Low impedence injectors without resistor box = damaged p30?

Suzukii · Post by **Suzukii** » Sun Feb 28, 2010 5:04 am

The motor was running some low impedence injectors for a few days without a resistor box. Its on a P30 S300 ecu.

Opened up the ecu and there are no visible signs of any damage.

Now, motor runs crazy rich when vtec is engaged. Like from 13:1 before vtec to 9:1 once vtec engages. In order to tune it back to normal wot AFR of about 13:1 the map has to be adjusted to extremely low pulse width and there is no power.

Seems the engine is dumping the fuel and not igniting well.

Could this be a damaged ecu sending the wrong pulse widths or the distributor coils giving up?

I've not tried a new coil yet. Will report once i get a new coil fitted.

boostedcivicsir · Post by **boostedcivicsir** » Sun Feb 28, 2010 5:41 pm

low imp injectors on a high driver can dammage it. how did it run before and did anything change since that?

Suzukii · Post by **Suzukii** » Mon Mar 01, 2010 4:31 am

The ECU is fine. Tested it on another car and it worked flawlessly.