Okay when i got the car back i was running ngk heat range 7.....fouled them out. heat range 6 fouled them out....and then today i replace them with heat ranbge 5's and they feel fouled out. Im running rich i know but there must be something wrong. any ideas?

 

SR? KA? I have no idea what you have I'm just guessing by the Nismo banner in your signature that you have a 240.......

 

he has a sr

 

o2 sensor could be F-ed. I would try replacing that and see what goes down...

 

fuel pressure regulator ? just a guess dont know much about 240's but o2 sensor sounds like a good one too also try map sensor could be throwing the fuel pressure reg off a bit? once again just guessing . good luck w/ it see u out and about this weekend?

 

I have an SR buddy.

 

for the nismo heads...what o2 sensor do i use?? can i use one off of a se-r?

 

LOL sorry to laugh right at ya but your asking me soemthing i know nothing about (nissans). I know generally when your engine is consistantly dumping a too rich fuel mixture, then your O2 sensor is needing replaced. Im not sure of the specifics but i would recommend taking yours out, and trying to scam one from antoher sr motor. try and get as close to what you have as possible. then try changing variables...good luck

 

 

Also make sure your MAF is working right, this can mess with fueling a lot also..