Miky Posted February 19, 2021 Share Posted February 19, 2021 Anybody know why the #2 intake port would look like it has never been used while the others look like they have 150,000mi on them? I am replacing the intake gasket because of a vacuum leak and noticed this. The cylinder has been misfiring. There is no coolant in the oil. I'm not sure what the clean port is indicating. 1999 Mazda protégé 1.8L. Quote Link to comment Share on other sites More sharing options...
Jim Posted February 19, 2021 Share Posted February 19, 2021 The black material is from the crankcase which comes through the PCV system. I cannot tell from your picture but most likely because the fuel injector is spraying into the area and cleaning away the deposits from the crankcase. The other cylinders the fuel injectors may not be spraying directly into the head. With the fuel injector spraying into the valve area it is amazing how clean they stay. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.