C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

How do fix a blocked EGR passage

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Old May 31, 2008 | 12:59 PM
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Default How do fix a blocked EGR passage

The EGR passage way is blocked inside the intake, I have the intake off but cannot find a way to get to the section that is blocked.

TIA
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Old May 31, 2008 | 01:35 PM
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Try pouring some Seafoam in and letting it soak to dissolve the crud in there. Also, compressed air might dislodge some of the loose stuff.
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Old May 31, 2008 | 01:52 PM
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Originally Posted by GKK
Try pouring some Seafoam in and letting it soak to dissolve the crud in there. Also, compressed air might dislodge some of the loose stuff.
Do both
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Old May 31, 2008 | 02:36 PM
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Seafoam did the trick with some help from a heavy duty wire I had.

On another note, every one of my intake bolts were either loose or barely snug, the front and back of my engine are covered in oil. There was so much oil covering both sides of the intake gasket, that I did not have to pry to take the intake off and the gasket just came right off.
So if your car is running poorly like mine, check the intake bolts to make sure they are bolted down correctly.
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Old May 31, 2008 | 02:51 PM
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Originally Posted by Randy93
Seafoam did the trick with some help from a heavy duty wire I had.

On another note, every one of my intake bolts were either loose or barely snug, the front and back of my engine are covered in oil. There was so much oil covering both sides of the intake gasket, that I did not have to pry to take the intake off and the gasket just came right off.
So if your car is running poorly like mine, check the intake bolts to make sure they are bolted down correctly.
That is common. Probably the last intake R&R was not re-torqued after a heat cycle. I have never had to pry a LT1 intake off if it was leaking enough oil gets everywhere.
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Old May 31, 2008 | 03:22 PM
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Dont I know that!!!!!!!!!!!
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Old May 31, 2008 | 11:38 PM
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I took my intake to the car wash before I took it to a shop to get chemical cleaning, and also after I took it to a shop. Even after the shop cleaning, I got quite a bit of carbon out of the passages.

Put the hi-pressure wand in every passage - TB bores, temp sensor opening, 2 ports on passenger side, 3 EGR ports on the back, 2 PCV ports + another on the driver's side, and also ALL the bolt holes. Pull the baffle off the bottom, and go there too.

I would NOT use 'wash', rather 'rinse'. You can't dry out the ports, and soap is like gum when it dries - window tint glue, tire mounting, etc.

Last edited by schrade; May 31, 2008 at 11:40 PM.
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