Just run mafless. Make sure your plugs are gapped correctly or else you will continue to have misfires. Talk to you tuner on what he recommends.

Here's a good quick read--

http://www.neuralblog.com/_content/P...-707_pn-1.html


High performance plugs, for tuned Porsche 997 Turbos

The following High performance plugs, for tuned 997 Turbos are recommended:

• Best reccomended plugs are the: PK20PR-P8 Denso. Close the gap to .025" for higherboost levels.
• The NGK equivalent of stock number 2667 of BKR7EIX is also recomended and used in many of the high horse power Porsche 997 Turbos. The Denso also works well.
• Ruf apparently run the "Beru Ultra 14 FR-6-LDU" plugs on their 550 Rturbo.
• Stock OEM for the 997 Turbo being the Bosch FR6DPP332 spark plugs.

For Turbo's running under 650hp (crank), OEM plugs may be used and life expectancy would be the same as that of the Denso and Beru mentioned above. Once you start venturing into the higher horse power applications it would be recommended to change up to the "one stage colder" plugs (mentioned above) as replacement to the Bosch OEM plugs.

 

Have you cleaned and re-oiled the filter? Curious if a stock oiled one may have fouled the sensors vs. a user cleaned one.

 

Are you suggesting there could be something more sinister than the MAFs, which will show up on the stock flash?

 

I just took it out of the pack and stuck it straight in. It has been in for about 2000 miles. Do you think the oil from the BMC could have fouled the sensors?

 

I disconnected the sensors for the drive back from the dealer, but there was no difference. The plugs might be past it.

I have read that article it is quite helpful. I am running standard plugs with standard gaps at the moment.

 

Install the Denso PK20PR-P8 and gap to 0.025". That will work well with your tune. If your gap is too wide then you will get misfires at wot/high load/high boost. With a flash, be prepared to change your plugs a lot more frequently for optimal performance.

 

Could be. Some codes won't show with flashed file
Go back with stock file then scan it again.

 

Doubt it on a fresh filter but likely if user cleaned and too much oil is used.

 

excellent info here

 

I have confirmed with the tuner, and they recommend 0.025" plug gap for my mods. MAFs have been ordered, awaiting for delivery.

 

It looks like Bob was right with the MAF suggestion. There was definitely a lean condition. I ran with out MAF sensors whilst waiting for the part, and the misfiring reduced over time. I now have the new MAFs in and the car is going even better again.

Not sure if the plugs will still need replacing after no more than 600 miles with the fault. I will check with the dealer and see how it goes.

Thanks guys.