I have been having a misfire problem only when at higher revs and throttle. I changed the MAF. This improved the car's somewhat but still getting a CEL. My durametrics code reader is giving me:

P0410- secondary air too low on cylinders 1-3

And misfire codes for cyl 1-3

This seems like it is enough information to make a specific diagnosis but I don't have enough experience to pinpoint the problem. Any help here would be greatly appreciated.

 

Is this just post #22? But seriously, maybe a list of mods, especially recent ones might help the more knowledgeable on the board help you. (wild guess MAF)

 

How many miles on the plugs? What kind? (ie are they stock or did someone change them once already)

 

cracked coil packs ...bad plugs.

 

get the Denso IK22 plugs...

 

thanks for the input guys. really i don't know how many miles on the plugs. dealer said they were changed before i bought the car used, porsche certified with 28k miles on her, but i doubt it. after the MAF, plugs are next. Given the geat spark plug debate, i am hesitating. dealer sent me a set of the beru's but am leaning bosche fr6, or maybe the denso's. ???????? not looking forward to the project but its next. a bit bothered by the fact that its all on one bank.




2002 996tt tip, fvd flash, evo DV's, BMC filter

 

Invest a couple hundred dollars in a scanner and see what your sensors are doing at high rpms. It may eliminate the guess work.

 

here is the follow up for the record. spent all afternoon changing the plugs. what a pain in the ***! but the problem seems to be solved! no damn CEL flashing in my face. based on research and local availability i went with NGT iridium plugs. first test drive blew a boost hose that wasn't seated properly. reset with a quick battery disconnect. snapped the boost hose back in and i am up and running. life with no CEL, hurray!

 

here is the follow up for the record. spent all afternoon changing the plugs. what a pain in the ***! but the problem seems to be solved! no damn CEL flashing in my face. based on research and local availability i went with NGT iridium plugs gapped to .028in. first test drive blew a boost hose that wasn't seated properly. reset with a quick battery disconnect. snapped the boost hose back in and i am up and running. life with no CEL, hurray!

 

Glad you got it fixed! Plugs make all the difference in these cars.

 

Dan,

what do you think of that plug for a stage one or two car? I went with what was available on sunday (poor planning).

 

hey if it works it works I use the Denso in our cars. But probably similar http://www.vividracing.com/catalog/d...5-p-28441.html