That will do it .

Suck test the EGR while she's running

 

I will suck test the EGR. And while I'm at it I will try to plug off the egr vacuum line to see if the problem continues. What works well for a plug on a vacuum elbow?

So Far:
New fuel filter - no help.
Swapped stock plugs for autolite double platinum - no help.
Bought a single COP and tried it in cylinders 1, 2, 3, 4, and 5 - no help. Not trying other cylinders as it will take more work to get to the others and I will be putting all 8 in soon.
Bought a set of 8 COP's and Motocraft SP479's. Not installed yet... waiting for COP's and time to install.

 

Your on the right track - I to tried to swap all COPS a new one(one at a time)- that doesn't work - Tried many ways to deternine a faulty coil w/low grade misfire.

When it comes right down to it when you figure "Time & Materials", replacing all with new ones is the ticket..

 

I pulled the vacuum line from the egr valve, put my vacume pump on there. With the engine idling, I can get the motor to run poorly if I put a vacuum on the egr valve. I can't get it to die, but it does idle very bad. When I remove the vacuum, the engine goes back to a normal idle.

I left the vacuum line plugged with a golf tee and took it for a test drive. I can still get it to miss at 45 mph. It still stumbles off of a dead stop. It MIGHT be less of a miss and less of a stumble, but that is a tough call.

Now for the confusing part.... the SES light never came on!! I drove it 50mph or so for 3-4 miles, turned around and came back. I even floored it up to 65mph or so and coasted for a long time. No SES light. I will drive it to work this way tomorrow and see if I get a light then.

 

FYI: My bad #4 COP didn't set the CEL until I'd driven for about an hour (off and on).

Andy

 

Reconnect the EGR and do the plug and cop job.

 

Also with engine off (didn't know you had a vac tester) Pump it up between 4 - 5 - it should hold.

If your SES light blinked - code is set , get it read so you know exactly what cylinder is misfiring. Other than that - yea, replace them all regardless..

 

thats where it started probly the best thing to do

 

I got on the highway this morning, set the cruise at 70, and within a half mile, the SES light came on. So the DPFE is probably ok. But I did some googling and found these great links on PFE and DPFE operation and diagnosis:

http://www.tomco-inc.com/Tech_Tips/ttt34.pdf

http://www.tomco-inc.com/Tech_Tips/ttt35.pdf

http://www.tomco-inc.com/Tech_Tips/ttt36.pdf

I was going to do some more checking of the DPFE but not sure I need to with the SES light on now.

When putting vacuum on the EGR valve, I was under the hood so I don't know if it stored a code or not. JBREW, you say to put 4-5 inches of vacuum on the egr and wait for a misfire. Good idea. Do I need to drive it with the vacuum on the EGR? If so, I will need to get some vacuum line that fits on the EGR. I was using a cone shaped adapter on my vacuum pump and putting it inside the EGR nipple and holding it tight. It won't stay there without me holding it.

 

I'll try to save you some time - If the MIL is on and you have stored code PO401 - There a 8 times out of 10 chance it your DPFE.. DO NOT buy DPFE Sensor from third party suppliers . Ford updated these sensors and you have to get one from them , unless you have the aluminum one - TOMCO and Ford will have those .
Auto Zone' s and other's won't , not even NAPA , they'll have the pre-dated Sensor's which can foul soon after purchase. - (Reason for the update)

BTW - theres 3 types of DPFE sensors - If you have aluminum - that's what you replace it with (others won't be compatible.)

The other two are plastic - Part #'s Important - You can go to Motorcraf. com and search by your VIN # for the correct sensor.

You pump up 4-5 (Hg's) - ? - Just mean inches of Mercury - Think of it as negative vac pressure - If your using "Might Vac" or like unit.
Any way , you watch the gauge after you pump it up and it should still be @ 4-5 (hg) after 10-15 seconds time - at least.. - shouldn't move at all or your diaphragm in the the EGR valve is bad.


Heck No - Get the code read @ auto zone for free , make sure you get the exact number/numbers stored. - look at there scanner as it comes up..

I' m getting mixed up here - didn't we go thru all this awhile ago ? maybe not - thought you had a blinking light at one time or something - didn't we tell you how to fix it? So you never fixed your misfire ? I that what we are working on

TOMCO's a good site , but look at the date on some of there literature and PDF'S - Ford Scorpio is a little more informative - both are good though..

Buy some 1/4 - 3/16 hose and fittings for that vac pump - You can rob your washer fluid hose for now until you get some..

 

Still Workin ? You just replaced one COP right ?

 

I never had a SES light come on except for yesterday when I disconnected the EGR to see if the miss goes away. So with the EGR disconnected and it's vacuum line plugged, I got the light to come on and the error was P0401. I cleared that code and put the hose back on. NO more SES. BTW, I have a cheap code reader that only pulls trouble codes for OBDII and CAN.

EGR holds vacuum just fine. I don't know if the EGR moved with 4-5 in of vacuum but I do know it holds over 15 in of Hg so it doesn't leak. I could hear the EGR move when I pulled the vacuum pump off so I think it's ok. Note that the engine idles very rough when I put 15 in of vacuum on it, but it didn't die.

The DPFE is a plastic one but now that I got a P0401 with the vacuum line removed from the EGR, I think it is ok.

I still hope the COPs fix my problem. They haven't arrived yet but I expect to put them all in this weekend. So far, I have put the one new cop I bought at checker auto in cylinders 1, 2, 3, 4, and 5 and the miss is still there. I think the miss was better (missed less) when the egr was disconnected but it's hard to tell. I have motocraft sp479's to put in with the new COPs as well.

 

Mine has wasted #8 twice. Found it to be a small leak in heater hoses, that
leaks down onto the #8 coil.

 

Yep. Just replaced #4 COP, then reset the CEL. Towed the trailer 120+ miles last weekend without a hiccup. Now I just have to make/find time to do the full swap.

Andy

 

I had two cylinders misfiring on Autolites before - New Double Platinum's!! I threw an old set of motorcraft plugs in that had over 50k on them and she ran great!! Those Autolites blow for these motors.. Even if you can get them to work - I wonder how much your loosing as far as performance and economy..?

Careful pumping up the EGR - 15 is to much , way to much ..You can blow the diaphram - 4-6 hg max..