Gheremy H

Here goes nothing. I have a 4th gen prelude h22a swap chipped p28. The the issue im having is on cold start up, the engine bogs when giving it gas. After its warm, its drives fine below vtec, once i get to hi cam, you can feel and hear it activate but it bogs and sputters/hesitates. Its a major break up in in power. Im thinking, solving the bogging at cold start up, will also clear up my vtec sputtering issue. What could possibly be causing my issue?
h22a
New distributor
New injectors
Kemso 340 lph fuel pump
New fpr
New plugs
New wires
New etc sensor
New vtec solenoid gasket.
Pretty much all new since its a fresh build
Head is the newest with not even 50 since it was fully decarbonized with new seals, valves, springs, etc.
timing is good i set it up when motor was out of the car and spun it plenty of times and marks lined up. Im just stumped. Help???

H23a92lude

Hey man did you ever fix this problem? I did a h23a PDE swap and it ran GREAT on a basemap from HAmotorsports and I went and go it tuned and instantly when leaving the shop my car started doing this. Before it had NO problems cold start, NO sputtering in vtec. Now literally the same issue as you RIGHT after the street tune.

Gheremy H

Ended up being low compression

H23a92lude

I guess I’ll check mine again before I went to get tuned it was 190psi COLD across the board. I feels like it’s throttle related though especially since it drove perfect fine for months on the basemap and then started acting like this RIGHT after the tune

Gheremy H

My bad man. I was thinking of a totally different h22 I had. This was long ago. This issue was after my swap, good running motor. Ended up being my fault. I installed a 340 lph fuel pump on stock fuel regulator. After installing an adj fpr I seen my fuel pressure was too high. That was my problem. I turned down the fuel pressure. Stock regulator couldn't handle the bigger flow

H23a92lude

Thanks man! I’m still on stock pump and stock h22 injectors. Feels like the tps calibration that he did is off? In the Ecu? With my multimeter I set it right on .5V so idk. Taking it back to him next Friday