I was driving around with a friend today, I had the car on sport mode and pushed it on full throttle, that was when I got a check engine in the dash, after a few seconds in disappeared.

I went home and put the car on diagnostic, I had two fault codes - P003 random/multiple cylinder misfire detected upper limit valve exceeded

P0603 internal control unit keep alive memory (KAM) error

Upper limit valve exceeded

Thx

 

mods?
miles?

 

I have a full VTG based kit. I think that is a bad fuel problem

 

could be, or also plugs? But what diagnostic tool was used? Note these codes 'may' be specific Porsche ones vs. generic OBD codes, some of the codes can be manufacturer specific and I think those ones can be vs. generic codes.

 

Plugs?

 

The plugs have 10k kms on them. I used durametric diagnostic tool

 

I'd fill her up somewhere else, hopefully you have seen the last of the code.

 

my bet is worn plugs

 

I have filled it from another petrol station and so far no problems. I just want to know what the codes mean

 

Pretty sure those are spark plug/coil codes.

 

It says clearly multiple misfiring, this is why I think is the fuel. I changed spark plugs last year, I think I have 15000kms on them now. How long do the spark plugs last on modded turbos?

 

20k miles modded they say, but mine looked pretty good when swapped out at that level but then again I dont drive mine hard at all.

 

Milou I have gotten this a few times, one was recently. Always same reason really; bad fuel and/or worn plugs.
As for the plugs with your boost and power you should change every 5k kms or 7.5k. Everytime I ve held them more on mine we saw them damaged.

You can bet that the misfires came because of bad fuel and usually when that happens its time to change the plugs.

 

Agreed!!!

Stock sparkplugs won't last long

 

Are there any plugs than will last more than the stock ones on modded cars?