Kenneth White
New member
At start up one day I noticed a pressurized air sound comimg from the intake manifold. I was able to isolate it to the 4/5 port of the intake manifold and it was a rythmic pressure sound that picks up speed with RPMs. Even at cold start up I do not see exhaust smoke and the engine did not overheat so I dont think it is exhaust leaking. After completing a compression check all checked out at 380 to 420 with the 4/5 being 400 and 410. All 6 cylunders are firing and the motor runs smooth and normal other that the sound. Has anyone seen this before and is it possible to have these compression numbers and still get some blow by through the intake valve creationg this sound???? Thanks