quote Originally posted by Csjag: It must be the salt used on roads there, I've yet to see a rusted out Fiero here, both of my 85's have very little frame rust and no trunk rust. Rust under the battery is a different story though.

Yes the salt gets up behind the wheel well and where the side of the trunk has a spot weld it rust. They start small and can expand to where only the fiberglass quarter is the only thing holding up the back. The uni body over the rear axle can rust through too.

The batter tray is also an issue here. I coated mine in grease when the car was new and now use a gel battery and it is like new yet today.

the cars look great outside but under the skin they can be a real mess.

quote Originally posted by hyperv6: Yes the salt gets up behind the wheel well and where the side of the trunk has a spot weld it rust. They start small and can expand to where only the fiberglass quarter is the only thing holding up the back. The uni body over the rear axle can rust through too. The batter tray is also an issue here. I coated mine in grease when the car was new and now use a gel battery and it is like new yet today. the cars look great outside but under the skin they can be a real mess.

Yes, I think GM could have put a drain hole under the battery or something similar to prevent rust, especially since it is open on the top because of the engine vent on all cars except the 84.

quote Originally posted by Csjag: Yes, I think GM could have put a drain hole under the battery or something similar to prevent rust, especially since it is open on the top because of the engine vent on all cars except the 84.

I believe most of the trouble is the fact the batteries give off acid and runs down on the mount that is welded in. Other GM cars like Chevelles etc. all lose their mounts the same way to but are under the hood. I have replaced many over the years and they bolt in in those cars. This is why I went to a Gel Battery as it does not vent acid.

First masshole to post on this thread.
I haven't seen any other fiero's other than 3 in junkyards