We think the catalytic converters need replacing as there was a strong smell of rotten eggs. Further issue is the truck is idling very rough. We think one fuel injector is not working and spraying fuel to the point of doing damage to the catalytic converter. The truck sits idle for many months in the winter as we live in Colorado and use the truck to put a Lance Camper on it.Thoughts?
The sulfuric odor may be too much fuel, a rich condition caused by too much fuel pressure, bad regulator or no vacuum to the regulator . Bad O2 sensor , linked return line , stuck open injector pintles etc. .
This rich condition will cause the rough idle issue also and can eventually hurt the converter/s .This rich condition will cause the rough idle issue also and can eventually hurt the converter/s .
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Your catalytic converter is plugged up,
If you check the exhaust output at the tailpipe you will find it restricted.
Let me know if I can assist further.
Lone99star
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You need to check fuel pressure while starting it and at idle and while driving to see if its low or dips or surges indicating pump or filter or regulator issues.
I also recommend a new set of motor craft spark plugs be installed.
The smell is being caused by unburnt fuel overheating the catalytic converters.
After the above procedures check for any signs of vacuum leaks especially on the PCV tube from the valve cover to throittle body and do a fuel system service
The problem you describe is almost certainly a bad/stopped-up catalytic converter. Not fuel line, not trunk seals, not head gasket or anything else. The fuel line answer is just wrong. If your catalytic converter is bad or stopped up, you will also almost certainly need to replace the Oxygen sensor as well.
You didn't say it smells like rotten eggs or sulfur, but that is the most commonly-stated description...it isn't accurate; a bad converter smells like a bad converter. Most people find the odor similar to rotten eggs or sulfur. A clogged exhaust system will shut an engine off after a short time due to backpressure and excessive temperature buildup.
Your check engine light should also be on. Read any diagnostic codes the PCM has set. I'm fairly sure your problem is the catalytic converter...
Steve Johnson, Wrenching GM Cars/Trucks For 40 Years
check O2 Sensors, add a product called Ametech restore at next oil change, this does wonders for your vehicle, improved my BHP & MPG threefold , also as you say it smells bad (Like rotten eggs?) this will be the catalytic converter, either replace or add a product called cataclean to the fuel & take it for a run, It literally cleans all the **** fro the catalytic converter removing that rotten egg smell
Your catalytic converter is plugged up,
If you check the exhaust output at the tailpipe you will find it restricted.
Let me know if I can assist further.
Lone99star
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