Quote Originally Posted by Hibiki View Post
Stock Isuzu 96 LS 4JA1 Pump. I would like to have it checked kasi mine is using the stock alternator (40amps). I noticed that when the engine is on operating temp, the idle seems unstable. Parang kinakapos. I was thinking that kasi the pump is really old, maybe the wirings or output voltage is no longer in specs.

Thanks Dieseldude
The throttle potentiometer does not have any effect on the injection pump's performance. It is mounted on top of the pump's throttle shaft to monitor throttle position for EGR (Exhaust gas recirculation) control and/or automatic transmission shift control.

Blocked fuel filter maybe? Or you may have an injection problem as you car is 11 years old, probably with high mileage as well.

Bye,

Dieseldude