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1995 Toyota Corolla cracked exhaust manifold

Tiny
JWEVERMAN
  • MEMBER
  • 1995 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 240,000 MILES
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
Wednesday, October 28th, 2009 AT 11:21 PM

3 Replies

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
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.
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Thursday, October 29th, 2009 AT 10:31 AM
Tiny
JWEVERMAN
  • MEMBER
  • 2 POSTS
Yes the heat shield has vents and there is a bracket attached to the underside.
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Thursday, October 29th, 2009 AT 11:19 AM
Tiny
MMPRINCE4000
  • MECHANIC
  • 8,549 POSTS
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.
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Friday, October 30th, 2009 AT 9:04 AM

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