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Exhaust gets red hot when running

The cat turns cherry red its a brand new exhaust

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Have you checked for any fault codes, get the car checked for codes, if it is getting that hot it could cause a fire.

Posted on Apr 18, 2014

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Replace timing belts crank sensor runs rough at idle an exaust gets cherry red


This could be several things. One is obstructed CAT. The most common cause though is the engine is running so rich it is dumping unburned fuel into the exhaust. This could be a bad injector sticking exhaust valve, constant misfire etc. Don't run it like this or you will end up with a pile of charcoal and steel where your car is supposed to be.

Oct 07, 2015 | 2001 Kia Optima

1 Answer

99 Mercury Cougar cat glowing red. Replaced thinking it was plugged and still glowing cherry red with exhaust unhooked.


Im guessing the ck engine light is on? Something is dumping gas and heating up cat, you need to check have scanner hooked up and engine data looked at...look at long and short fuel trim, tis will tell you what's going on or at least give you a direction to go.I wouldn't drive it, gonna ruin new cat

Feb 21, 2014 | Mercury Cars & Trucks

1 Answer

7.4 vortec number 2 cylinder dead. Getting spark. 160 lbs compression. Cat converter getting cherry red. What could the problem be?


If the fuel injector on that cylinder is supplying too much fuel it can result in a fuel-fouled plug. This will not allow for combustion even though the plug tries to fire, then the fuel will be ejected into the exhaust stream and burned in the cat. This causes the cherry red. This is something to have checked quickly. The excess fuel will damage the cylinder walls and destroy the cat.

Nov 04, 2013 | Cars & Trucks

1 Answer

05 acura tl had both heads replaced and the rear bank is running very rich


since you have a cherry red catalyst surely you have a clogged cat and if you do emission test surely is going to indicate the catalyst. now if the one of the cylinder heads is running rich just confirm whether you have any injector with a malfunction and instead spraying the fuel is pouring the fuel and cause fuel to go through exhaust not burnt and possible that is the reason which damaged the cat.

Sep 01, 2012 | 2005 Acura TL

1 Answer

When warm runs rough sets knock sensor code will hardly idle turn front cat cherry red car sat for a year put new gas in it when cold runs great


If the cat is cherry red as you say it is I would check the firing order or timing they may have crossed plug wires this will cause the exhaust manifolds to get red hot and glow let me know if this heled you and good luck.It definitely sound to be timing related or crossed wires.

Feb 09, 2011 | 1999 Mercury Villager

1 Answer

1995 Boneville 3.8 no supercharge. starts and idles fine but when reved up to about 2000 rpm starts missing/backfiring badly.exhaust would become red when reving up.removed cat converter did not look bad...


you need to check the 02 sensor that is on the engine

the converter is probably blocked if it is turning cherry red.

try putting some fuel cleaners in your system like heet from auto zone

you need to make sure the wires are in the right order

make sure there are no breaks in the wire

if you have a check engine light, you should take it to auto zone to get it tested for a better insight

Dec 05, 2010 | 1995 Pontiac Bonneville

2 Answers

New catalytic converter gets red hot


clogged , check the rest of your exhaust after cat to see if it gets hot

you can buy a no contact thermometer for less than $55.00

but the shop that installed the cat should have that

good luck

Jun 03, 2009 | 1989 Isuzu Trooper

2 Answers

Exaust getting too hot wont pass emissions


This is usually caused by it being plugged. The longer the exhaust is in the unit the hotter it becomes. They are very hot when new but over time they become restricted with deposits and the increase in heat is great. Usually it will also hinder the cars performance.

Jan 31, 2009 | 1987 Buick Regal

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