Outer Limits 4x4 Board

Hi guys

I have a 1991 1HD-T with 355000 on the clock. I took it for a drive today and noticed when I was stationary, the rpm would be on 0. But when got moving again it would jump up higher. Sometimes it would flick from 0rpm to higher rpm. The engine is not playing up at all.

Any help to diagnose the problem would be great.

not 100% sure where the tacho pichup is from some are from the fuel pump others can be from the alternator

ledgend80 wrote:not 100% sure where the tacho pichup is from some are from the fuel pump others can be from the alternator

I thought pump

tacho pickup is in the injection pump between the pump and the block. I'd check all the wiring connections before I took the sensor out.

Cool thanks guys. Will look at it today.