constant negative fuel trims help?

[superchargedjuggalo]

fuel trims never go positive and go as low as-18 and as highas -8. maybe an exhaust leak at crossover, could this cause kr? or loss of power? what else can cause low ltft

[Jevik]

I forget which way my fuel trims were.. but if that's running lean, I had a bad fuel pressure regulator on my accord that caused a check engine light it was running so lean.. number was around 30-32.. Also if lean, check injector flow, fuel filter, o2 sensor on the rear manifold, and the fuel pressure. running lean could also cause knock.

[L36 Killer]

leaking fuel pressure regulator is a possibility.

[superchargedjuggalo]

negative numbers mean rich postive numbers mean lean but i got overkill in the mail today and the egr and o2 senors were disabled. every problem i have described on the car is gone not sure why the stock pcm would make this much of a difference unless the egr or o2 was bad but car is now kr free ltft are now right around normal, still a little low but car is perfect. thank you for everyone who attempted to help.