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Old 08-05-2011
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EGR system cleaning - do i have to?

Hey all,
99 Mazda b25, 140k. Got a CE light yesterday, had it scanned and got the P0401 code, insufficient flow through EGR valve. I bought the valve and it looks like an easy swap, the valve is just sticking out the top of the TB. However i had the same thing happen to me on a 4.6 crown vic which required completely dissasembling the entire EGR system, intake mani and throttle body and cleaning out these channels that were full of carbon crud. On that engine some of it was really hard to get at, lots of sweating and cursing, took some time but was the real root of the problem, not the valve. Anyone ever take on this job in a 2.5 4banger? Any advice like special tools needed, tricky bolts, etc would be great. Thanks guys.
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Old 08-05-2011
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I cleaned the throttle body and upper intake when I changed the spark plugs. Nothing really tricky or hard, you just have to use some long extensions on the bottom two bolts of the throttle body. I don't really remember any hard to get to nooks or crannies, I would try to replace the egr gasket when you are doing it because they can flake apart when you disconnect the valve. Use a good scraper to get the gasket material off.
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Old 08-05-2011
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Replacing the egr valve is really easy. Remove the rubber hose on top, loosen the nut that connects the valve to the egr tube (pipe coming out the bottom), remove the two bolts holding the valve on, then put the new one on and follow these steps in reverse. Make sure you have a gasket.
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Old 08-06-2011
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thanks guys. Funny thing, driving out to the range the other day i got on the gas to pass someone and the CL light went off! i guess something was stuck in the valve and it got blown out at WOT. So ill hang on to the valve and gasket i bought for a bit and see if it come back on, but i;m gonna let it ride for now.
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Old 08-06-2011
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There may have been something stuck in the valve and might have gotten sucked out
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Old 08-08-2011
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Damn light came on again this morning, guess my luck was only temporary. I'll be putting the new valve in tmrw, thanks again.
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Old 01-24-2013
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hey did you end up putting the valve in? i cleaned mine and it didnt work for releaving the p0401 code. Is there a way to check the vacuum hose? mine seems to be lacking suction.
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