Its a lot of money for that Ed and the car has run fine for the past years with no problem from the tune, the AFRs in the tune were ok apart from when it leans out in higher boost which is a mechanical issue for sure. To 'just' get a stock tune put on it I need an access port type hardware I think at $350 ++ someone kind enough to send me a stock tune. Then a new tune is $1000 + . For a uk tuner who is 'good' its like $2000 + for a tune lol. I have been advised to fix the mechanical issue first, as it doesnt seem to be a tune issue that is the main problem atm; just that the tune is 'quite aggressive'.
not being a tuner I dont know what a tuned map gives out in boost, but hopefully someone can chime in.

 

One other thing I considered is that because the turbo actuators have not been recalibrated with piwis (since I fitted them) that could be giving more boost than I want. I will be looking down that avenue also

 

I got the car repaired and full service all coil and plugs replaced and to my Horror I gave the car a hit and misfire bang again.. this is so so fustrating and only ever on cylinder 2.. doesn’t make sense to be anything like airflow sensor as it’s only ever this cylinder and it’s like you said If I slowly build boost it’s fine it’s just on a big pull with food to the ground.

Thinking of trying a different machanic as my guy cannot resolve it. Scared to drive the car other then cruise atm

No tune in the car and using 100 V power fuel in Germany

 

That is strange. Did they test the injectors when they were out of the car...? what are fuel trims, can you do some logging? Do you have durametric? If you dont have Durmatric you should get it, live logging is what you need and pull the fault codes from the car.

 

I got this fault code before the repairs and have not got it since but only had 2 big missfiers since as worried to drive it in a way that would bring them on. Will buy fhe Durametric
[img]blob:https://www.6speedonline.com/6c03d807-4cce-4f21-b709-9814174722f1[/img]

 

Yes, that looks like a generic scan tool? You need either PIWIS (not likely unless its a good Porsche Indy or OPC) or Durametric which is more than good enough for 99.9% of anything we need. You need to be getting the actual P codes that looks like a generic code which is not reliable to base investigations off from my experience. I used to get some weird codes using a Snap on scanner, then Durametric just told me everything precisely, and some things the snapon said were complete bullsh*t


I have the non pro version, the main difference with pro is you cant code things with it. But it doesnt have the coding power of PIWIS anyway so if I need anything coded I will use an indy who has PIWIS or get a clone piwis setup

 

Yes this is just a little handheld device.

I am considering if I should get the Durametric or a clone PIWIS

 

For diagnostic the durametric is as good. Clone piwis can code more though. If you want to code dont bother with durametric pro, its not worth the extra over regular imo.
either one will give you accurate data on your issue. I am surprised the garage did not scan with piwis or durametric. I would be p***ssed off about that and they just put it back together

 

Very pissed trying to figure out the best option.. digging through if Durametric and Clone PIWIS forums on which best.

I did take it too another Garage and the last 2 misfires have actually not been logged.. but I can hear it.. its a very loud bang just like before.

 

One thing. I have now fixed my car and it is running 110% (first time since I owned it lol). I went through everything I thought my misfire could be . It wasn't logging codes.
Boost Leak Test x Lots - tick
New coilpacks and plugs - already fitted
everything else - done
I then replaced my pre cat O2 sensors and that cured the problem completely. No more backfire or big hesitations. I also replaced the post cat lambdas seeing as I had the exhaust off to do it. It left no codes, no misfires logged.
I would advise buying Durametric for sure. You could have scanned it by now and sold the device for a small loss. Clone PIWIS can also nuke stuff, certainly from a coding aspect, so they are to be treated with caution. I know someone who wiped his ECU completely trying to code something. I would certainly go for Durametric for your situation. You are not coding modules, you are fault finding.

 

So no logs or codes led you to the O2 sensors? Wow. I can't believe the ECU wasn't yelling at you that the O2 sensors were on the fritz.

I am hoping some actual values showed something.

Ed

 

Hi Ed
The O2 readings were a bit off in the data logs I made for both banks (bank one mainly) but nothing showing failure and there was no fault codes logged in the ECU. I really wish there had been!! It would have saved me a lot of time and effort. I got lucky contacting Deejay (Markski) for advice and he was extremely helpful and went out of his way to advise me and check the logs. A true enthusiast tuner and incredibly knowledgeable on these engines. I was already planning to replace the O2s before I contacted him but he went over the logs, told me other things to check and has been generally a top guy! Will defo be buying goodies from him , his customer service is awesome.

 

Continuing this on.

So just found out 2 things on the car which I didn't know the car does have a tune despite 2 shops telling me it doesn't and the another thing is the Cats on the car I have been told are not standard and are both bigger and the tune would have been made to accommodate these.

I will be getting the lamda sensor replaced on the exhaust in a hope this will fix my miss fire issue and a retune is probably a good idea now that I know the tune is not standard.

 

Did you scan it with durametric then?
Any live log data?

 

Hopefully replacing the O2 sensors will cure you're evils. Definitely keep us posted. My guess is a tune is going to need accurate information even more than the stock settings.

In case you are interested, here is a pretty informative post about O2 sensors:

More O2 Sensor Info than you ever wanted to know

Ed