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Discussion Starter · #1 ·
So I bought a 2013 S5 a couple months ago 75k on the clock.

Great car. I loved my 2014 S4 I had a couple years ago so wanted to get another!

This one seems to have its issues though.

The one I can't work out is... It stinks of fuel while I have the window down at slow speeds. Especially while cold. Also stinks after a hard pull.

It isn't coming from the engine bay it's more around the sides of the car.

The oil also seems to smell of fuel.

I've had all 6 injectors refurbished.
Compression and leak down test is OK.
PCV has been replaced.
No fault codes.
Nothing seems to be dripping down under the car.

There is an oil leak but doubt that's related.

The spark plus are black around the thread but they aren't completly black. I am going to replace them though.

The car does have seemingly aftermarket cats... not sure what that's about.

I bought a borescope and had a look at the pistons... most looked like picture 2 but there was one where it seems some of the carbon has been cleaned off. See attached.

Anyone got any ideas or advice?

Some pictures:
Cap Hood Microphone Hat Automotive design


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May or may not be related, but there was an Audi recall on S5's not that long ago to get the fuel rails replaced because of possible leaks, maybe worth checking out with Audi Dealership to see if your car needs the recall work done, it's free.

JG
 

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Audi's fuel rail recall designation was '24DP'

Sent from my IN2013 using Tapatalk
 

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Certainly worth checking cos fuel rails sound like a likely culprit methinks!!!
 

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More info here

 

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Discussion Starter · #7 · (Edited)
More info here

Ahh seems like mine is a march 2013 looking at Total Car Check

I'll run my car at idle and see if I can smell fuel coming from under the supercharger.
 

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Although the picture is out of focus that engine does not look like a CREC.
 

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The fuel rail recall was on the CREC engine produced after May 2014. And it was the low pressure rails for the port injection which your 2013 S5 will not have. Us CREC engined S5s have 12 injectors! :)

Is that pic of the piston top/crown? Clean pistons usually mean coolant leaking into the combustion chamber steam cleaning the piston. Hope it's not that, but the earlier supercharger intercoolers are known to leak coolant into the inlet.

From what you are saying your car smells of fuel on the outside when the windows are down you can smell it? Does it smell like neat fuel or does it smell like a rich exhaust smell like a lawn mower? I suspect as you mention 'aftermarket cats' you may have no cats and you are smelling catless fuelly fumes!? :) When cold or been for a blast, the mixture will be rich enchancing the fuel smell from the exhaust.
 
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Take it for an MOT and CO test, that will tell you if you have no cats, but they will fail your car if so.
 
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Discussion Starter · #11 ·
Cheers, I just feel a little overwhelmed by the car to be honest 😂

It stinks of fuel. Cold, warm idling or on a pull. I think getting someone to do an emissions test would be a good idea.
The flywheel is rattling and my specialist says it needs a new one.
The suspension is knocking and I need 8 new arms. Costing 1k on its own!
It's got an oil leak
The coolant does seem to drop a bit.

Guess just tackle one thing at a time but the mot is due in Feb 🤦‍♂️

I won't be buying private again that's for sure!
 

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Difficult to diagnose the fuel smell without being there.
Is yours a manual or DSG? Manuals are very rare! The DSGs can have a rattle when warming up, which goes when you select drive and when fully warmed up. This is common and the input shaft rattling on idle.
Try and source the knock before replacing all the arms!
Where's the oil leak, this can be easy or difficult :D
These engines can loose some coolant, but shouldn't really and as I said, hope it's not a leaky intercooler! check for external leaks first.

Just post on here when you are to tackle each issue, we can help save you time and money! (y)
 
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Discussion Starter · #13 ·
Difficult to diagnose the fuel smell without being there.
Is yours a manual or DSG? Manuals are very rare! The DSGs can have a rattle when warming up, which goes when you select drive and when fully warmed up. This is common and the input shaft rattling on idle.
Try and source the knock before replacing all the arms!
Where's the oil leak, this can be easy or difficult :D
These engines can loose some coolant, but shouldn't really and as I said, hope it's not a leaky intercooler! check for external leaks first.

