August 19, 2024
Exhaust done - new muffler, repaired tailpipe (didn't realize it was also damaged from backfire), new exhaust hangers, and exhaust leak fixed at the downpipe. $230 out the door, and the car runs QUIET! I'm sure the neighbors will appreciate that.
Anyway, with the help of a local Volvo wizard, I began investigating why the car had such a massive backfire. First off, it looks like the carbs are running very rich, so I'll be double-checking my work from when I rebuilt them a couple months ago. Additionally, my new points are already degrading and pitting. I purchased some of the cheapest ones available, so I shouldn't be surprised. Nonetheless, looks like I'm getting a weak spark. Combine weak spark with the excess of fuel from the SU's, things start making sense.
Pertronix upgrade time! I'd been wanting to run Pertronix on one of my cars for a while, and considering this car's astronomical miles and engine wear, this is a good candidate.