Originally Posted by
RedHeartbeat
did you just notice this or have you looked there before and never saw the sludge? I keep coming back to the way most HHO kits are plumbed, just a solid influx of HHO output no matter what the throttle position. Personally I think running a hose from the HHO system directly into the manifold is bad news because once you shut the engine off its still putting humidity into the intake and there is a hose running from the intake straight into the engine, forcing stuff in there that was never designed to run in an engine. I think the HHO should come into the intake tube before the TB and thats the only place. Any excess stuff can be vented to the atmosphere when not under throttle or engine running.