Another fun one… Peugeot Boxer 1994 running problem & no diagnostic communication. 2500RPM the engine was surging up and down the rev range. On the scope ( blue line in the picture ) was the earth for the crank sensor this had a huge amount of interferance / was dropping. We traced the fault back to sevral earth faults on the vehicle. This was all due to age and corrosion.
First was the chassis to gearbox strap, 2 x ECU earths on the engine block were cleaned, Battery negative cable to […]