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Originally Posted by Cadillakin'98
Have you drivin the truck after you changed the thermostat? Just wondering if the smell is indeed coming from your truck or possibly just something near where you parked. If it is in fact coming from your truck, does it have more like a rotten egg type smell? If so, 99.9% sure it is your catalytic converter. Don't have the scientific reason like J-Ri, burt he is right that water in the tail pipe is common. I just always thought it was condensation. Guess we do learn something everyday!
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I just changed my O2 sensor last week. I have a 91 1500 and that was the original rusty sensor. What I did to get it off was to drive the truck until the pipe was really hot then I hit it with a good dose of PB Blaster and waited about 10 or 15 minutes. Remember to put on gloves before you try to wrench it off..... I Used an adjustable wrench and put some weight on it and it spun right off. Also if you havent done so already, check your EGR valve. The diaphram inside of it might not be holding vacuum, mine was shot too and cost about $55 bucks to replace. I would suggest you check all the vacuum lines to make sure they are not leaking and check the flow out of the injectors to make sure they are not spraying unevenly. If they are they might be clogged or the fuel pressure regulator might be in need of a rebuild. The pain in the ass about all computer controlled vehicals is one sensor can confuse the hell out of the computer. I have been trying to pass inspection on my truck for the past 2 weeks and it is costing me a small fortune in parts my HC was 4.30 and it should be 1.60 I am almost done and the exhaust is smelling so much better now.