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I have a 2005 focus zx4, has approximately 48,000 miles. I have been having an issue that started out intermittent and is now becoming more frequent. For instance if I am in second gear holding about 3,500 rpms for about 5 seconds and then punching the gas the check engine light will start flashing and have a total loss of power. The engine sounds like it is running on three cylinders or timing is extremely retarded. The system will not set any dtc's and will eventually even itself out. If I let the engine idle at a stop it runs really rough and does exactly what is described in other issues found on this forum but no one as far as I could see has this problem. So if anyone has any clue where to start looking or some kind of advice to diag this issue I would greatly appreciate it![:)]
 

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You my friend have some sorta fault in the ignition system from the sound of it. Remove each one of the coils and inspect them for damage or wear and the plugs as well.

Sorta the same thing happened to me when I washed my motor off and water seeped in with one of the spark plugs. Ruined a coil and gave a random misfire every so often under hard throttle and then would continue to miss until I shut it off.
 

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When it's running rough unplug on coil at a time and see if it changes if unplugging on coil chnages nothing you either got a bad coil,plug or connection to the coil. Also even if the light flashes for a second the pcm will store the codes under history codes but you need a good scanner to read those in the computer. The SCT xcal 2 won't read history codes.
 

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I wouldn't unplug a coil while its running... The injectors will still fire filling the combustion chamber with unburnt gas which will get into the cat and explode damaging your emissions system.
 

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My roomies benz did that and the dealer replaced just about everything in the ignition system but the flippin spark plugs. it ended up being the spark plugs, go figure. they went as far as to replace a fuel injector...oy
 

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flashing CEL normally indicates a misfire.
how are you checking for a code? are you using the odometer trick? the odometer doesnt see all the codes that the car throws. you need to get the car scanned by either a buddy with a flash tuner or go to advanced auto or autozone. they normally will scan the car for free. get the code number and figure out what cylinder is crapped out.

on the duratec this is normally a bad coil.

btw, if you start removing coils while the engine is running the damage will not compare to the damage done by the misfire. so, while the engine is running you can slowly remove each coil one by one. once you come the coil that doesnt make the engine almost stall, you found your bad one.

good luck[thumb]
 

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^^^I'm pretty sure the Dtec like most modern engines has a function in the ECU that turns off the fuel injector if too many misfires are detected. This prevents damage to the cars emissions control systems. Usually turning the car off will reset this condition, or it will simply correct itself when the misfire condition goes away
 
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