While I was driving the other day, my truck suddenly developed an exhaust leak instantly. Kinda sounds like an old volkswagon now. Anyways I looked for the exact location of the leak and to my suprise i found a bolt missing. Actually I'm not sure if it's a bolt or if it was a stud & nut, but if your standing on the driver side facing the engine, its the lower right bolt that festens the exhaust header to the engine. It's just gone, nothing but an empty hole. Can these things just work loose and fall out? If it is a stud instead of a bold, will it be hard to fix?
How can a stud just come out like that? And should it be blowing exhaust gas out of the hole like it is? If threads are messed up, will it be a pain to fix?
Vibration, threads got pulled out, stud was loose; there are different reasons why that would happen. You have the trunk, you may be able to tell us what happen better than we can tell you. You have different metals there with different expansion rate, if it is not properly torqued down, many things might happen.
When there is no force clamping down on the gasket and manifold to the head, they can not do their job in sealing the exhaust gas from pushing its way out from the gaps. There is a good chance that the stud had been missing for some time, and the gasket may have burnt out, and the exhaust manifold mating surface could be warped.
The thread can be a pain to fix, but not a big pain, you can install Helicoil or Timesert in there to repair the threads. And hopefully, you don't have to go any further than that.
N.E.O.
Last edited by new echo owner; 09-14-2008 at 11:05 PM.
This happened to me few months ago and headed to Toyota Dealership coz I was too lazy to run to the PicknPull and got charged $7.00 + tax for heat treated bolt and nut.
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"You'll never know til you try"
07 Toyota Camry
02 Honda Civic EP3 - AEM V2 CAI, Greddy Exhaust, DC Sports accessories
Glock 17 & 34
Sold = 89 - 22R-E, 4x4, 5speed, Xcab, 31x10.5
i made a double nut setup,ground a nut down to half its thickness,then used it to lock the heat treated nut in place while i screwed the stud in all the way.i did this without pulling the manifold it worked pretty good.loosen the lock nut and then tighten the heat treated nut the rest of the way down.i put the half nut back on after i tightened the heat treated nut.the old stud nut backed off and did what you said all a sudden i got instant exhaust noise from the leak.
Kinda had the same thing happen last month, started up my truck to this horrbily loud rattling.
When I looked at the exauast, one stud was missing and all the nuts were gone. I got new nuts hooked up to the remaining two (or 3?) studs and torqued it up to spec but it still has a gnarly exhaust leak. My gas mileage is only running at 16.5 on the 22R-E. Could this leak be affecting that perhaps?
It sounds like I need to get that gasket replaced, was considering getting a new exhaust system in a month or two anyways. Would it worth getting a new gasket in there now then?
^Fix the manifold you have and then replace the rest of the exhaust system. I hear the stock manifold will allow a bit more bottom end torque than a header, although peak horsepower (which you rarely if ever need on a truck like these) may be a little better with a header. Not sure if this is true, but Ted (engnbldr) told me not to waster my money on a header and just stick with the stock manifold, then free up the rest of the exhaust from there, and he seems to know what he's talking about.
Quote:
Originally Posted by DubVipers
thats what she said
*DubVipers is castrated by other forum enthusiasts*
I found out today that Seafoam is a great tool for finding exhaust leaks. -_-
As soon as I poured it into my vacuum line white smoke came from the exaust manifold near the number 4 cylinder. looks like my exhauset gasket is burned up or something. crap.
fix the leak the difference in torque and MPG is huge. and the annoyance is another factor. oh and if the threads are gone get a helicoil kit and any good part place should be able to help.
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