ill get you a pic. hard to explain. right side of the motor when you looking under the hood, above the manifold, its a round thing w/ something pluged in the middle.

 

sounds like everyone has covered everything cant help to much sry

 

By far, the most replaced part in the EGR system is the DPFE (use Search). I only posted to this thread because my 3.0 has suffered this exact bucking symptom. I can predict when my DPFE is going bad, long before the CEL lights, w/ P0401. I think I'm running #4 DPFE now on my 2000. (I drive 32 mph on Cruise for two miles every day in 4th gear - that bucking is so bad, I'll disconnect the EGR valve until I get a new DPFE to fix it) I'll be standing by for a certain "auto tech" to tell me "EARL your an IDIOT", and "all this sensor does is monitor exhaust flow, it is NOT A OUTPUT solenoid or motor thus is has no affect on how the engine runs!" (pasted from a rude PM, lol).

There is also an EGR solenoid which controls the vacuum TO the egr valve, causing it to open/close. The EGR valve itself is RARELY bad, but there is a check you can perform. Apply vaccum to the egr valve and see if it holds.
http://www.tomco-inc.com/techinfo.aspx Look around there, lots of good info.

You should also inspect the hoses to the DPFE for cracks, etc. Get replacement tubing from FORD, sold by the foot. Pricey, but worth it. They are different sizes, so make sure to connect them properly.

 

so all you did was unplug your EGR and that fixed it??

 

I had a similar problem with mine it was a random miss fire it turned out to be the coil pack and it had also fouled out #4 plug

 

so i need to replace vacume lines or what?

 

I just cleaned my MAF and put in a new filter and mine seems to be okay now.

 

bump
what do i need to do to fix my EGR problem?

 

I would create your own thread, you'll get alot more hits and views that way

 

this is my thread!

 

oooo **** sorry lol
it was a long day at work

 

Hi Matt.

When mine (3.0) acted like yours, I replaced the DPFE (even without a code) and got rid of the annoying "trailer-hitching".

However, the hoses to it could be bad, so inspect them before you drop the $54.

The Tomco site I linked to gives a lot of troubleshooting for EGR.

 

lol its all good

 

what exactly is the DPFE?
and i looked around at all the little colored hoses that went to it and they looked ok to me. i will look again though and after that i'll have friend check over too.

 

Check both ends of the hoses, and underneath where you cannot see. If you rub them, and bits and pieces of the hose come off, replace them, they are no longer any good.

 

k, ill do that now.

 

i think i found my problem. dry rotted vacume lines.

 

Unless it looks different I cannot find the damn thing. I am still experiencing bucking, All vacuum lines are new. There is a hose the attaches to the intake just behing the TPS. and goes to an evap system located on the left fender well. but thats all. any suggestions to stop the bucking? I read the other threads already but none of that stuff applies. thanks dr

 

David, 99 4.0 may not have EGR; I KNOW the 2000 4.0 doesn't.

Have you looked at the spark plugs yet? May be bad plug wires (mist them at night, look for arcing).

 

pretty sure all the ohv engines have it

 

mine does this crap too..I dont know what it is!..i changed spark plug wires and thats about it!...solve the bucking and wiered idle probelms already so i know what my problem is lol

 

plugs and wires are all new.

 

any luck on the bucking?...mine is still doing it..

 

See my thread, .054 whats your gap?

I put a 2nd new set of plugz (motorcraft Plats.) and regapped to .054

I have no more bucking whatso ever. btw, I also changed the IAC solonoid, wires, cleaned the MAF with contact cleaner and replaced the lower evap hoses located right behind the TPS.

 

mine stoped. it was the egr but u havent fixed it. its just unpluged till i but vacume lines or get a new one