Having problems with your Ford F-150 ?

Can't fix the EGR excessive flow code

\015 My engine light keeps coming on and the engine has almost a missing type of a "****"/hesitation to it. I can still accelerate without the problems. Code keeps saying EGR excessive flow. I have replaced the egr valve twice and the dpf sensor with only short lived results. Gas mileage is very bad. I don't know what to look at next for this code and problem. It is a F150 2001 approx 107,000 miles.\015 Posted / edited by AnonymousUser on : 10-12-2018

Answers :

Check for

vacuum leaks on intake manifold,

the air tube between the air filter.

intake manifold vacuum hose.

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clean throttle plate with Berryman carburator cleaner

SEE sample picture HERE
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Also remove carbon built up behind the EGR valve and the EGR passage tube.

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Vacuum leak WILL offset the intended 14.7 to 1 air fuel ratio.

More un-metered air (leaks) will lean out the fuel mixture.

Use small amount of Berryman carb clearer at potential air leak area will help you identify trouble spot.

At idle,just spray and listen for the RPM surge.

The in-rush of carb clearer will increase the RPM on the motor.

Record the problem spot(s) and address it later.

===

EGR carbon built up require 2+ hours to clean from start to finish.

You will need a new EGR base gasket before your start.

Locate and remove the EGR valve after the vehicle is cool down.

Carefully record the connector and vacuum line (for older vehicle) location by drawing an easily to follow diagram.

Remove the EGR valve.

Inspect the location of the carbon built-up inside the valve and the EGR passage tube.

SOAK these areas with WD-40 spary.

You will need a small screwdriver,cloth hanger and lot of newspaper and time to get this cleaning done right.

RE-SOAK the carbon and let it sit for over-night will also help.

One the last round,pass a shop vacuum of the EGR valve and the passage pipe.

Install the new EGR gasket and connectors.

Allow the vehicle to warm up outdoor to burn up any remaining WD-40.


Take it for a test drive.


Please rate my answer if it's useful to you.


Cheers,

Mustgo
In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.


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  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticeable difference in RPM's with the EGR open
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  • Clean out the EGR valve and/or tubing to remove deposits
  • \015\012
  • Check the voltage at the DPFE, compare to specified values (refer to a repair manual for your specific model)
  • \015\012
  • Replace the DPFE sensor (with a good quality / OEM one)
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Repair Help & Product Troubleshooting for Ford F-150

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