GX 470 Manifold Replacement (1 Viewer)

[midwestgxer]

Hi All,

Long time lurker, first time poster. I have a 2004 GX470 that has the infamous exhaust manifold tick and just recently started throwing P0420 and P0430 codes. Long story short, I have decided to replace the manifold converters with units from Eastern Catalytic.

I am not a novice wrencher by any means. I have done timing belts, valve cover gaskets, intakes, suspension upgrades, etc.

I am curious if anyone has replaced the manifold/cats on their 120 series, and if so, what are some of the gotchas to look out for?

This GX was my wife's daily driver until a couple of weeks ago when we got her a 2015 GX460 so I do have the liberty of pulling it into the garage and working on it as I feel like it. Just yesterday I soaked all of the flange bolts with PB Blaster and will do so again before I start removing anything.... currently planning to start the job this weekend.

Should be fun!

 

[Squirrelmaster]

I’m afraid I’ve got nothing to add here except that my drivers side manifold recently started leaking, so I too would love some tips on replacement. Thanks to anyone who has some advice!

 

[CarolinaGX]

I am still trying to determine if mine need to be replaced or not. If so, I plan to use the DT headers and build an exhaust that is tucked up inside the frame rails to improve clearance.

 

[GXO]

Broken studs. Buy new studs before you start. Get all 16 just in case. That is your biggest risk.

Other than that, I suggest finding someone with very small, strong hands.

 

[scmcna]

I am still trying to determine if mine need to be replaced or not. If so, I plan to use the DT headers and build an exhaust that is tucked up inside the frame rails to improve clearance.

are D Thorley headers even made now? They have had “out of stock” post on website