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I had this problem and I went top to bottom trying to figure it out. It turns out that the sensor had come loose at the bottom of the air filter canister. I just needed to push it back in and then it ran fine. You can't see it from the top, you have to feel around the bottom. Of course, this was after replacing plugs, oxy sensor, and checking all COPs.
My truck has had those systems twice, once when I first bought it and it needed 2 COP and last week when it needed 1 COP. At this frequency I would like to know where can I get a discount priced COP since Ford charges almost $180 parts/labor each one. My check engine light never lit up and the dealership has to put it on the computer to pinpoint which one.
Although we are not allowed to post prices, we recently lowered our prices on our SOS COP's. Sometimes, the check engine light will not come on when your coils are breaking down under a load.
Our new Ford COP’s, the Sultans of Spark(S.O.S.), have
been designed with both durability and performance in mind.
Please see them at: http://www.performancedistributors.com/soscoils.htm Quality was the main feature we stressed when we went to the
drawing board on these coils.
I can almost get every part anyone needs wholesale from any vendor, incl ford. My heaterfan resistor I thought was malfunctioning according to the wife, there was no low fan, (but there was) and I got one for 59.00 fords price was 72, but I didnt need it and sent it back. if your local to the MA New england area dont be afraid to give me a shout, I do not mind helping anyone out, it brings good Karma and any buck you can save is a buck you can spend on one of your kids....or toys.