20-03-2014, 12:48 PM
The blue when starting is possibly valve stem seals or poorly injectors... Poorly combusting Diesel can manifest itself anywhere from bright white to blue to thick black depending on the stage of combustion when it went out the exhaust...
The hunting is typical of all HDis - it's the ECU trying to compensate for changes in engine speed and smooth it out but doing so badly... It's especially noticable when you have a free'r exhaust, you really hear the injection quantity adjustments the ECU is making as "lumps". Injectors may help it a little as it's not trying to compensate for each injector as much.
Let us know how you get on
The hunting is typical of all HDis - it's the ECU trying to compensate for changes in engine speed and smooth it out but doing so badly... It's especially noticable when you have a free'r exhaust, you really hear the injection quantity adjustments the ECU is making as "lumps". Injectors may help it a little as it's not trying to compensate for each injector as much.
Let us know how you get on
