Petes93cutlass Posted January 30, 2014 Report Share Posted January 30, 2014 I have a 1993 Olds Cutlass 3.4 DOHC. I have been getting codes for the EGR. I removed the Egr and tried to scrape out the Carbon buildup in the plenum. I poured water into the EGR port and it just fills up when I think it should be an open port leading back into the plenum for the egr gases to burn off. Has anyone run into this problem and how did they unclog it? Quote Link to comment Share on other sites More sharing options...
Schurkey Posted January 30, 2014 Report Share Posted January 30, 2014 Poke a semi-flexible wire into the hole. Ideally, with a vacuum-cleaner nozzle nearby so the chunks don't drop into the manifold, but get sucked back out of the port. Once you get an open pathway, you could try to solvent the carbon out with aerosol carb cleaner. (I would remove the upper plenum for thorough cleaning. The only times I've cleaned that port was with the manifold removed.) Quote Link to comment Share on other sites More sharing options...
Petes93cutlass Posted January 30, 2014 Author Report Share Posted January 30, 2014 I tried using a wire already. is there some type of solvent I can flood the port with that would desolve it? Quote Link to comment Share on other sites More sharing options...
redgrandprix Posted January 30, 2014 Report Share Posted January 30, 2014 rifle brush from a gun cleaning kit after removing intake Quote Link to comment Share on other sites More sharing options...
Schurkey Posted January 30, 2014 Report Share Posted January 30, 2014 I tried using a wire already. is there some type of solvent I can flood the port with that would desolve it? you could try to solvent the carbon out with aerosol carb cleaner. ^^^ Quote Link to comment Share on other sites More sharing options...
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