Interestingly, I'm having the exact problem that Tony described. I revved up the engine and I can feel the **** sometimes. I did get a new transmission about a month ago. No check engine light is on. But it jerks at over 50 mph though. Feels like you're going on bumps.
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Answer to question 1) Absolutely, what you are describing is exactly what you would notice and feel with a faulty c/o! Significant power loss and a shaking/vibration that feels as though it's coming from the transmission. I would venture a guess that the computer detected an engine misfire before you noticed the problem and it gave you a "heads-up" with the check engine light. I would go ahead and change all of the plugs if it's been a while and at least the c/o on these 2 specific cylinders.
Answer to question 2) Several things could cause this sound. First, and most likely with the 5.4, from what you describe you have lifter "ticking". Typical for Ford, not hating, just saying. In fact I own a 98' like yours. The other possibility is that it's an exhaust leak. You can determine which it is with a mechanics stethascope or even a short length of garden hose. With the vehicle running, take your instrument and place it very closely at one end of your valve cover and the other end to your ear and slowly move to the other end of the cover listening for the "tick". Now move to the other cover and repeat the process. If in fact this is where your sound is coming from it will be very obvious when you find it. If there is no noticeable change in the sounds at the covers then begin to inspect the exhaust system starting at the manifold coming off of the engine. Hope this info helps to solve your problem!
take those codes to a Auto zone or somewhere like that and they can tell you exactly what they mean. You can also go to one of those places and use their machines and then go to ford with the codes and they will be able to help you a lot better. good luck.
Mine is doing the same exact thing. I recently took it to an oil change place here in town and they put the wrong oil 10W-30 in it and the wrong filter. It needs motorcraft 5W-30 from what I hear. Im taking it to the Ford dealership today. I feel your pain my friend, it's extremley annoying. I will keep you updated if the new oil fixes the problem. Also have you checked the oil sending unit?
On top on the engine, all the way to the back, and down a little, there some vacuum connection, one has an elbow that always leak's, start engine and feel back there, 9 out of ten time's that's the problem, that will also set an engine light on for lean.
Check around the fuel rail and injectors for leakage--this is not a problem to ignore due to the fire hazard that exists. Watch for any sudden wetness appearing when the key is turned on--no need to start the engine. When you find and repair the leak, then take the car to Autozone or similar business to have a free scan run on the computer looking for the horsepower problem. Hope this helps!
could be a number of things. check the motor mounts first. also the exhaust pipe may be hitting under your seat. a bad coil can make your engine shake. my bet is that it has something to do with the exhaust though. it could be a minor fix or an major one, depending on the exact cause.
That's an intersting problem.... I would assume that if it was misfiring in a cylinder it would trip your check engine light as it did before. Because it only happens when you are going 50 it might be something else. What happens when you put the truck in park or nuetral and rev up the engine? Rev it up slowly and see if jerks or hesitates at any particular rpm range, I'm just trying to rule out if it's a possible transmission problem or engine problem. Let me know and I can assist further.