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Old 09-28-2011, 06:25 PM   #1 (permalink)
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My 2004 Mazda 6s cel for egr keeps coming back on. The codes are p2227, p1487, and one more egr related one I forgot. I cleaned the egr valve cel came back on 80miles later. Replace egr boost sensor cel came back on 20 miles later. I then got a new egr valve and installed it, cel came back on 68 miles later. There are no vacuum leaks, and every time the cel comes back on it's the same codes. I'm going to clean the IM tomorrow and if that doesn't work I don't know what else to do. I live in an emissions state so I can't delete it either. I read about rerouting the egr but I rather see if I can fix it, but that's not out of the question if recommended by you guys and gals. Anybody have any advise or suggestions? Thanks in advance.
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Old 09-29-2011, 08:19 AM   #2 (permalink)
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Just a FYI, I had a similar issue with my EGR and replaced it. Not long from that point I had rear upper O2 sensor go on me. Shortly after that I finally got a CAT failure code. Ends up my front Cat was clogged and the engine shot out the #4 spark plug and coil from the head. Like I said just FYI, you may want to just check thru things.

This was all on a 05 6S with 170k on it.
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Old 09-29-2011, 08:33 AM   #3 (permalink)
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I am having the exact same issues with my '04 6s with the same codes. I have Nautilus headers so I know it's not a cat problem, at least not with the upper cats since they are no longer there. I have new cats after the headers so I wouldn't think that would be the problem unless it's an O2 sensor issue. I have also done the EGR re-route and I've checked for vacuum leaks several times. Thought about replacing the EGR Boost Sensor but since it didn't work for Numbers then I probably won't bother. The last time I was getting these codes the EGR pipe inside the manifold had collapsed completely flat so there was no flow. I replaced it but now I am having the same symptoms. I have not checked the pipe yet but will this weekend.
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Old 09-29-2011, 11:05 AM   #4 (permalink)
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I just checked my IM and it is clean, the pipe is dirty but nothing to inhibit airflow. The only other thing I can possible think of is a bad solenoid valve sensor but I doubt it. The o ring around the IM that connects the egr is in good shape too. I don't want to go somewhere where they are going to do everything I did and charge me for it and not fix the problem.
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Old 09-29-2011, 12:17 PM   #5 (permalink)
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Probably something in the EGR tube blocking it up.

take the thing off and clean it out.
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Old 09-29-2011, 12:35 PM   #6 (permalink)
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The tube that goes from the egr to the exhaust manifold? The part of that tube that connects to the egr wasn't clogged but I didn't check the exhaust manifold end of it. It looks like a B to get to the exhuast manifold part of the tube, but it's def worth a shot. Thanks for the help.
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Old 09-29-2011, 02:35 PM   #7 (permalink)
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Have you tested all the wiring with a volt/ohm meter? The manual indicates this either a blockage in one of the small rubber tubes or a wiring/connection problem.
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Old 09-29-2011, 04:06 PM   #8 (permalink)
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I have not checked the wiring, I guess that was too simple of a thing to do first. I really hope it is wiring because I don't know what else it could be. Thanks
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Old 09-29-2011, 04:24 PM   #9 (permalink)
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All wiring works both sensors work. What about a fuel cleaner, would that work the gunk off of the exhaust manifold?
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Old 09-29-2011, 09:02 PM   #10 (permalink)
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Does the egr valve actuate with voltage applied?
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