Just post on here when you are to tackle each issue, we can help save you time and money! (y)
I understand that, it's hard to diagnose in front of the car let alone on a forum 😂

It is a DSG. My S4 had the rattle on idle I recognise it. But this is when you are decelerating and you can hear the noises when window down moving backwards and forwards slowly even after an hours drive.

All 8 arms are apparently perished.. I've had 2 specialists say the same thing. The car is a cat N. So im not surprised as it seems the guys just bodged it where they could to make a quick profit. But is coming from one of the upper arms hitting the top of the wing.
 

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Yeah, I can give keyboard a right good sniff, but still won't be able to smell the fuel smell ha ha :D

Hmmm, flywheels only tend to give a rattle when no load going through them, like at idle. They can give a judder or vibration under load or decelleration but a rattle when decelerating is normally exhaust related.

Whereabouts are you based?

Do you know what the damage was on the car before repair? Cat N is non structural, so could be electrics, mechanical, stolen and recovered.
 
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Discussion Starter · #15 ·
Yeah, I can give keyboard a right good sniff, but still won't be able to smell the fuel smell ha ha :D

Hmmm, flywheels only tend to give a rattle when no load going through them, like at idle. They can give a judder or vibration under load or decelleration but a rattle when decelerating is normally exhaust related.

Whereabouts are you based?

Do you know what the damage was on the car before repair? Cat N is non structural, so could be electrics, mechanical, stolen and recovered.
😂

Sorry I must be getting mixed up in all the issues!

Rattling when decelerating... thinking about it yeah this is probably exhaust.

There is a clunking and thudding which is what I think the garage thinks Is the flywheel. This happens when moving backwards and forwards. Apparently they had it on the ramp and could hear the flywheel knocking with light acceleration. The DSG box has been out the car apparently before according to the garage.

I'm in Bristol.

No but definetly something to do with front left. Shitty paint job on the wing, badly repaired abs sensor and rad pack from the b8 which the pin out is different to the 8.5 so they have made a mess.. it works though so I'm not touching it! Oh and undertray was held on with wood screws 🤦‍♂️
 

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I'm not convinced on the flywheel giving a clunk. It's more likely the drive train like a worn uni joint etc on the prop shaft. I had a BMW that did this. A flywheel only turns one way so going forwards and backwards shouldn't make any difference.

Yeah that's the chance you take with a damage repair, either done properly so you can't tell or done by a DIYer who shops at B&Q for his screws. :D
 

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Has it been modded? Just wondering if you have had VAG com diagnostic run on it? It will also show the number of launches which isn't the best for the drive train! That's why Audi put a counter on the number of launches in case they had a warranty claim. ha ha :)
 

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Discussion Starter · #18 ·
I'm not convinced on the flywheel giving a clunk. It's more likely the drive train like a worn uni joint etc on the prop shaft. I had a BMW that did this. A flywheel only turns one way so going forwards and backwards shouldn't make any difference.

Yeah that's the chance you take with a damage repair, either done properly so you can't tell or done by a DIYer who shops at B&Q for his screws. :D
I'll see if I can record the noise later. It's definetly lower priority than the fuel smell and suspension.

I'm getting about 100-120 to half a tank. I know it's no Nissan Micra but it seems excessive. I'm sure my S4 was 290 - 350

😂 and paint from halfords

I have vcds. There are no faults at all! Apart from a fuel cap issue which I had on my old Scirocco. Launch control has been used 13 times. I remember looking it up the other week. 2% of the time driving is in sport.
 

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290-350 has to be a full tank!? 100-120 miles to half a tank on shorter urban journeys with some blasts sounds right to me, well that's what I get. Overall average is 21mpg on the DIS. On motorway runs I do get 42mpg regularly.

Aw no, if you are a bit superstitious like me you need to do 1 more launch. :D
 
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