So I’ve got a constant hissing noise while the rig is running and it continues a second or two after the rig is shut off. It sounds as though it’s coming from under/inside the intake manifold. It could have been there since I’ve had it for all I know. You gotta have your head pretty close to the upper intake to even hear it.
EGR is completely gone with block off plates and every vacuum port is capped. Charcoal canister is also gone. Brake booster is brand new OEM from a different issue. PCV grommet and all hoses are new in the last 3 months including the big intake hose. I’ve pulled the booster hose and temporarily capped it to eliminate that as a cause. Before I pull the upper intake, Are there any other ports underneath there that could be leaking?Suggestions are welcome. The rig runs great with zero problems. Just this weird noise.
EGR is completely gone with block off plates and every vacuum port is capped. Charcoal canister is also gone. Brake booster is brand new OEM from a different issue. PCV grommet and all hoses are new in the last 3 months including the big intake hose. I’ve pulled the booster hose and temporarily capped it to eliminate that as a cause. Before I pull the upper intake, Are there any other ports underneath there that could be leaking?Suggestions are welcome. The rig runs great with zero problems. Just this weird noise.