why would my exhaust manifold glow red when it starts to run ruff would it be cat converter

Asked by Oct 31, 2014 at 11:15 PM about the 1987 Chevrolet S-10

Question type: Maintenance & Repair

I have a good flow and pressure out tail pipe but you can feel it when
it messes At tail pipe has flowmaster exhaust but cat looks original.  
I put in new brain in distributor tonight

3 Answers


Stopped up cat can cause this. Did you do anything with the timing of the engine? If so timing issues might also cause to high of exhaust temps. But if you still running the factory cat I would just about bet it's stopped up. Is cat glowing red or another part of the exhaust.


Manifold glowing red? Are you sure you put the plug wires back on correctly? Did you just replace the ignition module or did you completely pull the dist out?

2 of 2 people found this helpful.

is the engine temp ok (195-205)? thermostat might make it run rich and eventually collapse cat.

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