Insuffient EGR Flow
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Insuffient EGR Flow
Now I've got another code for insuffient flow at the EGR. I put in a new EGR and Tube that runs to the manifold. Is there something else in the equation that I've missed? EGR solenoid or something.
thanks
thanks
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Joined: May 2002
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Hey there. You might have the dreaded plugged egr ports, or might be the DPFE sensor, or the vacume solinoid for the egr valve. If you put vacume on the egr valve plug, does the engine stumble or try to stall? at idle. If it does not, the ports might be plugged up. You need to remove the throttle body to intake elbow and clean the ports good. I have not seen many egr valves go bad. What motor do you have , and the miles on it? Good luck
Dave P
Dave P
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I have the 4.6 8 cyl. it has 217000 miles on it. (and proud). I put a new egr on and did a search and according to what I found there is no vacumm solenoid on it. The only thing I found is a egr positioning solenoid
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I can almost gaurantee it is clogged ports behind the EGR. It happened on mine and like you I chased the problem and replaced the EGR and the DPFE sensor. Ford says not to clean the throttle body but in this case you have to. When you remove the throttle body from the manifolde you will notice 2 ports directly behind the EGR that go down into the bottom of the throttle body and then go straight up at about a 70 degree angle. It is in that elbow you will find the clog. Hope this helps good luck.
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From: Royal Palm Beach, Fl
P0401
I suffered through the same problem with code P0401. You did not say what year. I changed the ERG Valve and the PDFE switch and it did not fix it. I finally fixed my 98 4.6L F150 with 112,000 miles by cleaning the ERG ports. The ports I'm speaking of can only be accessed my removing the throttle body off the top of the intake manifold. It's an elbow that connects most of the vacuum lines including the ERG Valve. I got a lot of carbon out of there using a drill bit by HAND and that fixed it. There is a simple test to tell you if the ports are clear.
Remove the vacuum line from the ERG Valve and cap the hose. Start the engine and let it idle. Then apply vacuum (outside source) to the ERG Valve. The engine will stumble or stall if the ports are clean. If the engine continues to idle without change the ports are blocked and need to be cleaned. I cleaned mine in about an hour it's not that big of a deal on the 4.6L
Good Luck
Remove the vacuum line from the ERG Valve and cap the hose. Start the engine and let it idle. Then apply vacuum (outside source) to the ERG Valve. The engine will stumble or stall if the ports are clean. If the engine continues to idle without change the ports are blocked and need to be cleaned. I cleaned mine in about an hour it's not that big of a deal on the 4.6L
Good Luck
Post Fiend
Joined: Jun 2005
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From: North west La
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If you can turn a wrench this should be a pretty easy job. There are 8 bolts total that have to be removed. four hold the throttle body to the manifold and 4 coonect the throttle body to the air intake. the only thing you have to be careful with is the gasket between the manifold and the throttle body. If you do not damage it you should be able to reuse it. I put mine back on 40k ago and have had no problems.
