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98 Ford F-150: my check engine light..throttle body..drove…

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I have a 98 Ford...
I have a 98 Ford F-150 and my check engine light is on and showing a code of 401 I replaced the egr line, egr sensor, DPFE Sensor, pulled apart the throttle body and clean it. it drove about 30 miles and light kicked back on. is there anything i can do to fix this
Submitted: 8 years ago.Category: Ford
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Answered in 55 minutes by:
6/28/2010
Ford Mechanic: EMRSR, Master Certified Service Manager replied 8 years ago
EMRSR
EMRSR, Master Certified Service Manager
Category: Ford
Satisfied Customers: 3,010
Experience: 20 years with Ford, Master Certified
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Have you checked the EGR valve itself with a hand vacuum pump ?
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Customer reply replied 8 years ago
No I have not tried this, but I am not sure how to check the EGR valve
Ford Mechanic: EMRSR, Master Certified Service Manager replied 8 years ago
With a hand operated vacuum pump, you can see if the valve is actually opening. this code is for lack of EGR flow, you need make sure the valve is not stuck or binding and that the diaphragm is not leaking.
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Customer reply replied 8 years ago
I replaced this already could the new one be bad?
Ford Mechanic: EMRSR, Master Certified Service Manager replied 8 years ago
You replaced the valve, you did not state that prior ?
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Customer reply replied 8 years ago
I am so sorry I thought I did I've change so many parts now I get confused to start over I've changed EGR line, EGR Valve,DPFE sensor, and took aprt the throttle body to clean out the carbon build up
Ford Mechanic: EMRSR, Master Certified Service Manager replied 8 years ago
New hoses to the DPFE ??? I will be back in about an hour...dinner break
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