Manifolds getting red hot

Tiny
BIG V
  • MEMBER
  • 1992 LEXUS LS 400
  • 2WD
  • AUTOMATIC
  • 130,000 MILES
Manifolds turning red hot. Had converters replaced and problem still exists. Need help.
Thursday, December 21st, 2017 AT 5:11 PM

3 Replies

Tiny
WRENCHTECH
  • MECHANIC
  • 20,761 POSTS
The problem is not the manifolds or converters. It is the engine not running properly. That will ruin your new converter in real short order.
You need to find out what the issue is with the engine. Start out by having the codes read.
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Thursday, December 21st, 2017 AT 5:31 PM
Tiny
BIG V
  • MEMBER
  • 2 POSTS
Thanks.
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Thursday, December 21st, 2017 AT 5:33 PM
Tiny
KHLOW2008
  • MECHANIC
  • 41,814 POSTS
Such problems should be due to a misfiring cylinder. When misfiring occurs, raw fuel is dumped through the exhaust and as the catalyst tries to burn off the fuel, it heats up resulting in the catalyst and manifold turning red hot.
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Thursday, December 21st, 2017 AT 8:54 PM

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