Comments on: How to diagnose 1994 Ford Taurus code 332 Insufficient EGR flow detected?

By: Ironhand

Ironhand — Sat, 15 Aug 2009 19:16:31 +0000

Start here: EGR function test—Start the engine and allow it to idle, Apply vacuum to the vacuum port of the EGR valve; the engine should stumble or die. If it doesn’t, the valve is damaged, or the ports are obstructed.
If the engine stumbles, the two other components to check are the modulator solenoid valve and the DPFE sensor.
With the engine idling, remove the vacuum line to the valve and put it to your tongue. Do you feel a pulsing vacuum? If you do, the modulator and vacuum plumbing are good. If not, repair as necessary.
Now the only thing left is the DPFE sensor. It is an aluminum box-shaped sensor, about 3 times the size of a pack of gum, near the EGR valve and has two hoses connected to the bottom of it and a wiring harness connector with three wires.
There is a means to test this, but it takes a rather expensive piece of equipment. You probably don’t have a DSO (lab scope). Remove the sensor, and check both the tubes it is connected to, making sure of integrity and that they are not obstructed. If they are in good order, and the electrical connector is not damaged, replace the DPFE sensor.
The parts house won’t have it, most likely won’t even know what you are talking about. This is NOT an EGR position sensor. You will have to get it from Ford, and it isn’t cheap.
Good Luck

By: bestwrencher

bestwrencher — Sat, 15 Aug 2009 19:16:31 +0000

that year had alot of probs with the egr flow detector, its is also called a egr position sensor, but I’d make sure all vacumn lines are ok before i’d change anything

By: gary o

gary o — Sat, 15 Aug 2009 19:16:31 +0000

Could be more than one issue. Start by checking the vacuum to the EGR is it getting what it needs to open and is opening at the right time, i.e. after the engine warms up. Also the valve inlet may need to be cleaned. to do this you need to remove the EGR valve. Also check to see if the valve is opening at all, to do this apply vacuum manually using a hand vacuum pump. If it does not hold vacuum the diaphragm is leaking and you need a new valve.