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Old 03-23-2010, 10:43 PM   #3347 (permalink)
F.I. Inc.
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Join Date: Feb 2009
Location: Simi Valley, CA
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Drives: 2010 GT-R/2007 F-250
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Quote:
Originally Posted by Darkstar87695 View Post
Hey Tony, I've had my exhaust on for about 2 months now and I have a few questions. I got my system intalled at my local Midas and they really seem to know what their doing. I say this because I have gotten to know them over the past few months and they have all the answers. My point is that when I originaly got it installed, they used paper gaskets to seal it instead of the high temperature silicon that is said to be used in the instructions. It was installed succesfully and all was well for the first few weeks. After that I began hearing a hissing sound when I let off the gas and as the car slowed down. It sounded like a leakage but I wasn't sure so I left it for a week or so. About this time my "service engine soon" light came on. I took it into the dealership yesterday and they told me I had a blown front gasket that was throwing the cars sensors off. Knowing this I immediately took it to Midas and they confirmed this. They then proceeded to reseal it with the high temperature silicon. We followed the instructions on the package completely. Even letting it sit 2 hours before tightening the bolts. Yet, as I drove away I could hear the same old hissing. I have not confirmed that the gasket has blown again but I would guess it is. I am not positive if it was just the front gasket that was blown but I believe that was the only one. My question is a simple "what should I do?". I could look into getting metal gaskets to seal it but I was just wondering what you thought on the situation. Thanks P.S. I had them check for any other sources of leakage and they did not see any. Thanks again.
First and foremost the guys at Midas need to stick to brakes and not touch these cars. Ha, ha, joking... Not really!

Ok, here we go. First off where did they get a paper gasket to fit that bolt configuration? 2nd, why did they not follow the instructions the first time? 3, please tell me that they DID NOT use the stock metal crush ring from the stock cats!!! Last but not least if they did, then they most likely warped the flange on the HFC which will not allow it to sit flush with the stock manifold flange. If they somehow managed not to warp the flange then they must not of used either the correct kind of silicone (YOU NEED HIGH TEMP RED) or apply a thick enough coat evenly. I do apologize for the inconvenience but this is exactly why I always tell people to follow the instructions.

The exhaust leak prior to the O2 sensor is without a doubt what is causing the CEL light.

If you would like, you are more than welcome to call me and we can discuss this. I am here to help, as ,much as I can...

Thank you, Tony

P.S.- No BS as I was spell checking this I just heard a Midas (BRAKE) commercial. Now that is irony if I ever heard it!
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