuel air mixture, particularly the fuel content.
Mac.
 
Think I may have to do compression check and put one of my new coil packs it came with in it.
Light came on again other day. Cleared the codes though.
 
I haven't read through the whole thread so this might be in there somewhere, but another relatively easy thing to check is the wiring to the coil packs. its been years since i've owned an FSI, but one of mine was improved by correcting a short in the coil pack wiring - the plastic wire outer can crack and short., on mine it was pretty easy to spot as the area was blackened.
 
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