Rust inside the Intake Manifold!
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Rust inside the Intake Manifold!
I recently pulled off my intake manifold for a cam change and I shined a light in it just out of curiosity and is appeard to be rusted all over the inside. I then checked my throttle body and the back of the fins (I have no clue what they are called, the things that open and close the tb) were also rusted. Does anyone know if this is normal, if now what causes it and how to fix it? Thanks guys.
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Rust inside the Intake Manifold! (mn_vette)
Do the TB coolant bypass the gasket below the TB may be leaking.
The intake manifold rust may be due to coolant leaning inside the base.
The intake manifold rust may be due to coolant leaning inside the base.
Le Mans Master
Joined: Jul 2001
Posts: 8,183
Likes: 3
From: Santa Maria, CA
Re: Rust inside the Intake Manifold! (mn_vette)
The round throttle blades(2 of them)? Rust/oxidation isn't normal. A coating of oily residue would be quite normal for these motors. Try seeing the gaskets in the throttle body(3 of them). What condition? Bypass the throttlebody coolant lines.
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Re: Rust inside the Intake Manifold! (89 Paul in cal)
ok, a tb bypass, not a problem, but wouldn't that have done something really bad to the engine if it was sending antifreeze through the engine? It did cause the entire inside of the intake to rust, top, bottom, sides, all of the surface on the inside is covered in rust. I wouldn't think a coolant leak would do that, but I could be wrong.
Thread Starter
Melting Slicks
Joined: Jan 2002
Posts: 3,293
Likes: 79
From: Jackson MI
Re: Rust inside the Intake Manifold! (skidmark)
Have you modded the air intake? Some aftermarket systems can allow rain to enter the intake.
