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Discussion Starter · #1 ·
I crushed my tailpipe on a rock, and opened it most of the way back up (still a little dented up top, and crinkled around the edges). I also went through some decent mud and even a little water. Performance seems the same - gauges (temp & RPMs) seem normal, too. It just sounds like I added an aftermarket exhaust! Real throaty, and it rumbles pretty loud when I give it the gas.

Is this explained by the tailpipe, with no ill-effects to the FJ? Or, is there a bigger problem? Is it not related to the exhaust at all (if water got somewhere it shouldn't have)? One of the guys on the trail with me spent a good deal more time in the water, and got some in his trans... but it didn't sound like this.

Any ideas? I don't mind the extra decibels, but if it's indicative of another problem, I'd like to know.

Thanks!
 

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If you impacted the exhaust, it may have opened up a leak upstream. I'd start it up and slide under there on a creeper; having it in park and parking brake on of course. You should be able to hear where the leak is, in a general sense, or even see it. A muffler shop would do it for you.. Doesn't sound like a water issue to me. Ron

I crushed my tailpipe on a rock, and opened it most of the way back up (still a little dented up top, and crinkled around the edges). I also went through some decent mud and even a little water. Performance seems the same - gauges (temp & RPMs) seem normal, too. It just sounds like I added an aftermarket exhaust! Real throaty, and it rumbles pretty loud when I give it the gas.

Is this explained by the tailpipe, with no ill-effects to the FJ? Or, is there a bigger problem? Is it not related to the exhaust at all (if water got somewhere it shouldn't have)? One of the guys on the trail with me spent a good deal more time in the water, and got some in his trans... but it didn't sound like this.

Any ideas? I don't mind the extra decibels, but if it's indicative of another problem, I'd like to know.

Thanks!
 

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Discussion Starter · #3 ·
If you impacted the exhaust, it may have opened up a leak upstream. I'd start it up and slide under there on a creeper; having it in park and parking brake on of course. You should be able to hear where the leak is, in a general sense, or even see it. A muffler shop would do it for you.. Doesn't sound like a water issue to me. Ron
Thanks, Ron! I called my old man, and he said roughly the same thing. Is it something that absolutely needs to be fixed? I don't mind the sound if there's no ill-effects.

If it does need to be fixed, is it generally an easy fix? I know I'm asking for a lot of diagnosis without much info, but this way I don't get screwed by a muffler shop I don't know...
 

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I think Ron is on the right track, only other thing I would do is check the air cleaner and make sure it is OK and seated in place. It will also be easier to check the exhaust if you have someone hold a rag over the end on and off as well. Good luck!!
 

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I would want to know exactly what was causing it. For me (and my FJ) I would want it fixed. If there's a leak upstream, and I suspect that's the case, it may produce "unwanted" issues with your tuning, computer, etc.. It's hard to estimate the difficulty/cost of a fix, without knowing what the problem is. Could be something as simple as a bent support causing a connection, a hole on the muffler or worse case a trashed pipe/muffler. I'm fairly certain that you could get one from someone on the forum, that has replace theirs. Personally, if I trashed my exhaust I'd install a TRD, AFE or Borla cat-bak.. That'd be all the excuse I'd need. Ron

Thanks, Ron! I called my old man, and he said roughly the same thing. Is it something that absolutely needs to be fixed? I don't mind the sound if there's no ill-effects.

If it does need to be fixed, is it generally an easy fix? I know I'm asking for a lot of diagnosis without much info, but this way I don't get screwed by a muffler shop I don't know...
 

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If it's sounding 'throatier' then I'd suspect a crack or break where the tailpipe meets the muffler. The other guys are right, you've got another leak somewhere, and it needs repairing. You don't want to risk the chance of exhaust gases getting inside the cabin (especially with warmer weather here and windows rolled up with A/C).
 

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Yeah, you don't want CO leaking into the cabin with the windows up. It could cause you to pass out and die or kill others. It is unlikely, but it can happen. If you feel dizzy or a slight headache, get out of your car immediately.
 

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Good plan.. You need to know what's under there anyhow. Pick up a cheap creeper on the way home, let everything cool down and pull yourself around under there. Look around and see what you find... Then start it up and do the same.. Ron

PS: I'm still using a cheep $10 wood creeper that I bought around 1973!

Thanks - you guys are a big help! I guess when I get home this afternoon, I'll crawl underneath and see what I can find. ~Joe
 

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I had the same thing happen on the trial. The exhaust become noticablly louder. When looking underneath I noticed the tailpipe making contact with the insulation under the floor. I pulled down a little and it popped back into place. What had happened is one of the rubber exhaust hanger grommets had flipped upside down causing the exhaust to hang higher up towards the floor. When this flipped back down everything fell back into place and the sound was back to normal.
 

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There ya go.. Vibration rather that an actual exhaust tone change. Sometimes it's hare to diagnose a noise. Ron

I had the same thing happen on the trial. The exhaust become noticablly louder. When looking underneath I noticed the tailpipe making contact with the insulation under the floor. I pulled down a little and it popped back into place. What had happened is one of the rubber exhaust hanger grommets had flipped upside down causing the exhaust to hang higher up towards the floor. When this flipped back down everything fell back into place and the sound was back to normal.
 

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Discussion Starter · #13 ·
Well... I'm wearing work clothes, so I couldn't really get under the truck, but did pop a squat, and the tailpipe is indeed touching the insulation. It looks exactly like your picture (except more mud and a dent in the pipe instead of the muffler).

So, I'm hoping that's all it is! After work I'll change and roll under there and see if I can't get it back into place.

Thanks, Flying Brick!

~Joe
 

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Well... I'm wearing work clothes, so I couldn't really get under the truck, but did pop a squat, and the tailpipe is indeed touching the insulation. It looks exactly like your picture (except more mud and a dent in the pipe instead of the muffler).

So, I'm hoping that's all it is! After work I'll change and roll under there and see if I can't get it back into place.

Thanks, Flying Brick!

~Joe
No problem. My tailpipe was also bent at the exit but I had bent it back with a floor jack handle prior to the pic. When you look at the hanger you will see the oval shapped rubber hanger and at first glance it will look normal but it may be rotated upside down. The one on mine that was rotated if I remember correctly was the one just in front of the muffler looking towards the front of the FJ. I took a little bit of force pulling down on the tailpipe then the hanger just flipped back into position and there will be several inches of gap between the tailpipe and insulation as normal.
 

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Discussion Starter · #16 · (Edited)
FIXED!

Brick hit the nail on the head - 12 seconds under there, a pull and twist, and the rubber hanger rolled right over. There's now a good gap between the pipe and the top there, and it sounds completely normal.

12 seconds, $0.00 and peace of mind. :bigthumb:

Thanks, guys!


BTW - if you're ever in the DC area, I'll buy you a beer!
 

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FIXED!

Brick hit the nail on the head - 12 seconds under there, a pull and twist, and the rubber hanger rolled right over. There's now a good gap between the pipe and the top there, and it sounds completely normal.

12 seconds, $0.00 and peace of mind. :bigthumb:

Thanks, guys!


BTW - if you're ever in the DC area, I'll buy you a beer!
Glad your back in action!:)
 

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