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My mom took my 91 to do errands today and she said it started smoking really bad and wouldn't run right. It's now leaking coolant out the tailpipe and won't turn over. I'm assuming the engine's blown, but hoping that it could be something else. There's also a lot of coolant near the reserve...

I just pulled the codes on my 91 sport and got a code 41, no heated oxygen sensor switch detected, right side, according to the Haynes manual. First question, does this mean I need to replace that 02 sensor? Secondly, where do I find this sensor? And lastly, Does "right side" indicate...

After I shut my truck off I can hear a strange thumping noise coming from the passenger side. It only happens when i've had the heat on and moves around if I move the slider from defrost to floor, etc. Is this normal or something I should investigate? I've only had this thing like 3 weeks...