TJB193 Posted January 13 Share Posted January 13 Hello all, my HR 350z is giving me all sorts of issues. The current issue being P0171 (Bank 1 too lean). The car has been smoke tested and there are no leaks so its a fueling issue or faulty sensor/reading. The car idles perfectly when hot or cold. If the light is reset and the car is cold it drives fine until it warms up (10/15 mins in) then it gets really juddery and starts missing badly. The misses can be heard at idle, it almost sounds like its been tuned to have overrun. The MAF sensors are new and so are the O2 sensors in the Cats. I am running a Decat. Any suggestions welcome. Thank you in advance Quote Link to comment Share on other sites More sharing options...
MONKEYSOCKS Posted January 14 Share Posted January 14 Has the car actually been tuned since the decats were fitted? Quote Link to comment Share on other sites More sharing options...
TJB193 Posted January 14 Author Share Posted January 14 57 minutes ago, MONKEYSOCKS said: Has the car actually been tuned since the decats were fitted? Yeah it had been tuned. During my process of elimination the tune has been removed & the fault is still here so it couldn’t have been the tune causing the issue. Quote Link to comment Share on other sites More sharing options...
P15UL T Posted January 14 Share Posted January 14 Are they OEM sensors you have installed. The cheaper aftermarket once are known to cause problems. Quote Link to comment Share on other sites More sharing options...
TJB193 Posted January 14 Author Share Posted January 14 44 minutes ago, P15UL T said: Are they OEM sensors you have installed. The cheaper aftermarket once are known to cause problems. The MAFS are hitachi but the o2 is non genuine eBay special. This sensor is on the other bank and they both give near enough the same readings. Quote Link to comment Share on other sites More sharing options...
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