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Old 07-26-2016, 10:40 AM   #1
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Engine Cuts Out

2005 Focus ST 2.3L, 5 Speed Manual, 110,000 km.

Engine most commonly blips while driving in 5th gear around 70 km/h over 2000 RPM. Seems really strange, almost like it is cutting it out. I have connected a borrowed OBD II scanner and it does not show any misfires.

Any known similar issues? Not sure where to start with this.


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Old 07-27-2016, 08:29 AM   #2
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Check coil and wires.
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Old 07-27-2016, 08:33 AM   #3
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No wires there. Wiring to them maybe.
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Old 07-27-2016, 10:13 AM   #4
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might check for tracking on the coil boots too. are you looking for misfires in mode 6 data or just for misfire codes?
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Old 07-27-2016, 01:04 PM   #5
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Check your whole EGR system, some of that doesn't usually throw a code until later on, and if you have a DPFE sensor, that never throws a code. A poorly functioning EGR will feel like slight power loss and loss of responsiveness.
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Old 07-27-2016, 01:39 PM   #6
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no DPFE on the duratec. I'd do plugs, and clean the maf (cheap to do) if that doesn't work I'd be looking at the coil packs/plugs. Those are known to go bad after awhile
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Old 07-27-2016, 07:06 PM   #7
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A coil shorting/opening out/up at hot could do it. If not above a certain level won't show a code.
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Old 07-27-2016, 07:15 PM   #8
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The OP mentioned using a scanner and it not showing any misfires, I'm still wondering if he only checked for codes/pending codes.

With my inexpensive scan tool you have to dive deeper into the menu, the "Check Monitors" function on that one will give actual misfire counts by cylinder so you can find out a LOT more that way.

It takes quite a few counts to set the pending code, and many more for a CEL.
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Old 07-28-2016, 09:12 AM   #9
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Thanks for the tips. Gives me an idea where to start. Plugs have been changed. The scanner that was used just had a menu that said "misfires". Did not check any further, new to using diagnostics and not much of an electrical guy but learning. This was a borrowed scanner.

We had a very, very heavy rain yesterday. Roads had so much water that I had minor hydroplaning. I could feel the car was under more load while driving in the rain and I had several instances of it cutting out. They were more frequent and more noticeable. Worst I ever experienced. Dry roads today, and everything is normal. Under normal driving, it may occur once or twice every 2/3 weeks under the right speed, gear and RPM as mentioned earlier.
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Old 07-28-2016, 02:12 PM   #10
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Quote:
Originally Posted by Tundrafoci View Post
no DPFE on the duratec. I'd do plugs, and clean the maf (cheap to do) if that doesn't work I'd be looking at the coil packs/plugs. Those are known to go bad after awhile
You mean there is no DPFE sensor that is separate from the EGR. The control valve on the Duratec still contains a sensor to tell the ECU what to do about EGR gas and fuel amounts. It's unfortunate that you have to buy the whole unit to change the weak part.


jayler: A stumble is either spark or fuel (unless there has been compression loss). If you find that the plugs are good, and the coils are good, and your grounds are good... then check the EGR system (that is, if the fuel filter and pump are also good).
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