1995 Toyota Corolla cracked exhaust manifold

1995 TOYOTA COROLLA
240,000 MILES • 4 CYL • FWD • AUTOMATIC
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JWEVERMAN
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  • 2 POSTS
I have replaced the exhaust manifold on my corolla three times. It keeps cracking down the middle of the exhaust manifold. I replace the manifold and header gasket each time. Please advise
Oct 28, 2009 at 11:21 PM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
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It is either a cheap manifold or you have a lean/rich mixture.

Does heat shield have cooling slits in it or is it one solid piece?

Also there is a brace under manifold that braces it to block, if missing it will cause the manifold to crack.
Oct 29, 2009 at 10:31 AM
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JWEVERMAN
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yes the heat shield has vents and there is a bracket attached to the underside.
Oct 29, 2009 at 11:19 AM
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MMPRINCE4000
  • ✓ASE Certified Mechanic
  • 8,548 POSTS
  • ASE Certified Mechanic
Do you notice manifold glowing red?
Do you have a check engine light?

Another possibility is a bad motor mount, with engine running, open hood and have a friend "blip" throttle if you see excessive engine movement, then a mount is loose, collapsed or broken.
Oct 30, 2009 at 9:04 AM
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