cat glows red hot on idle!
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Member
Joined: Aug 2001
Posts: 446
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From: Stratford, Ontario
Car: 1984 Z/28
Engine: 383 stroker
Transmission: T-5
cat glows red hot on idle!
Wow...long time no see. Anyway, here's what I've got...
383 stroker
RPM Airgap intake
Holley 670 cfm Street Aveneger carb
SLP 1 3/4" headers to 3" y-pipe
high-flow Catco cat
3" I-pipe
Flowmaster muffler
Everything is fresh and new. The cat glows red hot on idle. Anyone seen this before? It's pretty freaky. Any thoughts on how one might go about resolving this pesky little issue?
383 stroker
RPM Airgap intake
Holley 670 cfm Street Aveneger carb
SLP 1 3/4" headers to 3" y-pipe
high-flow Catco cat
3" I-pipe
Flowmaster muffler
Everything is fresh and new. The cat glows red hot on idle. Anyone seen this before? It's pretty freaky. Any thoughts on how one might go about resolving this pesky little issue?
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Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Anytime I've ever heard of a cat glowing red was when it was bad/clogged. My buddy also had that problem, but he was running too lean. He said when he fixed the lean condition, it stopped glowing red.
Last edited by IROCThe5.7L; Jan 28, 2006 at 12:59 PM.
I had this happen on my wifes old 88 buick regal we once had. It was running very rich (bad coil pack) and it was glowing cherry red. I figured that the extra fuel in the exhaust was heating the cat up much hotter than normal and caused the glowing.
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Senior Member
Joined: Feb 2005
Posts: 540
Likes: 1
From: Fort Worth TX
Car: 89Z28 Vert
Engine: 350/tbi
Transmission: 700r4
Axle/Gears: 3.27 Posi
yes you are more than likely running really rich i was working on a car that did this found the problem in the ignition system and make sure to inspect the cat now that its been overheated now
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Joined: Aug 2005
Posts: 315
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From: Columbus, GA
Car: 1986 IROC Z28
Engine: 350 carbed
Transmission: TH350
Axle/Gears: 3.43
I had this problem before with my camaro. The carb was dumping way more fuel than it could burn due to a blown power valve. The excess fuel ignites in the cat due to the extreme temp which is it's whole purpose in the first place. I got one so hot that the welded seems split. A new power valve, spark plugs and wires, coil, and cat later, I was good to go.
Moderator
Joined: Jul 2001
Posts: 5,225
Likes: 70
From: Buffalo, NY
Car: 1988 IROC-Z
Engine: 427 SBC
Transmission: ProBuilt 700R4
Axle/Gears: Moser 12 Bolt / 3.73 TrueTrac
Originally posted by IROCThe5.7L
Anytime I've ever heard of a cat glowing red was when it was bad/clogged. My buddy also had that problem, but he was running too lean. He said when he fixed the lean condition, it stopped glowing red.
Anytime I've ever heard of a cat glowing red was when it was bad/clogged. My buddy also had that problem, but he was running too lean. He said when he fixed the lean condition, it stopped glowing red.
^ Idiot. Meant rich condition.
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Joined: Dec 2003
Posts: 192
Likes: 0
From: Va
Car: 92 camaro
Engine: 355
Transmission: 700r4
Its running really rich. The coverter is red hot because it is trying to burn all the excess fuel. It also could be a dead cylinder dumping fuel as well. Make sure your not missfireing if not backprobe the 02 sensor and see how rich it is running. Then take off the cat and look at it.
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