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2005 Chevrolet Trailblazer Question: what is causing my exhaust manifold to crack?

 

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jdv6565, 4.2L 6 Cylinder, Cumberland, MD, January 14, 2014, 14:19
 Rookie

we have a 2005 chevy trailblazer and we are getting ready to replace the 2nd exhaust manifold in 2 years. what is causing it to crack?!

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  • Answer #1

    Tires Too (133 Answers) , Londonderry, NH - (603) 473-4287
    tires too January 14, 2014, 14:29
     Journeyman

    High heat would cause the manifold to crack. Is the vehicle running lean? Any DTC's? How's the vehicle run? How is fuel economy? Does the exhaust smell funny?

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    jdv6565, January 14, 2014, 14:35
     Rookie

    no to all questions and fuel economy is fair and i should add that it has never registered above normal temps on the guage

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    tires too, January 14, 2014, 14:42
     Journeyman

    I got nothing else for you right now, sorry. Like pushrod mentioned, it could be low quality part or installation issue, but I don't know. I'll let you know if I come up with anything else.

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    pushrod January 14, 2014, 14:29
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     Master

    Low quality part, incorrect torque/sequence or improper gasket is my guess. Crack at the same place each time? Is the rest of the exhaust system secured properly?

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    jdv6565, January 14, 2014, 14:34
     Rookie

    yes exact same place

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    pushrod, January 14, 2014, 14:36
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     Master

    Hum.... where did the replacement come from?

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    jdv6565, January 14, 2014, 14:38
     Rookie

    stoystown auto parts. a very large auto part business in our area. it was a "new" a/m part

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    pushrod, January 14, 2014, 14:44
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     Master

    I put 3 am's on my Corolla that did the same thing! Got a used one from salvage, no more problems! Now that was MY experience. Just saying.

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    ziptie12, January 15, 2014, 16:30
     Master

    that says a lot........

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    bb1msu1, October 13, 2014, 18:47
     Rookie

    I replaced my manifold on my 2008 Trailblazer at 71,000, got the part from O'Reilly's. Now a year later and 91,000 it's cracked again in the same place. What's the problem?

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