KeithRMelb
New Member
My van's back from having the flywheel replaced under warranty and from having the intake manifold replaced under warranty, but now I have a new odd sound. Once the van is fully up to temperature I get a strange intermittent knocking/thumping at idle that sounds to me a bit like water boiling near the intake manifold, like the system hadn't been bled properly when the manifold went back on. It's a slow non-metallic thump completely unrelated to engine speed, that can be heard from inside the van and from outside the van. Moving around the engine bay it appears to be from somewhere close to the intake manifold, ie, back upper engine. Oil level is good, coolant level is good.. I have video
You can actually hear the noise stop during the recording..
