Vtec help over 4000 rpm

[jonatan riaño]

when I start the car for the first time at normal temperature if I accelerate fully from low rpm the vtec works fine and the next time it stops working and sputters if I remove the key and put it back in it works again but if not the car pitches a lot and It won't let me go over 4000 rpm making explosions


Its only at vtec engage

The car k24a3 with oil pump k20a2

[Spunkster]

Post the calibration used and a datalog showing the issue.

[jonatan riaño]

sorry spunkster the datalog and bin are there look minute 2:54 vtec fluctuate

[jonatan riaño]

HELP PLEASE!

[Spunkster]

I see the VTS activating as the parameters are met in the datalog.

[jonatan riaño]

yes, that's true but the car sputters if you look at the tps it's at 100% but the car doesn't go up in rpm at the moment and it knocks

[Spunkster]

Have you checked the oil level?

[jonatan riaño]

Yes and it is at the maximum, I would rather say that it is higher than the maximum.
Its k24 with oil pump k20a2

[Spunkster]

Check your grounds and it could be grounding through the VTEC solenoid and that will cause it to rev limit when VTEC engages.

You should try the ECU in a known working vehicle and see if it operates normally with your ECU. Use the calibration for the vehicle you are testing in.

[MondeCruel]

look your map value is going up and down maybe check that, you dont have o2 sensor ? it is check in parameters, also you 30dg high speed fuel table

[jonatan riaño]

Where do you say it goes up and down? in what minute to be able to observe and the map was good, the O2 sensor started doing it recently, it does work, I don't have afr because it is PRA

[MondeCruel]

must be a bug i see map going up to +200kpa then drop to -10kpa in loop