Ok I'll get the injectors looked at then. Is there a way of doing the ECU relearn myself or does it need to be a mechanic with a special gizmo? The heat function is nothing to do with the radiator, it's a preheat of some sort which helps it idle better in cold conditions, whethers it's glow plugs or ...

Hi guys, So I have a 96 Nissan Terrano with TD27T engine. It idles rough all the time at around 650 RPM, unless I select the HEAT switch and then it idles at around 1100 RPM until it gets up to temp and the heat function automatically turns off. When under braking and decelerating with the heat ...