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Old 03-10-2010, 07:21 PM   #1 (permalink)
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Default Exhaust manifold overheating at 02 sensor

New to site, great info here. I own a stock 88 sammy with 75,000 miles, had it since '97. Engine idles great but stalls when driven. On a short trip one night the engine stalled and died. When I raised the hood the exhaust manifold at the oxygen sensor was glowing red. When the stalling problems first started occurring I sprayed the carburetor with cleaner, changed fuel filter, blew out fuel line from pump to filter. No change. Several years ago had a muffler shop replace muffler/tail pipe because it was rusted out. The catalytic converter maybe stopped up or rusted out. Any ideals where to start first. Thanks.
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Old 03-10-2010, 09:44 PM   #2 (permalink)
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It sounds like the thermal cutoff switch is killing your engine. Hopefully it's shutting down before it gets catastrophically hot. usually that kind of heat in the exhaust manifold is from a clogged catalytic converter, but exhaust temperatures can also be elevated from a Too lean mixture or a busted EGR valve. Could be a combination of any of these things too. If your exhaust manifold is getting that hot I wouldn't be surprised if your head is warped from the heat. This can cause a leaking head gasket if the face is warped or leaking valves if the valves or seats have become distorted. Hopefully you've found the problem before serious engine dammage has occured.
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Old 03-11-2010, 09:27 PM   #3 (permalink)
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Obviously Baratacus answered your question with much more knowledge than I have, but I had the same problem years ago on a Chevy I had. The manifold was also glowing red, wouldn't stay running. Mine was very sudden, though--it didn't take awhile to show up, it just did. It turned out that I needed a new catalytic converter.
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Old 03-11-2010, 10:03 PM   #4 (permalink)
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Quote:
Originally Posted by wrenchwoman View Post
Obviously Baratacus answered your question with much more knowledge
He hit it on the head. Experiance pays.
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Old 03-12-2010, 09:34 PM   #5 (permalink)
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Thanks everyone for your help. Will let you know the outcome.
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