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Old 05-16-2017, 02:38 PM   #1
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need push in right direction! Duratec 2.0

i love my 07 Wagon.. shove my mtn bike right in the back!

love when it runs smooth too.. but for the last YEAR, its had an intermittent rough stumble kind of power... mostly under load 2K RPM up freeway grades at 65mph.. but also on surface streets... it shudders BADLY.. and then i back off the pedal and it smooths out...

it affects shifting... it kinda slams in gear (auto trans)...

and then sometimes it runs and shifts perfectly!

could i have an intermittent vacuum leak? does a Focus auto trans use vacuum as a variable in its shift points?

could i have a "weak" fuel pump? (no schrader valve on this engine fuel rail)

been fighting this for a YEAR!

no CEL

did all im capable of... replaced plugs (not ea indiv coil tho) , new fuel and air filter, new EGR, MAF and TPS.. visually inspect PCV hose looks ok.. idles fine..

any thoughts help please! thanks in advance

Frank


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Old 05-17-2017, 12:35 AM   #2
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No vacuum used at all at the ATX for shifting, totally electronic.
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Old 05-18-2017, 02:09 PM   #3
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Try the DPFE sensor that controls the EGR, it doesn't have a CEL associated with it when it fails, just causes bogging briefly at certain speeds under load.
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Old 05-18-2017, 03:12 PM   #4
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Quote:
Originally Posted by FavoriteFocusWagon View Post
could i have a "weak" fuel pump? (no schrader valve on this engine fuel rail)

no CEL
Use scan tool to monitor fuel pressure. You should see 40-50 psi. Also use scan tool to check for DTC's. Not all DTC's will turn-on the CEL.

Does the intermittent problem ever show when cool/cold outside? (cool morning) -also does it show up more often when warm/hot outside? (late afternoon).

Quote:
Originally Posted by Pb-foot View Post
Try the DPFE sensor that controls the EGR, it doesn't have a CEL associated with it when it fails, just causes bogging briefly at certain speeds under load.
There is no DPFE in a Focus with the Duratec engine. OP has Duratec.
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Old 05-18-2017, 03:29 PM   #5
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Quote:
Originally Posted by Marde View Post
...
There is no DPFE in a Focus with the Duratec engine. OP has Duratec.
Thanks for the correction. That's what happens when you assume too much by don't read enough... 2007 wagon. Doh! Nevermind.



However, for accuracy's sake... all EGRs need monitor/control, thus, the Duratec does have a DPFE sensor, it's just not a separate DPFE... instead it's part of the whole EGR assembly. More money for Ford parts when it fails???
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Old 05-18-2017, 04:07 PM   #6
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Quote:
Originally Posted by Pb-foot View Post
... instead it's part of the whole EGR assembly...
Nope. Just the EGR. There is no DPFE-like/Vacuum-like functionality built into the EGR. All monitor & control of EGR is provided by the PCM.
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Old 05-18-2017, 04:32 PM   #7
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True, there are several other ways to determine the valve location than just using DPFE.

A MAP does it, a electric stepper locator does it, an absolute position indicator can do it. A back pressure sensor (PFE) can do it, another way of reading pressure not as involved as DPFE.

More than one way to skin that cat there.
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Old 05-18-2017, 04:34 PM   #8
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I'm guessing that you are not getting a check engine light. You didn't mention it.

I had a coil go bad and it was maddening! It would stumble at lower RPMs and then at about 3000 rpm, and above, it seemed to run fine. I don't recall whether, or not, I got a CEL from that.

I'm willing to bet that some code reader could give you diagnostic information which wouldn't trip the CEL. I have a bluetooth ODB2 connector which does connect with my Android phone and which is supposed to allow Torque or Car Gauge to be able to retrieve that info from my Fords, but I haven't yet tinkered with the setup enough to know how well it works.

Best of luck with your repairs!
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Old 05-18-2017, 08:55 PM   #9
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Quote:
Originally Posted by amc49 View Post
...More than one way to skin that cat there.
About 2 years ago, we had a Duratec EGR thread. In that thread, several people discussed and agreed/assumed that:
(1) the EGR valve has no positional feedback (position of the plunger) going back to the PCM.
(2) the PCM detects the results of opening/closing the EGR valve plunger via changes in MAP sensor readings (aka intake manifold pressure).
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Old 05-19-2017, 10:06 AM   #10
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Ahha, good to know. I knew there had to be some way of monitoring the function of the EGR, via feedback. The EGR can't stand alone with just PCM control, if the PCM doesn't have information on it's function. MAP is fine with me.
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