Hello all, I'm usually in the background absorbing all the great info my brain allows.

Anyway, on to my problem here. Crossing into vtec with very light throttle my car hiccups as if I'm low on oil or have a clogged vtec solenoid, which neither is the case.

If someone could take a look at the log of this happening you'll see my rpm jumps from about 3500rpm to 7xxxrpm in the log. It happens twice. It doesn't happen when @ Wot. My car has been street tuned by a reputable tuner here in RVA. Now, I know most would say take the car back, but I would like to figure this out with the help from HT first.

On Low cam map -10.2psi column timing jumps from 39.75* to 42* then back to 39.75...(I am not an expert in this area) But I do believe this is my problem. What are you thoughts



Setup: NeptuneRtp
Stock Ls/vtec B16/b18b1
street tuned 12psi t3/t4 50tim
3bar- walbro255-450injectors
2.5downpipe 3" Cat back

Thanks in advance anymore needed info Please Let me know.

 

What wideband are you using the o2 input jumps around alot in you log file.

 

OK... forget what I said on my forum... this has nothing to do with VTEC crossover because you're not crossing over into VTEC. Simply check your low cam fuel and timing in the area of the event and then change it as necessary to correct the issue.

Next... you're running extremely lean with stock closed loop targets, or so says your +12% short term and +19% long term. That might be your problem right there.

On another note disable the staged Boost Control via the checkbox as you're not actually using it whatsoever.

 

I'm running a Mtx-L.. @HRt..I was bit confused for second as this issue did happen before the crossover. My lean condition has been fixed(had a leaky ex manifold gasket).

Disabling boost control. Ok ..I thought Enable Boost Control had to be Checked in order for PWM to work. I guess not.

I'll get another log done being that the leaky gasket was given false readings.

 

Im sure its your fuel pressure as hr tuning said I had a hiccup problem that lasted a year an I did so many changes in fixing things which needed to be fixed anyway finally one day I turned the fuel pressure up on the regulator and it went away