Wierd sound after fixing "check engine" light

[Adam Smith]

I don't know how to describe this noise, but I just noticed it. I recently installed Rancho RSX shocks on my '04 Trac. While installing the rear shocks, I dropped down a plastic box which seems to be attached to the gas tank emissions system (i.e. vapor recovery?). My check engine light came on a couple days ago. Tonight I crawled under the truck and found a hose had fallen off the plastic box by the gas tank. Before reattaching it (needed to drop the spare), I noticed that when I turned on the key to start the engine, just before it started there was a loud sound like a double drum tap, as if something was happening in a hollow area. I start the engine, shut it off, and the same sound happens again as it is shutting off. If I turn the key again to start it, the same sound comes back. It is really loud and very strange. Definitely in something hollow.

Thanks.

 

[Todd Z]

Could be the cats, You may have only noticed it because you were looking for other noises...



I had something similar, it sounded like some one kicked the floor board on the passenger side, It was the cats..



Todd Z

 

[EddieS'04]

I get that same noise at shut down, since day one. I think it is some vaccum cotrol shuting down.