I bought the truck with a oil leak at rear drivers side on the head. The injector harness infamous leak. The truck started misfiring and threw code for injector 4 5 6 so I got volvo to put a new harness in and do a overhead while it was apart.
After I took it and it drove fine until I loaded then it started misfiring again and this time injector 1 2 3. The volvo mechanic checked connections and verified continuity and is all well, he said he doesn't really know what it could be.... he said maybe the ecu is buggered.
Has anyone been through anything like this or have any ideas I can pass on. I told him to test the injectors. He said he will but he doubts it as 1 2 3 would have come up the first time. I also told him to re clean all clips and connections on the outside of the engine incase some oil is sticking in a plug.
Thanks for your help