Hello,

I am having trouble with my K20Z3 swapped into Del Sol. I think it has something to do with tuning (Hondata). It idles fine and when driven hard (WOT) it seems to run nice. The issue it has is when throttle is partially open/feathered the engine cuts in and out. It does this both when under load and when it is not under load. I thought the TPS may be on it's way out so I bought a new one and it made no difference to the behaviour. Engine temperature does not seem to make difference either, it does it when both hot and cold (though it seems to be a bit worse when hot).

I have recorded a datalog when the issue is occuring. In the recording, I am holding down the throttle partially and not moving it but you can see the RPM are all over the place. Any help would be greatly appreciated!

 

Have you verified that all the sensors read correctly with the car turned to on, without the engine running? On a different note, your car is cutting from closed loop into open loop and variating between open-driving and open-cold. To start, I'd go with verifying all the sensors on the car. For saying that you're holding down the throttle "partially and not moving it", your TPS readout sure doesn't reflect it - 0% most of the time with peak at 4%.

 

Sounds like DFCO(Decel Fuel Cutoff) Your tps is either adjusted wrong, crappy throttle body sticking problems, or the tune has bad settings put in.