Why Exhaust Manifold get Red-Hot on a 2007 Toyota Camry 2.4 le?
Jul 6, 2026 at 1:18 PM
Exhaust manifold Red-Hot?
JOE1953
- MEMBER
- 809 POSTS
What to check next
Diagnostic guidance. Suggested checks and possible repairs are separate from the owner's reported results.
Stop running or driving the vehicle while the exhaust is visibly glowing and arrange professional inspection. Have the reported cylinder-three and cylinder-four misfires investigated before further heat damage occurs. Exhaust restriction should be tested rather than assumed. The codes identify misfire activity but do not establish whether ignition, fuel delivery, mechanical condition or another fault caused it.
Guidance references and applicability
Source discussion: question 1712989 https://2carpros.com/questions/exhaust-manifold-48437351--1712989 Supports the reported history and outcome only. Follow-up guidance is editorial synthesis; unverified specifications and diagnoses are not adopted. HELLA: Ignition-coil diagnosis https://www.hella.com/techworld/uk/technical/car-electronics-and-electrics/check-ignition-coil/ General ignition diagnostic background; example-vehicle values are not specifications for this question. Walker: Exhaust diagnostic testing https://www.walkerexhaust.com/support/tech-tips/simple-diagnostic-testing.html General support for testing restriction rather than identifying it from symptoms alone. Not proof of converter failure in this vehicle.
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Hi Joe,
A clogged catalytic converter can cause this problem, here is a guide to help see if that is the problem.
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter/
Please go over this guide and get back to me.
A clogged catalytic converter can cause this problem, here is a guide to help see if that is the problem.
https://www.2carpros.com/articles/how-to-test-a-catalytic-converter/
Please go over this guide and get back to me.
Jul 7, 2026 at 7:38 AM
the car have a misfire on #3 and #4 Cylinder and the codes are P0300, P0303, P0304. will that cause Exhaust manifold to get red-hot?
Jul 7, 2026 at 1:22 PM
Yep, that can do it, here is a misfire guide please go over it.
https://www.2carpros.com/articles/engine-misfires-or-runs-rough/
https://www.2carpros.com/articles/engine-misfires-or-runs-rough/
Jul 7, 2026 at 6:05 PM
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Discussion summary
Exhaust manifold Red-Hot?
The owner of a 2007 Toyota Camry 2.4L reported a red-hot exhaust manifold and later supplied P0300, P0303 and P0304 misfire codes. Exhaust restriction was initially suggested, followed by misfire investigation. No test results or repair outcome followed.
Reported outcome: No cause or successful repair was confirmed.
The operating conditions when the manifold glowed and the results of ignition, fuel, mechanical and exhaust tests were not supplied.