Manifolds glowing red - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 06-30-2006, 11:14 PM   #1
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Default Manifolds glowing red

Just install my underdrive pulley and took the car for a spin. Noticed a small increase in power from 0-90 not much but some mostly around the shifting point. From 90-shutoff very nice increase in power. Only problem is after all that fun i could smell a hot smell, popped the hood and front manifold was cherry red, back was glowing but not as bad as the front. Checked the cat (first idea) and no glowing. Any one have an idea. Also is it safe to drive like that?
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Old 06-30-2006, 11:33 PM   #2
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For some reason, it seems that it is running extremely rich. Fiero'* were known to do that if the EGR tube was cracked.
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Old 06-30-2006, 11:37 PM   #3
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i would believe it is running rich because the tips are always covered in black carbon. And have been told it "smells like it is running rich". I dont understand why it would do it after a small thing like that underdrive pulley. How would i go about fixing it. Maybe something like resetting the computer maybe?
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Old 06-30-2006, 11:41 PM   #4
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well the main components that control the Air fuel mix...are the o2 sensor...might be old, make sure its a AC Delco, clean MAF sensor, and check air filter.
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Old 06-30-2006, 11:51 PM   #5
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recharged the k and n about a week ago. Going to do a new o2 sensor. Any more ideas.
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Old 07-01-2006, 12:01 AM   #6
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I say replace the cat. There must be a blockage somewhere.
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Old 07-01-2006, 12:26 AM   #7
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Quote:
Originally Posted by fantastic88
I say replace the cat. There must be a blockage somewhere.

x2

HOWEVER there should be a serious loss of power if its that bad.
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Old 07-01-2006, 12:32 AM   #8
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I dunno about a serious power loss, mine have glowed before.

If you're running 90-shut down, you're pushing some seriously hot exhaust.

I wouldn't be supprised if they were glowing.

I'd bet after my 126 run they were glowing on my motor
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Old 07-01-2006, 04:47 AM   #9
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Do you notice any decrease in power as the car heats up? When my 95 cat went thats what I noticed.
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Old 07-01-2006, 09:37 AM   #10
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Underdrive pulley? Which one? Crank? Water pump? Alternator? Please be specific.

Running lean is more likely to make the manifolds glow than running rich. Check your fuel pressure.

Cleaned the K&N? If any oil got on the MAF sensor after reinstalling, it could affect the reading or blow out the MAF. Clean the sensor. Instructions are in Techinfo.

Bang on the catalytic converter. Both up and down, and side to side. Any noise?

How old is the O2?
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