530i Resonance

Thread view:

Enable EMail Alerts

Start New Thread

Thread rating:

Steve Cooper - 20 Oct 2005 23:12 GMT

I have a BMW 530i model sedan with automatic transmission which has an
annoying resonance that appears primarily at around 45 mph in 5th gear. It
is worse after the engine warms up. I can avoid the issue by driving in
sport mode; however that hurts the gas mileage. Any ideas on how to fix this
problem? Thanks.

Reply to this Message

JB - 20 Oct 2005 23:37 GMT

>I have a BMW 530i model sedan with automatic transmission which has an
>annoying resonance that appears primarily at around 45 mph in 5th gear. It
>is worse after the engine warms up. I can avoid the issue by driving in
>sport mode; however that hurts the gas mileage. Any ideas on how to fix
>this problem? Thanks.

Cat heatshield loose?

JB

Reply to this Message

Malt_Hound - 21 Oct 2005 01:43 GMT

> I have a BMW 530i model sedan with automatic transmission which has an
> annoying resonance that appears primarily at around 45 mph in 5th gear. It
> is worse after the engine warms up. I can avoid the issue by driving in
> sport mode; however that hurts the gas mileage. Any ideas on how to fix this
> problem? Thanks.

Not a direct answer to your question, but I'll bet driving in "sport
mode" doesn't hurt your gas mileage as much as you might imagine. That
is unless you use your right foot with more gusto whenever in sport mode
too...

My point is, just driving in a lower gear and spinning the engine faster
may or may not hurt mileage.

Signature

-Fred W

Reply to this Message

JimmyG - 22 Oct 2005 22:58 GMT

Where does the sound seem to be coming from?

Perhaps a higher RPM in sport mode is making a muffler problem evident.

As for poor MPG, I'll second that opinion about poor mileage. The
difference is minimal. I ran three, full tank tests on each of sport mode
& Non-sport mode. Mileage didn't vary more than one mpg at best.

You're missing the fun if you don't use sport mode.

Reply to this Message