EGR system cleaning - do i have to?
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.