'78 280Z Restoration - HLS30-436195

Hey all, wanted to start a thread to track the restoration of a 1978 280Z I got in April. This is my first personal restoration/project car I've undertaken so much of this is learning as I go and just fumbling through it. Photos of the car/progress will be kept up-to-date within a Google Photos Album (will likely cull stuff periodically to save space). Current focus is getting it mechanically sound enough that I can just take it out and drive it. At that point I'll start on the rust repairs.

April 4th

According to the previous owner (Brian) and verified by documentation provided to me during purchase the car was originally an Arizona car. I'm unaware if that was the first owner but may track that down at some point. Story given to me was that the Brian had bought the car during High school in 2014 as a project but largely sat unused.

At time of purchase the odometer read 44,286 miles. According to Brian this is the original miles and it had not rolled over. Previous title odometer reading indicated 40,000mi. As such I'm skeptical as to whether or not that's true. That being said one of the first things I did after getting the car home was to run a compression test on all 6 cylinders. Given they all tested in at 170-175 does give some minor credence to the possibility.

Furthermore the car ran at time of purchase, albeit not well. I was additionally informed that the brakes were also largely non-functional.

When running the car appears to be giving off a blueish smoke, indicative of it burning oil; upon revving producing black smoke, indicative of running rich. See video of exhaust

Today

To spare all of you a wall of text I'll condense what I've done thus far since the above. Many of the injector connectors were replaced with push-to-release connectors but not all, additionally the previous work involved a really shoddy soldering job. I've since replaced all injector connectors, as well as the AAR. I also chose to solder but this was done using a lasso method. Even if the others weren't problematic, knowing how bad they were I wouldn't be able to let it go. Only connector not yet replaced is the Cold Start Injector. Approximately 80% of the vacuum lines have been replaced in addition to all fuel hoes from the feed to the return hard lines with the exception of the injector hoses. I've lashed valves to ensure they're within spec according to the FSM, ensured all grounds (7 of them) in the engine bay are nice and clean, and replaced all 6 spark plugs.

Once the above was done I took a vacuum reading while the motor was running and seem to be getting a fluctuating reading between 11-15 in Hg. From my research it should be closer to 18-20 in Hg I believe so this indicative of something still being off. Additionally checked plugs, all are fouled (unsurprising due to rich/oil conditions). Recently got a borescope so I've also scoped all cylinders. #5 is the one I've suspected the most thus far based on the plugs. Upon scoping there's a small puddle of oil within the dish of the piston. #6 also appears to have some level of oil on the piston, but not near as much. Otherwise all the cylinders per my eyes look to be in healthy shape. See scope results, and video of vacuum reading here.

At this point I'm a little unsure where to focus my energy. Compression test was good but that doesn't paint a complete picture. Considering attempting to do a leak down test and potentially replace valve stem seals. Although that won't do much for helping to fix the richness issue which I believe to be the bigger priority. Will try to periodically update this.

Edited 3 hours ago3 hr by shadow1872
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