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Re: My ford focus is reving while it is idle and the...
Try the engine breather pipe behind the inlet manifold at the front of the engine ,as for the dim lights then it could be the alternator on the way out like the brushes worn down or the commutator worn out
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To remove the lead from the battery to the alternator while it is running is to invite a destroyed alternator . Varying voltages with engine RPM is indicative of a bad battery or problem alternator regulator . Have a load test done on the battery to check for cell problems and have the alternator bench tested to check the performance .
Check your fuses, and check your air hoses, also the ford focus and ford escort have weak alternators and your alternator may not be putting out the power to operated your air over level 2, i would check this out by letting your car idle and have your lights on and your air, do this at night see if your lights go dim then bright and continue to do so.
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