Are you using a 7M resistor with those 550cc inj? I think I have a set of 440cc inj. from a JDM 2J, direct swap in with no resistor needed. Might help you troubleshoot the issue.

Josh

 

Yea thats why your are bogging down. Way to rich.

 

Closed loop is from 0-4000rpm where the stock ecu uses o2 feedback to make fuel adjustments. Try setting the low map back to 0. Set the low throttle around 70% and hi throttle at 80% and only make adjustments to the hi map. Hopefully the stock ecu can pull enough fuel to maintain a steady A/F with the bigger injectors.

 

I know but it comes out of nowhere. It'll be running fine and then just dump fuel out of nowhere, it's only done it to me when I'm cruising at around 2-3k

 

I feel for you I am edxperiencing someth9ing very similar but it goes lean for me. I may have a bad O2 sensor after one of my cats though, well if I had cats it would be the sensor after the cat. I'm going to throw the scantool on it next week to see exacxtly what is going on.

 

That definitely sounds like the ecu is readjusting during closed loop since you are only experiencing it during cruising around 2-3k. Have you tried what i suggested above? If your worried about loosing your settings, you can always write them down before you make any changes and revert back if needed.


Usually the secondary O2 is only used to make sure the cat is functioning. It should have no affect on A/F.

 

I made some changes in my idle a/f's and it hasn't acted up since. Before it would idle rich, 12-13, and now it's at 15.5. We'll see what happens after a few more days.