I’ve got a 2003 Auto trans Honda Civic with 195,000 miles. Took car to shop about a month ago for broken sway bar links and asked them about an intermittent rumble strip sound (lasts a second or two) when cruising along on flat surfaces over 30 mph. Mechanic test drove the car and couldn’t replicate the noise so couldn’t diagnose (this makes sense as it was only occurring sporadically). Now a month has passed and noise is occurring more often - once every ten miles or so and is becoming louder so I’m worried about safety issues/small problem turning into a bigger one. The sound still only lasts a second or two. Did a Google search that has me thinking it’s the torque converter. Turns out despite having maintenance records going back to day one when I bought the car 15 years ago, I may have missed getting a trans flush along the line. Don’t judge - I was stupid enough to take the car to the dealer for full maintenance check-ups for the first 8 years and paid top dollar until my financial situation changed beyond my control. So anyways I thought, great - I’ll get the trans flush done tomorrow and maybe that will solve the problem - but have since been told that since I may never have done a transmission flush before that could cause more serious transmission problems in a high mileage car. They’ll have to check the fluid first to see how dark it is.
So long story short - taking the car back to my mechanic Monday due to my growing anxiety about letting this problem go. In the event they can’t replicate the sound again (I really can’t predict when it will happen), should I consider the trans flush or not? I read that this high-mileage issue could be a myth related to the fact that people get them done more often than not when their transmissions are failing regardless. Or pan drop and filter? How would they otherwise diagnose a torque converter problem? Any other possibilities? I considered wheel bearings but this sound is sporadic. I’d test braking while the noise occurs but as it only lasts a second or two I doubt I could react quickly enough. Any other possibilities? I can also just ignore it, but only if it’s something that won’t lead to bigger problems over the next 6 months (or year in my dreams if I can make it to the end of the model year sales next October) - trying to get one last year out of the car and save for a decent new car as I just started a new job. Plan to have mechanic check front end suspension (not sure why they did not do this last time - but taking it back to the same shop as I believe a sway bar link may have already broke again - very subtle knocking when turning hard left again, has new axel).
** No check engine light, no other issues