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Old 10-31-2019, 3:56pm   #1
mrvette
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Default '99 3500 van Vortec

Engine runs ruff, and then has no power, and sets codes saying lean on both banks, parts store guy sold me a can of Cat converter cleaner, because they get clogged, I never heard of any cleaner to use in the fuel/toss in the tank, so anyone hear of this??

AND I reset the codes, engine fine for a few minits, the codes reset.....

anyone any clues???

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Old 10-31-2019, 4:24pm   #2
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Convertors can get clogged. Never heard of anything to clean them, just replacing them. Could it be injector problems?
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Old 10-31-2019, 5:09pm   #3
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Start with the basics - new plugs, gapped properly, and new coil packs, if so equipped. Replace them all at the same time.
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Old 10-31-2019, 8:27pm   #4
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Quote:
Originally Posted by MrPeabody View Post
Convertors can get clogged. Never heard of anything to clean them, just replacing them. Could it be injector problems?
Also check the mass airflow sensor.Any cylinder misfire codes?
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Old 10-31-2019, 8:34pm   #5
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Before you spend a cent on parts... if the converter is clogged there will be almost zero gasses at the tailpipe. Put a hand near the exit and have the Mrs rev the engine. If no blow... replace the cat.
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Old 10-31-2019, 11:39pm   #6
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I was thinking bad spider but that would be rich not lean

https://troubleshootmyvehicle.com/gm...uel-injector-1
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Old 11-01-2019, 12:22am   #7
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If its a clogged converter you should be able to tell by the temp of the exhaust before and after the cat.
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