91 Civic DX, motor revs up and down at idle
02-20-2006, 08:40 AM
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91 Civic DX, motor revs up and down at idle
Hi All,
I have a 91 DX Sedan (1.5L, completely stock) with 235,XXX miles. Recently the motor started to rev up and down for no reason at idle (don't have a tach, but I am guessing it's revving up because of the noise), and it seems like it's running rich too. I've changed the spark plugs and wires and that didn't help. Oil changes on a regular basis, and the car still gets 35+ miles to the gallon.
What could be the cause of the revving up at idle? I am kind of guess fuel filter might need replacing?
Please help. Thanks.
I have a 91 DX Sedan (1.5L, completely stock) with 235,XXX miles. Recently the motor started to rev up and down for no reason at idle (don't have a tach, but I am guessing it's revving up because of the noise), and it seems like it's running rich too. I've changed the spark plugs and wires and that didn't help. Oil changes on a regular basis, and the car still gets 35+ miles to the gallon.
What could be the cause of the revving up at idle? I am kind of guess fuel filter might need replacing?
Please help. Thanks.
