Bottomed out - cannot locate damage - Forums at Modded Mustangs
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post #1 of 34 Old December 6th, 2013, 07:14 PM Thread Starter
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Bottomed out - cannot locate damage

I was parked and pulled forward and ran over one of those concrete blocks they put in parking lots. The car bottomed out hard and immediately the engine got loud and sounded shitty and lost power.

When I got home, I got under the car best I could and checked the exhaust. The mid pipe to header flange nuts were loose on the passenger side, and the cat got crunched a bit, but I see no visible cracks, holes, or separation around the seams. The other cat is crunched too, pretty sure the previous owner bottomed out and flattened the cats before.

I tightened the flange bolts, and checked the top 4 header bolts (they were tight), but that did not solve the problem. The engine is still very loud and has no power. Smoke and oil or gas is coming from the passenger tail pipe. There is a hard knocking sometimes coming off the gas; getting on the gas is a harsh rattling and the engine even briefly bogged out for a second. It sounds like backfiring or explosions under the floor board, but I haven't ruled out suspension damage. I have seen no other damage but I'm pretty much a novice when it comes to car repair.

My best guess is the cat is destroyed, but the amount of smoke and gas/oil coming out with the hard clattering sounds makes me worry it's bad. It looks like my oil level may have dropped a bit, but I can't say for sure. Surely bottoming out wouldn't fuck up a piston ring or anything like that?
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post #2 of 34 Old December 6th, 2013, 07:26 PM
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I would say you broke a (or both) cats apart.

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post #3 of 34 Old December 6th, 2013, 07:38 PM
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I would take off the exhaust and inspect the cats. Then look for anywhere else you can see damage and inspect those parts also.

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post #4 of 34 Old December 6th, 2013, 08:07 PM
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I concur , look for any leaks as well

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post #5 of 34 Old December 6th, 2013, 08:51 PM
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...Nytrix negged me?

Another thing. You may have cracked a pipe by bottoming out, that would make it louder and if it's in the right spot it could mess with the o2 sensors making your engine run rich/lean, which could make your engine sluggish.

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post #6 of 34 Old December 7th, 2013, 12:25 AM
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My car had pypes hi flow cats when i bought the car. I removed them and when i did, i found that one was broken. If you have a dent in the cat, you probably need new cats or need to delete them. that fiberglass is fairly fragile.

People used to hit cats with hammers to break them up and increase flow without needing new piping or to keep a stock appearance for inspections.

Increased flow and messed up cats will throw off your tune as your O2 sensors will be getting weird readings and your car will be trying to correct for it. Anything is possible but, i would bet that you just need some new cats.


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post #7 of 34 Old December 7th, 2013, 12:28 AM
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After I got my splitter I barely pull up to concrete stops. Backing in FTW.

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post #8 of 34 Old December 7th, 2013, 12:46 AM
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Quote:
Originally Posted by jdmpwr07 View Post
After I got my splitter I barely pull up to concrete stops. Backing in FTW.
This. My wife hates it but I usually park in the very back of the parking lot where there's no damn cars, and 90% of the time I back into my parking spot. If I don't back in, I leave a very healthy gap between my bumper and the stopper/curb.

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post #9 of 34 Old December 7th, 2013, 02:11 AM
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Same here that's what I do.

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post #10 of 34 Old December 7th, 2013, 09:38 AM Thread Starter
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Quote:
Originally Posted by StevenMcTowelie View Post
...Nytrix negged me?
sorry, must have selected the wrong option and didn't notice I guess. I'll get you back next time it lets me.

Quote:
Originally Posted by jdmpwr07 View Post
After I got my splitter I barely pull up to concrete stops. Backing in FTW.
I back in because a lot of fender benders happen in parking lots with people backing out. My girl was coming to pick me up at work and she parked in the one damn parking space with a concrete block in the whole lot. So naturally I don't notice it and just put it in first and pull straight forward over the concrete block.

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Originally Posted by nathanielwilliam View Post
Increased flow and messed up cats will throw off your tune as your O2 sensors will be getting weird readings and your car will be trying to correct for it. Anything is possible but, i would bet that you just need some new cats.
The more I think about it, the passenger cat is probably damaged. I had an 87 performance tune loaded and I reverted to stock after the accident... and it seems to be running slightly worse now. Unfortunately I have no choice but to drive it a little bit for a couple days.

I want to install long tubes and offroad x but since I'm forced to do this now and don't have enough money for LT, I am going to have to waste money on just a full length offroad x. Either that or take it to a muffler shop. This is all of course assuming the passenger cat is the issue and nothing else is wrong.
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post #11 of 34 Old December 7th, 2013, 11:45 AM
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Also make sure you haven't bumped the oil pan. If you did you could have closed up the little clearance there is between the bottom of the pan and the pickup tube which can starve the engine for oil.

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post #12 of 34 Old December 7th, 2013, 11:59 AM
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Yeah if you think you lost some oil I would also check the oil pan, also your cats are probably fucked, get an offer!/r mid pipe and don't worry about the again



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post #13 of 34 Old December 7th, 2013, 07:02 PM Thread Starter
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I looked some more and the front wheels went over the concrete block and then came down on the frame behind the front wheels which is right where the cats hang down. Looks like I obviously need a new mid pipe.




The oil pan looked fine and I bottomed out further back anyway. I didn't really see anything else unusual except this hole in the back of the transmission which I don't really know what that's all about.


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post #14 of 34 Old December 7th, 2013, 07:14 PM
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That's the clutch inspection hole, it's supposed to be there

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post #15 of 34 Old December 7th, 2013, 08:19 PM
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Damn you fucked up those cats tho! lol good thing that's all it is!

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post #16 of 34 Old December 8th, 2013, 12:09 PM Thread Starter
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They were both crushed by the previous owner, I bottomed out on the right one.

I had to drive it yesterday and got a CEL P0430- Catalyst System Efficiency below Limit - Bank No 2.

pretty much as expected... but I checked the oil level and it has definitely dropped and turned black. Could the damaged cat cause this somehow with fucked up back pressure or do I have something else going on? I realize I should probably take it somewhere to get looked at.
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post #17 of 34 Old December 8th, 2013, 12:16 PM
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You have a dangerous situation here, if the cat has compressed the engine my be fighting to push the exhaust through the destroyed cat. This can lead to high pressure in that side of motor and cause damage. I suggest stop driving the car immediately until you can either replace the mid pipe or have the cat replaced

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post #18 of 34 Old December 8th, 2013, 01:34 PM
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I agree^^
A mid pipe is very easy to install, just take the bus, or carpool, or whatever you need to do while you wait for it to get here. It's a small price to pay to make sure your mustang is ok. I'd do an oil change with that midpipe swap as well, and keep an eye on everything

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post #19 of 34 Old December 8th, 2013, 01:42 PM Thread Starter
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I am flat broke for another week and then I have to order a part and wait on shipping... with no public transportation or any other means of getting around besides a skate board. The only thing I can think to do is take the mid pipe off and see if I can either fix/unplug the passenger cat... or basically chisel the shit out of both cats or something to make them both deletes or whatever you would call it.

Maybe I can come up with a couple bucks if I think about it or pawn something. Now I'm wondering if there is back pressure... that plus the explosions in the mid pipe might have worn out some piston rings or caused some engine damage; that would really suck.
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post #20 of 34 Old December 8th, 2013, 01:45 PM
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I'd try the chiseling cats out option. You'll get a CEL for it but it won't hurt anything. I'd be worried about driving around with black oil in there too

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