Re: EGR problem

Posted by 4Crawler on August 26, 2008 at 16:52:51:

In Reply to: EGR problem posted by Rob on August 26, 2008 at 16:42:37:

: '94 4x4, 22re, 155k, mods: headers, cam, exhaust

: Just wondering where the exhaust gas enters the system before it reaches the EGR valve. I suspect I have a blockage before the gas gets to the EGR valve. Any ideas on how to confirm that suspicion and clean it?

: EGR valve works perfectly well and has been cleaned, yet no gas is getting to the intake when the valve is open.

: Thanks in advance for any advice.

Pull off the exhaust manifold and see what the EGR ports look like. Bl0w air through them and out the EGR side to see if it flows OK. I used some gun cleaning solvent to clean mine out, sprayed it into the passages and let it sit a while then bl0w it out (put something on the intake/EGR side to catch the black soot.

Not sure what headers you have, but with my LC Engr. headers, I found the little web of exhaust gasket material between the main and EGR ports had a buildup of soot and that plugged most of the passage. I got a new gasket and cut out the web of material there and also ground the welds inside the header flange to smooth the flow of exhaust gas back to the EGR ports. All that gave me about a 60% reduction in NOX out of the tail pipe.

Follow Ups:

• Re: EGR problem Rob 05:23:29 08/27/08 (1)
  • Re: EGR problem 4Crawler 07:24:49 08/27/08 (0)

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Comments:
: : '94 4x4, 22re, 155k, mods: headers, cam, exhaust

: : Just wondering where the exhaust gas enters the system before it reaches the EGR valve.  I suspect I have a blockage before the gas gets to the EGR valve.  Any ideas on how to confirm that suspicion and clean it?  

: : EGR valve works perfectly well and has been cleaned, yet no gas is getting to the intake when the valve is open.

: : Thanks in advance for any advice.

: Pull off the exhaust manifold and see what the EGR ports look like.  Bl0w air through them and out the EGR side to see if it flows OK.  I used some gun cleaning solvent to clean mine out, sprayed it into the passages and let it sit a while then bl0w it out (put something on the intake/EGR side to catch the black soot.  

: Not sure what headers you have, but with my LC Engr. headers, I found the little web of exhaust gasket material between the main and EGR ports had a buildup of soot and that plugged most of the passage.  I got a new gasket and cut out the web of material there and also ground the welds inside the header flange to smooth the flow of exhaust gas back to the EGR ports.  All that gave me about a 60% reduction in NOX out of the tail pipe.



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