Peter Giljevic Posted November 19, 2009 Report Share Posted November 19, 2009 Hello, I am posting up here as a last resort. I have had a constant/persistent problem with my 13B-REW engine running Siemens 87lb/hr primary injectors. Outlined below. See linked video. http://www.youtube.com/watch?v=FWMbeOQhL2U ^ Now no matter how any cell is set or those surrounding them the car always wants to on return to idle go lean (as shown in video) then it will catch on and go to the tuned or set fuel mixture. This problem happens to such a degree that the only way it is solved is by doing a stupidly rich fuel setting like 10.5:1 to counter the temporary lean stage/spot. I cant emphasis enough that all cells are tuned 100% correctly and when the car transitions through any one of them it operates ok. Its only on a trailing throttle as shown in video where the car wants to stall. When decel fuel cut is enabled the problem is 100 times worse and the engine will not fall back to an idle at all when decelerating and the clutch is depressed when coming to a stop. I need to add, I have tried the Link supplied resistors, I have also tried a peak and hold injector driver box from FJO. Both have same problem. After much discussion with my local distributor he told me to play around with the injector lag time values and by increasing these to +30% over normal it slightly improved the situation but it is still unacceptable as in the video. All fundamentals have been checked and can be viewed in video supplied, EGT front and rear rotor, fuel pressure, AFR ratio, you name it and double checked against different equipment. I am at a loss and need some explanation of what can cause this to happen. Oh and to add, does not matter if idle stepper motor is disconnected and idle speed set to virtually ANY rpm manually (even 2500rpm) the ECU still exhibits the exact same problem of temporarily going lean when trying to sit on the idle speed set point when returning from higher rpm............ as you can imagine it is very frustrating and confusing. Best Regards. Peter www.riceracing.com.au Quote Link to comment Share on other sites More sharing options...
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.