whoosh.....stutter........CheckEngineLight! [fixed pg5]

[RedRobin]

[john_o]

to be fair I always used to run VPower or Optimax , but after 1 tank of Tesco 99 I could definitely feel and see higher peak boost with that. So i stayed with it.
Now however I may mix the three

[john_o]

story as yet not written ......................more CEL's on different fuel..................more info to follow

[bacillus]

Sorry to hear about this again mate!

Did you scan with VCDS?

[john_o]

Awesome are on the case. And have been nothing but helpful , Jims a top guy 
Initially my continuing faults were cylinder 3 misfire BUT on actually logging the car actually shows misfires on all cylinders.
Of which the main problem is that at high rpm the requested vs actual drops off significantly (although not to fuel cut levels) but enough to trigger my misfires.
The problem is that the car should have enough capacity to deliver this, so I have an underlying problem that means my car cant.
Obvious starting points have been new std rail pump / PCV etc , none of which have helped.
std rail is 110 bar , with APR software requesting 130ish (to maintain AFR levels for the EGT temp)
Usually low rpm is the problem area!
Next steps are looking at the fuel system from rail to tank , filters etc. And to see if I have some cr*p at the bottom of my tank.
Its could also be an injector problem (I have seen S3's on audi sport with high rpm misfires!)
Its an unusual case , esp as my car ran like a train 2 days after the remap at Prosport under load several times to the redline (no fault codes!), go figure 

out of all the remapped cars it did have to be mine thats a 'problem' child 
Anyway I have every condfidence it will be resolved soon.

[Phil Mcavity]

flash it back to standard without the map would be the best starting point tbh.

[gazbutS3]

Awesome are on the case. And have been nothing but helpful , Jims a top guy 
Initially my continuing faults were cylinder 3 misfire BUT on actually logging the car actually shows misfires on all cylinders.
Of which the main problem is that at high rpm the requested vs actual drops off significantly (although not to fuel cut levels) but enough to trigger my misfires.
The problem is that the car should have enough capacity to deliver this, so I have an underlying problem that means my car cant.
Obvious starting points have been new std rail pump / PCV etc , none of which have helped.
std rail is 110 bar , with APR software requesting 130ish (to maintain AFR levels for the EGT temp)
Usually low rpm is the problem area!
Next steps are looking at the fuel system from rail to tank , filters etc. And to see if I have some cr*p at the bottom of my tank.
Its could also be an injector problem (I have seen S3's on audi sport with high rpm misfires!)
Its an unusual case , esp as my car ran like a train 2 days after the remap at Prosport under load several times to the redline (no fault codes!), go figure 

out of all the remapped cars it did have to be mine thats a 'problem' child 
Anyway I have every condfidence it will be resolved soon.

several of the 08 S3 cars have shown this exact fault John, shows up as cylinder 3, but evident on all, when revo'd, mine being one of them. 07 cars don't do it and can run really aggresive settings, but 08 cars can't. Nobody knows exactly why, but my misfires cleared up when I put the downpipe on so the thinking is lampda sensor readings, this has been backed up by a few different people. But your car is 07 isn't it, but lampda sensor maybe?

[john_o]

My cars a 57 plate so it could be crossover. good points though Gaz thanks
Phil , the car has been run in stock mode back to back with mapped and logged and no faults. (i.e the requested vs actual match)
But thats because standard map only ever requests 110bar max.
Its that additional headroom (which should be available) that it just wont give.........

[Hurdy]

I know how you must be feeling at the moment John. Whenever my car wasn't running right it really P1ssed me off. Keep the faith and it'll come out okay in the end

[john_o]

Cheers for the positive words  Hurdy , yeah its not the route Id planned lol but it will happen.
The car actually runs fantastic 99% of the time  , as long as I dont extend the revs too high

[bacillus]

But thats because standard map only ever requests 110bar max.
Its that additional headroom (which should be available) that it just wont give.........

Can I assume you have an uprated HPFP with APR pump specific software?

[john_o]

nope, std pump which should deliver 130bar. (which to be fair it does at lower rpm) , thats why a swap was attempted.
Adding a HPFP has been considered but a) I shouldnt need it and b) it may not even help
(still cant believe it pulled 320bhp @ prosport!) but time will tell.
Ironically some maps request less fuel pressure (and allow AFR to lean and EGR to raise above recomended limits), so on those I may not have had a problem!

John

[gazbutS3]

Strange this, is it the same map they used on my ED30 do you know John, that ran great on the stock pump, doesn't help you I know

[sibart]

I know this may be of no consolation but I had exactly the same problem on my Octy (REVO).
Tried all sorts including extra ground wires to the coil packs. Its an tuning industry wide problem.The fault eventually cleared itself on my car???????. Revo had it on there Demo Seat which went when they changed the exhaust so i'm told.
It really is a puzzle of which no-one has found a defined answer.

[RedRobin]

It really is a puzzle of which no-one has found a defined answer.

....Those are the worst kind of faults!

Btw, your ex K03 turbo is holding out and delivering very well indeed so far!

Thanks