Help us help you. By posting the year, make, model and engine near the beginning of your help request, followed by the symptoms (no start, high idle, misfire etc.) Along with any prevalent Diagnostic Trouble Codes, aka DTCs, other forum members will be able to help you get to a solution more quickly and easily!
P0401
5 years 1 week ago #28745
by Tyler
I think your best plan is to remove the EGR valve and possibly the upper intake plenum, as in the plastic part of the intake that the throttle body bolts to. That'll give you access to both ends of the EGR passages. Be sure to buy gaskets for the EGR valve, the plenum AND the o-ring that goes around the injector connector.
That said, are you sure you're dealing with plugged passages? :huh: Because I've had the lower intakes off of these engines many times, and never found their EGR passages to be even remotely plugged. This is probably the only EGR system that never really suffered from severe plugging.
Usually, I find that a.) A piece of carbon from the exhaust found it's way to the EGR valve, or b.) Someone installed a 'screened' EGR valve gasket, and that's become plugged. I've also seen the EGR tube from the exhaust break in two, but that's less common.
In all three cases, it might be as easy as pulling the valve off for a visual inspection.
That said, are you sure you're dealing with plugged passages? :huh: Because I've had the lower intakes off of these engines many times, and never found their EGR passages to be even remotely plugged. This is probably the only EGR system that never really suffered from severe plugging.
Usually, I find that a.) A piece of carbon from the exhaust found it's way to the EGR valve, or b.) Someone installed a 'screened' EGR valve gasket, and that's become plugged. I've also seen the EGR tube from the exhaust break in two, but that's less common.
In all three cases, it might be as easy as pulling the valve off for a visual inspection.
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5 years 1 week ago #28752
by Tyler
Oh yeah, you'd get a P1404 or P1406 if the pintle wasn't performing. But I've seen carbon chunks big enough that they don't go into the valve, but obscure the port enough to cause a P0401.
All the more likely if someone installed a 'screened' valve gasket. Like this:
www.amazon.com/Dorman-47007-Screen-Gaske...rtment/dp/B000CSZHA8
All the more likely if someone installed a 'screened' valve gasket. Like this:
www.amazon.com/Dorman-47007-Screen-Gaske...rtment/dp/B000CSZHA8
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