Alright so i drive a 98 prelude and im getting a check engine light that has to do with the rear o2 sensor sending a high voltage. Now while i was under the car i noticed a small leak right where the new catalytic converter was welded on. Basically the leak is about an inch long and is a missing spot that wasnt welded. Ive noticed decreased MPG and decreased power so i want to fix this leak to see if it solves my problem.
Took the car to a shop to see if they could give it a quick weld but my car was too low to get on the lift so im wondering if i could use some exhaust wrap instead too see if that will do the trick?
Please help and post suggestions. Im kinda stuck here. Thanks

 

JB Weld, I repaired a 1" crack in a weld on my 5Zigen SS exhaust where the muffler was welded to the tail pipe, that was 5 years ago, still good.

Apply when piping is cold, alow to cure for at least 24hr. 94

 

I will give it a shot. The crack is right after the catalytic converter though wich is hot as hell. You think itll hold up?

 

jb we'll won't hold up for long in an exhaust system


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As mentioned, I did a small repair 5 years ago on my SS 5Zigen exhaust and it is still good, and that is with a few years of autocrossing at WOT and a 75 shot ZEX system.

So saying it will not hold up long is an assumption. 94

 

Go grab you a 2x6 board and cut it to make small ramps to help get on to the lift. I have to carry mine whenever I put it on a lift. I am using some job weld to seal the bolt on exhaust tip I installed and it has held up for over 6 months.

 

Instead of JB Weld (which held up on an exhaust manifold for me for months before selling the car), why not just use an actual exhaust repair kit?

That one is only $6, and probably close to $10 at a local parts store...

 

Measure the difference in exhaust temperature between the cat and the muffler and see what you find.

Jb weld might hold up back by the muffler but not before the cat and certainly not at the cat.

 

I understand the internal temps of a cat are 1500-1800 degrees F, but that's internal more like 500-600 degrees external and less at the entrance/exit, and this is to seal a 1" un-welded section not to hold anything and should work fine as a temp. fix, as mentioned an exhaust repair kit would be better but then again welding is still the best bet.

The suggestion to use JB Weld was because it is an easy/quick, [temporary] fix, and most people have JB Weld on hand, to dismiss it as not going to work is a blanket statement and is wrong. 94

 

Ok, fine. As a temporary fix, sure. You'll notice I said won't hold up for long 'though.

 

All 4 guys have valid points behind their repair ideas of your dilemma. All would work. None of them is hard on the wallet. Your decision just needs to be based off what you know about any mentioned chemicals/kits, how long you want and expect the fix will or should last and finally how much you wanna spend and to what extent you want to do physically to fix the leak. Personally I have used the permatex kit and would swear by it. Used on any daily/project of mine that needed it, as well as the 6 different stock cars I have owned and raced back in Maine. Now that kit holding its own against the weather in Maine?? (especially the winters, for those of you that don't know, basically winter is 8 months of the year up there and is between -20 degrees and +15 degrees during those months. and summer months? yeah, cold day in hell when it gets above 85...) Those facts alone should prove the strength and durability of the Permatex Kit...

 

I've seen JB work on high temp exhaust applications and last over 5 years too. Gotta prep the surface properly and apply in and out of the hole so the exhaust backpressure doesn't just pop it off.