Boxster 2.7 running lumpy - Help please ?

bluenote909 · May 6, 2012

Hello All,

I have a 2000 2.7 Boxster with 78K on the clock. It's always been well maintained and is a fantastic car.

It's used weekends mainly and is garaged. Noticed over the last couple of weeks it feels as if the power is a little hesitant... not fuel starved as such but as if something is not quite 100%

No warning lights , coil packs recently done and in fainess runs ok , no misfire or rough sounds. The engine is dry and has no leaks.

I run it with a K&N filter as the only modification.

My Initial thoughts - plugs , lambarda sensors , fuel filter, poor tank of fuel

Any views or advice welcomed before I proceed with a solution.

Best regards and thank you

Paul

keephatch · May 6, 2012

Could be the oxygen sensors which do eventually fail within the mileage you mention. Something like £200-£250 per sensor.

pjwakefield · May 6, 2012

yes or could be your maf, at around the same price, might be advised to hook it up and see if there are any error codes,
if you don't want to do that, try resetting your ecu by disconnection the battery for about 20 mins , just remember to have your radio code on hand and be able to reset the speedo back to mph from kph

deano25 · May 7, 2012

hi Paul,

Recently had a similar problem with my 2001 boxster s 986. No warning lights, but was running awful. Tried all the obvious as mention, battery disconnect etc but no joy. Took her to OPC Nottingham who fitted a new MAF sensor, and carried out an adaptive roadtest. She now runs perfect and MPG vastly improved! The guys at Nottingham did a fantastic job and a fair price too.. May be worth getting it checked out. Common fault I believe.

Regards,

DEAN.

CLIFFWILKINS · May 7, 2012

It may be your MAF especially as you are using a KN Filter they are not a good idea. Bad for the mafs with an oil related air filters.
Try to clean the maf wire with a electrical cleaner it may help
Failing that it may need replacing.

bluenote909 · May 7, 2012

Thank you all for your advice I will let you know how I get on.

Best regards

Paul

bluenote909 · May 26, 2012

Well thank you all for your kind views and assistance I am very grateful.

End result is

6K miles on K&N needs a clean out.

Removed MAF clean as a whisltle so blows the K&N filter damage theory into Star Wars theory.

Cleaned , soapy water , runs ace !

Thank you all

Paul

Buddy · May 26, 2012

No mention of oiling the K&N so it won't stop the dirt then, I agree with Cliff, I'd stick with a paper filter anyway.[8|]

Nick_USA · May 26, 2012

Rule number 1 NEVER use an oiled filter with a modern Porsche engine; the initial (small) performance gains are generally followed by performance loss and the eventual contamination of the MAF.

Stick with the Porsche paper filter.