Hi Martin!
I don't want to start anything, either. I've tried to keep these replies respectful and without personal attacks with no name-calling or use of inflammatory terms. Although, I realize especially in this day, telling someone they were wrong, incorrect or mistaken can be seen as a horrendous personal attack that requires immediate cancellation regardless of whether they are correct or not. I don't think this is a place like that! I'm also aware of some of Hotrod Lincoln's history and abilities from reading posts on this site over the last few years. I'm very impressed with his work and knowledge.
I also don't want to make any more of this than necessary. I cringe a bit thinking anyone who called out something like this would be considered "accusing someone of spreading misinformation". I think it can be better termed as "telling someone they made a mistake". Or, maybe more precisely in this particular case "telling someone they exaggerated a bit by using a fact mixed in with some fictional hyperbole". Only after this is pointed out can we determine whether they really meant to say a catalytic converter added to a non-computer-controlled vehicle will "meltdown" because catalytic converters were only ever installed on computer-controlled cars. Or, that there were no trucks made with non-computer controlled engines/carbs and catalytic converters.
To that end, I'm happy to discuss further anything I stated if someone disagrees. I've tried to supply my own "evidence" of any corrections in my replies. If I'm wrong/incorrect, I'm usually happy to learn something new. Although, I'll freely admit I have an initial reaction of "I am NOT wrong/incorrect" when first presented with new information.
Now, to finally get around to answering your question.... I'm an electrical engineer (BS, MS with some PhD work) working at General Motors for the last 23 years. I'm currently working in the autonomous vehicle area. But, for my first 17 years at GM, I was responsible for developing engine controls and software for systems including gasoline engine torque estimation and control, fuel/spark delivery and exhaust after-treatment. The exhaust after-treatment work was done on "conventional" exhaust systems along with lean-burn/stratified charge engines. Here is a link to a patent our team received involving after-treatment for the lean-burn engine after-treatment system :
https://patents.google.com/patent/US9714625B2/en . If you click on my name (Donovan) on that page, you can see the entire patent list for everything where I was involved. Since GM keeps a tight seal on their intellectual property, I don't have anything beyond the patents I can share for more detail.
While this list feels nice to document here, none of it inherently makes me immune to making mistakes. Regardless of education or experience, I get things wrong. Probably more often than I care to admit. Once of the nice things about forums like this is that information can be shared and discussed so we can learn more.
Finally, as I eluded to in my previous reply, I don't think Hotrod was specifically "spreading misinformation". I do think he was exaggerating when saying installing a converter on a vehicle without computer-based fuel control would cause a "meltdown". We know, and he confirmed with his own example, he was factually incorrect about catalytic converters only being used on vehicles with computer-based fuel control.
