K20A2 not cutting injector duty during deceleration

[forryk]

Hey,

So i've had some issues since i installed my new k-tuned 70mm throttlebody.

So the issue started with injectors not cutting out during deceleration, now to add to that the cars fells abit "jerky" during "normal" drving (like backfires).
To start with i calibrated the TPS, didn't help. After that i changed to a known working tps and calibrated it with a multimeter and using k-pro, no improvements....

One of the strange things is that when i start the car cold the injectors will cut duty during deceleration. I also changed the map sensor since i thought the map sensor reading seemed abit funny. I'll attatch logs and the tune.

Overall the car idles good and there's no vaccum leaks.

- RBC manifold
- K-tuned 70mm TB
- PLM header
- K-pro

[forryk]

you can clearly see when it's starts to act out...

[Spunkster]

Is the map sensor located at the bottom or the top of the throttle body?

[forryk]

It's mounted on top

[Hondata]

Check the port to the MAP sensor on the intake side of the throttle body is not blocked by the gasket. Otherwise it is the MAP sensor or MAP sensor wiring.

[forryk]

Yeah I tried a known working map sensor also, didn't help.

I don't get how the car is fine for a couple of minutes and then starts acting out. If I turn it off for 10mins or so it starts working again for a short time.

I also tried changing the iacv and using the factory PRA tune without any luck...

Could it be ECU related?

[Spunkster]

I would recommend that you try the ECU on a known working vehicle and see if the problem persists.

[forryk]

Been driving the car to figure out what's going on. So today when i pulled up to the parking my map sensor was flapping up and down as in the logs i posted. So i hit the throttle to test my launchcontroll, after that the map reading went back to normal.... :O

Any ideas? Also relocated all my grounds except the gearbox one to the valvecover.

[Spunkster]

It could be a wiring related issue or the map sensor itself. You really need to try this in a different vehicle to help you determine where the issue is.

[forryk]

ECU tested in another Ep3, no issues what so ever. Tried with my map sensor also.

The car has had an PRB ecu before and now running the PRA. Could there be some wiring issues since it looks like it's still cabled for PRB lambda?

Any suggestions?

[Spunkster]

If it is a wiring related issue, it will be complicated to find, but I would start with anything that has been moved, modified or damaged.