Poor running on VTEC ECU after h22a conversion FIXED!
Posted: Fri May 19, 2017 9:55 am
So as some may know I've done a h22a engine conversion on my bb2 (h23a1 non VTEC) and I'm having some issues..
The car runs spot on and pulls well but smokes badly on the p14 (h23a1) ECU also get oxygen sensor fault code as expected..
When putting the p13 ECU in the car idles fine but is very under powered and jerks and hesitates under partial load or cruiseing..
Getting faults for:
VTEC solenoid (expected)
Oxygen sensor heater
Knock sensor
(I understand that my car is not wired for VTEC but wasn't expecting it to run so bad on the ECU that's correct for the h22...)
So I swapped the oxygen sensor tonight, the old one had completely broken off so was hopeful of a fix but no good..
So the only thing I can think of is that the knock sensor fault is the cause but I don't understand how it runs so good on the other ECU as that has a knock sensor as well and I'm sure they both go to same pin on the ECU??
I'm certain the car should run fine without VTEC wiring and unless the two ECU's have different pins for knock sensor I can't understand why it's so bad..
If anyone knows if the knock sensor pins are somehow different on the two ECU's or has done a VTEC swap and has experience with this would be a massive help
Also if anyone has a reliable source for ECU pin outs for 4g prelude ECU's would be great..
I'm hoping to try wire up VTEC solenoid and figure out the knock sensor tomorrow but if someone can point me in the right direction of some reliable pin out info I'd be very appeciative
EDIT: could the knock sensor wires be in different locations at the shock tower connectors where engine loom plugs into chassis/dash loom?? I'm using the h22a engine loom plugged into the h23a1 chassis/dash loom by the way..
The car runs spot on and pulls well but smokes badly on the p14 (h23a1) ECU also get oxygen sensor fault code as expected..
When putting the p13 ECU in the car idles fine but is very under powered and jerks and hesitates under partial load or cruiseing..
Getting faults for:
VTEC solenoid (expected)
Oxygen sensor heater
Knock sensor
(I understand that my car is not wired for VTEC but wasn't expecting it to run so bad on the ECU that's correct for the h22...)
So I swapped the oxygen sensor tonight, the old one had completely broken off so was hopeful of a fix but no good..
So the only thing I can think of is that the knock sensor fault is the cause but I don't understand how it runs so good on the other ECU as that has a knock sensor as well and I'm sure they both go to same pin on the ECU??
I'm certain the car should run fine without VTEC wiring and unless the two ECU's have different pins for knock sensor I can't understand why it's so bad..
If anyone knows if the knock sensor pins are somehow different on the two ECU's or has done a VTEC swap and has experience with this would be a massive help

Also if anyone has a reliable source for ECU pin outs for 4g prelude ECU's would be great..
I'm hoping to try wire up VTEC solenoid and figure out the knock sensor tomorrow but if someone can point me in the right direction of some reliable pin out info I'd be very appeciative

EDIT: could the knock sensor wires be in different locations at the shock tower connectors where engine loom plugs into chassis/dash loom?? I'm using the h22a engine loom plugged into the h23a1 chassis/dash loom by the way..
