Low acceleration rough noise

[saurey]

My bitchin' IX makes a grindingish, roughish, but not too hard sound when the gas is just barely pushed. We are talking less than 2K RPM's just barely above idle. After I push a little harder, it goes to it's smooth, small truck sounding regular noise.

Also it seems to idle a little rough with deep bass-y grumbling with no RPM jump visible on the tach.

It's an automatic. Any thoughts? Muffler?

Thanks in advance for any tips.

[jlevie]

Intake leaks would be the first thing to check for. And that is done by having a shop run a smoke test.

[saurey]

Looks like initial diagnosis is a broken clip between the muffler and cat that is rattling with low frequency. Also there is a wired on head shield on the cat that could be rattling that we are taking off as well. Hopefully that's the root cause and an easy fix.

[e30jake]

My bitchin' IX..............

It's an automatic.

:giggle:

[saurey]

HA I know. I want to do a 5spd swap at some point.