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Old 10-17-2017, 06:17 PM   #1
zerosl
 
Drives: 2008 Yaris S Hatchback
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Exhaust Leak

So I have an 08 but can't figure out where to start with this exhaust leak.

It is likely near the exhaust headers or downpipe as exhaust smell comes into the cabin if i have my HVAC to vent from outside.

Any suggestions for techniques or places to start looking?

Thanks
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Old 10-17-2017, 06:51 PM   #2
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With 99% certainty, it is the donut gasket between the header and the down pipe. An '08 is past due for replacement if still on the original Open the hood, start the car, and reach into that area with an open hand. You should be able to feel the gases puffing against your fingers.

This is what the gasket in my '06 looked like in November 2011. I am once again due for a replacement.



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Old 10-18-2017, 06:25 AM   #3
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^ +1 My money's on WeeYari's diagnosis. Mine was gone, but so was the entire flange. The cat pipe had completely separated from the manifold and was hanging down about 1/4".
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Old 10-20-2017, 07:58 AM   #4
zerosl
 
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do you have any part numbers?
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Old 10-20-2017, 08:19 AM   #5
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Toyota OE part numbers;

Gasket 17451-21070
Bolts 90080-10291

They are not what one would consider cheap.

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Old 10-20-2017, 08:20 AM   #6
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https://www.ebay.com/itm/Exhaust-Pip...72.m2749.l2649

This is the one I bought.
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Old 10-21-2017, 08:11 PM   #7
govtec
 
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How hard is this job to do it myself and what are the steps involved to change out the gaskets and bolts? Thanks
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Old 10-21-2017, 08:25 PM   #8
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Originally Posted by govtec View Post
How hard is this job to do it myself and what are the steps involved to change out the gaskets and bolts? Thanks
If you live in salt belt. The bolt is likely rusted, and you will need to heat the bolt till red to take it out. It's not a job to crawl under to do.

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Old 10-21-2017, 08:31 PM   #9
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Ok, I might just take it to Midas.
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Old 10-21-2017, 08:44 PM   #10
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Ok, I might just take it to Midas.
That's probably the best thing to do because they do tend to rust badly with moisture and continual heating/cooling cycles. That said I have removed pretty rusty ones by soaking them a few times with ReleasAll or similar and used my electric impact gun. I can't see a muffler shop charging much at all to replace that donut.
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Old 10-21-2017, 09:10 PM   #11
IllusionX
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Originally Posted by 06YarisRS View Post
That's probably the best thing to do because they do tend to rust badly with moisture and continual heating/cooling cycles. That said I have removed pretty rusty ones by soaking them a few times with ReleasAll or similar and used my electric impact gun. I can't see a muffler shop charging much at all to replace that donut.
It was a good 20mins job.

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Old 10-23-2017, 09:51 AM   #12
zerosl
 
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Ordered the parts from RockAuto

Order Parts List:
EASTERN EXHAUST EE4979 Springs
EASTERN EXHAUST EE4978 Bolts
FEL-PRO 61502 {#1745121070} Flange Donut Gasket

Parts should arrive friday and will tackle on saturday

I have access to a four post lift and will hopefully will tackle this quickly
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Old 10-23-2017, 11:58 AM   #13
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I had the same problem, no leak, but a noise and couldnt figure out where it was coming from. Turned out to be this flange gasket. Toyota wanted almost $50 for it and I got it from a local parts shop aftermarket for $8. Had to sand it a little to get a perfect fit. After that it was fine. Reused same bolts and put antiseize on threads.
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Old 10-28-2017, 11:49 AM   #14
zerosl
 
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well, I started on this job and the bolts were so corroded that they both snapped.

I may well call it a day
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Old 10-28-2017, 02:09 PM   #15
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I was able to cut away the bolts between the flanges, but will need a longer drill. I replaced the donut gasket and clamped it shut with a U bolt until I come back to it after purchasing the correct parts

Noise is gone, but now I have a P0031 fault code.

I wonder if I damaged the O2 sensor while messing around?

nightmare fuel
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Old 10-28-2017, 02:53 PM   #16
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I wonder if I damaged the O2 sensor while messing around?
Maybe the wiring which is not far from the flange. Could you have nicked a wire with your drill bit? The downstream sensor has 4 wires. Not sure about the upstream wideband sensor.
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Old 10-29-2017, 08:31 AM   #17
zerosl
 
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yea, its possible, I'll start checking the part once I have a free cycle
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Old 11-16-2017, 11:45 AM   #18
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So I'm guessing my P0031 corresponds to bank 1 sensor 1 which is the upstream.
The more difficult one, should I go from the top or bottom?

decided to use two of these flange repair
https://www.autozone.com/emission-co...277182_0_17365
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