Emissions Control
Thread Starter
|
New User
Joined: Nov 2006
Posts: 9
Likes: 0
Emissions Control
I can't ssem to find the problem with my 2000 Expy, 4.6L v8. I'm getting a error code of PO400, which indicates "Insufficient air flow - EGR valve". I've replaced the EGR, I've replaced the DPFE sensor, I've cleaned the Trottle Body, I've cleaned the EGR pipe. Any ideas?
Hotshot
Joined: Jan 2004
Posts: 19,763
Likes: 1,081
From: St Louis
Vacuum test the system.
Engine at idle. Disconnect the vacuum line at the EGR valve. Using a short length of hose, connect it to the EGR valve and suck on it. A properly operating valve with clear ports will cause the engine to stumble or die. If it doesn't, remove the throttle body and clean the gummed out carbon from the ports.
EGR valves seldom fail.
Go to the Full-text TSBs at the top of the page and run a SEARCH on your fault code. You'll be surprised on how much dealer data is already here.
Steve
Engine at idle. Disconnect the vacuum line at the EGR valve. Using a short length of hose, connect it to the EGR valve and suck on it. A properly operating valve with clear ports will cause the engine to stumble or die. If it doesn't, remove the throttle body and clean the gummed out carbon from the ports.
EGR valves seldom fail.
Go to the Full-text TSBs at the top of the page and run a SEARCH on your fault code. You'll be surprised on how much dealer data is already here.
Steve
Thread
Thread Starter
Forum
Replies
Last Post
Keith460
Explorer, Sport Trac, Mountaineer & Aviator
5
Jan 15, 2001 01:35 PM
