The car has an automatic transmission. There is no check engine light on, it doesn't run hot. It seems to have normal engine power, just really loud when driving. There is no vibration on the steering column. What could cause this issue?
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2001 Honda Civic Question: What would make loud acceleration motor sound while driving, but quiet at idle?
Answer #1arturo08 March 25, 2013, 00:41Master
get a diagnostic run. lookin for prob. with tranny. get this done at a shop.
check tranny dipstick, lookin for muddy colour in fluid. if muddy, than fluid contaminated(needs a flush). if fluid not muddy but dark in colour, may need a flush. this you can do at home(checking dipstick i mean).
Replymacbeth55, March 25, 2013, 01:45Rookie
Thanks I will look at the transmission dipstick tomorrow. It kind of sounds like it is reving like it is in-between gears and reving like on a manual transmission but it is an automatic transmission but if you drop it down to D3 you can hear a shift in power downward like it should but still sounds loud. It is like the transmission isn't in sync. If it had been the muffler or catalytic converter it would be loud in idle, too. It has a V-Tec motor. But inside the car driving it sounds like a car with no muffler it is that loud while driving. The previous owner changed the timing belt about 4000 miles ago. Any other insight? Why do you think it is the transmission oil?
Replyarturo08, March 25, 2013, 19:32Master
sound only when in gear. following clues. suspect something in drive train. quick check to eliminate possibility. did you get the diagnostic run?
Answer #2pushrod March 25, 2013, 04:01Master
Have the flex coupling in the exhaust header pipe checked. Give it gas motor moves,be loud. Let off and idle, motor move back, be quiet! See muffler shop.
ziptie12 March 25, 2013, 18:54Master
What speed does the noise start? Tire cupping is very common on those cars , that and possible wheel bearing noise. Does the noise change with vehicle speed or engine speed ?
Replymacbeth55, March 25, 2013, 23:55Rookie
The noise started with acceleration and sounded like an engine revving up and sounded like it was decelerating as it slowed down. It was a consistent noise. Loud enough to sound like having glass packed mufflers on the inside of the car. You could not hear it from outside the car as it drove past. My daughter was thinking of purchasing this car. We are looking at another car now bit if that does not work out we will have this one scanned at a repair shop. I want to thank you for all the great suggestions. The Honda dealer said a new transmission would cost around $3500 and an exhaust manifold around $1800. If that is the issue. The scan is $109. The owner doesn't believe it is the exhaust system because it past a smog test recently. It is weird, the motor sounded really solid it had lots of power seemed to change gears smoothly it just makes alot of noise. Loud enough to be like standing next to a leaf blower. Thanks again! If we decide to have it scanned I will post the results.
Replyziptie12, March 26, 2013, 11:58Master
Most likely wheel bearing or tires. Check the tires (rear will probably be the ones) by reaching in and rubbing your hand on the inside tread in the direction of rotation , if it's not smooth , than that's the first thing to suspect.Have tires rotated and see if the noise changes.