I have a 2005 Ford Focus, and just in the last month, the engine has started running louder between 45 and 55 mph. It's the regular engine noise, just half again as loud as it is at other speeds. Is this a problem? We've had the belts checked, so it's not a loose belt.
It sounds like someone has been rough on the car. Your transmission may almost be shot, or you need a flywheel repair kit. If you get a flywheel repair kit, you can save your transmission. A flywheel repair kit is cheap. But a transmission aint cheap at all.
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Depends, these trucks had problems with this, the noise you here is the electric air pump, it can be a little noisey, it should sound like a smooth jet engine bad as it starts going bad it gets a little louder but can still last a while (ayear or two), when it goes bad the engine light will come on, if its not too loud a wouldnt worry about it, even a new one will be heard, maybe not as loud but there noisey, it runs on start ups for a few sec -20 -30) hope this helps. good luck.
could very well be a timing issue if it sounds like a rattling or a very poor grade ofuel. If you are using regular fuel, try putting some premium in next fuel up. It should be repaired mconyuinued driving can cause damge.
Check and see if the EGR valve is leaking, to check this spray water on it at idle, if the water steams off the valve is leaking and is the source of your problem, also are you sure you hooked the new DPFE sensor up right? re-check it..