Intake manifold buildup

[turbo_dsm]

My intake mani has some heavy buildup, is there anything that is causing this? i bought the car with a blown head gasket and fixed that. Any suggestions? thanks

 

[SupaDoopa]

Could be a bunch of things. Is the car running fine? I'm just concerned there isn't any build up elsewhere stealing performance from you.

 

[turbo_dsm]

The car idles bad but pulls pretty well for a stock turbo. I cleaned the Tb and about to put a new gasket since the old one was leaking. My ISC has to be replaced and it should run fine.. idk why there is so much buildup..

 

[2gGSXEclipse]

Do you have an EGR? If so this is normal from the EGR throwing already burnt gas back into the intake manifold.

 

[LiquidX]

That build up is caused by the EGR system. That's carbon/oil and whatever else is in your cylinders coating the walls. The best thing to do is thoroughly clean it out with degreaser and remove the EGR valve.

 

[turbo_dsm]

okay so is this normal in a car with 170k miles?

 

[Detective Coating]

Most definitely normal. I've powdercoated 4 intake manifolds in the past week and just took the sandblaster to it to clean them out and they look good as new. As said before it's because of the EGR doing it's job.

 

[LiquidX]

So with that being said. Does it hurt your motor or performance to remove the EGR valve or what is the point of an EGR removal?

The purpose of the EGR valve is to recirculate the exhaust gasses when certain criteria are met. It is used to lower NOx (?) for emissions by adding in partially/burnt exhaust into the cylinders as an incombustible gas to fill the place of air. It will cool the cylinders a little bit and will re-burn the unburnt fuel in the exhaust mixture that got recirculated.

It will not affect your motor removing it other than allowing your intake manifold to stay clean.

You need the EGR for emissions and removal of the system will throw a CEL. People do it to clean up the bay, part of an emissions removal, better efficiency of the intake manifold or for all 3 reasons.

 

[97gst_spyder]

I've also read that its designed to give you better gas mileage. I removed mine and my gas mileage is the same though....