Zed Head

Having the purge hose connected all the time creates a vacuum leak at idle where it will have more impact. The system is designed to give precise mixtture control at idle speed. If you connect directly to the tank you'll have a vacuum leak through the gas cap. It's vented so that the tank is never under vacuum. It would be an odd vacuum leak though since it will be pulling gas fumes in with the ait. Hard to say if it would cause a rich mixture or a lean mixture. This is page 7 and I don't know if you still have the original charcoal canister or a new one. The material in the canister does get clogged over time and can also solidify and crack I would guess, leaving open passages back to the tank instead of filtering/capturing the fumes. Might be that you just need a new(er) canister. They all work the same so you could just grab a complete canister with control valve on top from a newer car. That's what I would do. I looked around for a new TB controlled system on Rockauto but didn't find one. But there's probably one out there somewhere. You could also get a new canister for a solenoid controlled system then use a vacuum control valve to control the flow. Edited for a better option. Ports clearly ID'ed. Tank, purge, air. https://www.rockauto.com/en/catalog/chevrolet,2002,corvette,5.7l+v8,1380024,exhaust+&+emission,vapor+canister,5180 https://www.rockauto.com/en/moreinfo.php?pk=940007&cc=1380024&pt=5180&jsn=10999 https://www.rockauto.com/en/moreinfo.php?pk=814069&cc=1120903&pt=4980&jsn=1979&optionchoice=0-0-1-1

I can't find a good thread about reflowing the solder joints, even though I said there were threads on the forum about it. If you have a good eye and/or a magnifying glass you might be bale to see the cracked joints. Apparently they are on the line of 35 pins where the connector connects. This thread has a lot of good info and pictures, in general. The line of solder spots on the right -

Vapors are pushed in to the charcoal canister from the tank. Like when you fill it with cold fuel and the fuel warms up in the sun. The vacuum hose from the intake manifold pulls air through the charcoal canister, pulling the fuel vapors from the charcoal as the air passes by. The bottom of the canister is open, so there's no way for the intake system vacuum to pull on the hose back to the tank. The Nissan engineers created a pretty good pictorial description, although they shouldnt have said "at rest" since they show the vapors flowing to the manifold. That only happens when running.

Your symptoms match how the ECU's fail. You might try banging on it. Many people have used that as a diagnostic method, there are stories on this forum about it. Apparently the solder joints crack at the main connection and banging on it brings them back to life. It it works it's a clue. Fist or foot, it's worth a shot.

Check the fuel pressure regulator vacuum hose for raw gas. Maybe the diaphragm ruptured and the engine is sucking in excess fuel. Running super rich.

Does it have the new cover on it yet?

What about the pin for pin 30 on the relay? Might just be a bad connection at the battery supply. https://www.thezstore.com/product/3861/headlight-relay-upgrade-harness-70-73-240z

No offense but I'm going to guess that you don't feel comfortable doing electrical system diagnosis. There really should be several voltage measurement reports here. At the headlight switch (input and exit), at the fuses (left and right), at the headlight sockets, etc. And at the relay socket pins before you replaced the relays. That's the way to do it, you shouldn't pull or replace anyhting until you've taken a measurement or probed with a test light. You've pulled fuses and replaced parts but haven't reported any actual measurements. I'd start at the headlight fuses. They're easy to get to and you can go forward or backward from there. Measure from each side of the fuse to ground with the headlight switch on.

240Z's didn't come with headlight relays. More to your Z than it came with from the factory? Sorry to muddy up your thread. I got spoiled on my 280Z. You could follow the diagram easily. From power source to ground. I can't get a grasp on those 240Z diagrams.

Here's the clearer version from cgsheen's source. And a link to the Supplement he mentioned, where the graphic below came from. I had it, just picked the wrong source from my computer. It's here on CZCC also. Edit - actually I see that the Supplement has the empty block under position 2. Looks like a typo. But the two images together should be useful. Good luck. Edit 2 - never mind I see how the empty block works. Still confusing to me though. RB and RW head through the Dimmer circuit and back through the Combo switch, if B is black for ground. It looks like the Combo switch is after the Dimmer circuit to complete the ground. Different. Anyway, I have no incentive to solve the puzzle. Double good luck! https://www.classiczcars.com/files/category/11-240z/

Just for fun, here's what I was looking at. and

Not sure what you mean by "mating connector" or how you are checking for voltage. I was going to suggest checking the wiring diagram but it's pretty confusing. Nissan did some weird wiring stuff before they got to the 280Z. But if you do decide to take a look it's on the last few pages of the Owners Manual. There are some odd freestanding diagrams out on the internet that have missing links, like open blocks on the headlight circuit. The Owners Manual seems to have a complete diagram. Page 37. https://www.classiczcars.com/files/category/17-owner-manuals/

San Jose is a ways away from Bend.

How did it behave when you jacked it up to put it on the stands? Was it flimsy or solid? The rockers, I believe, are the major longitudinal body stiffeners. You know more, of course, but overall stiffness tells a lot about potential. Was that a muffler hanger holding the "roll bars"? And a piece of strap steel for the seat belt? What does "inspection" entail in your area? How much needs to be done to pass? Just curious. It might be possible to get it past inspection but avoiding involvement with a future disaster is reason enough to say no.

Well then, no offense intended, sometimes we overlook the obvious, the simple thing to do would be to compare the parts on the front of both engines. Get out the ruler or tape measure. Or, any chance you got the engine mount brackets on the wrong sides? People do it sometimes but I don't know if it moves the engine forward. It does cause it to tilt the wrong way.

Who wants to message the guy about leaving a deposit?

Did the 240Z have anything in it when you bought it? Looked at your old posts and can't find any details. Could be an engine swap, could be a salvage car that didn't have anything. Details about the L28 might help too.

Where are you seeing two options for 1977? The writeup that you pulled from is specific to 1977. His other comments are his best guesses for other years. I'd follow his first set of instructions. https://atlanticz.ca/zclub/techtips/alternatorswap/index.html The table that you pasted might be from zcarcreations if I remember right (not positive). That scheme will give you problems with your brake light. Follow the atlanticZ instructions and you should be fine. For 1977. p.s. when you copy from other web sites it helps a lot to post the link. Good luck.

I thought that CL had a way to report scams but I guess not. So, what exactly is the scam? Not clear how the scammers make money from fake ads. I do remember the old "selling but not in town" scam where they asked you to wire money. But this one looks local. What's the latest scam technique?

This page might help on the speedo gear. https://www.thezstore.com/category/1005/speedometer-pinion-parts

That's a bummer. Here's a Hybridz thread that might be helpful. Note also the part about the ring gear size. Two different sizes for R180's. Better check. https://forums.hybridz.org/topic/49194-differential-cv-lsd-hp-torque-r160-r180-r200-r230-diff-mount/

Seems possible if you can work in that tight space. It might even be easier to get the pin aligned and the circlip on. Worth a shot. Worst case you just do what you were trying to avoid. Wish I had thought of that. I hated removing my console, Nissan made the wires so short it was really a pain to work with them.

McMaster-Carr has BSPT fittings. https://www.mcmaster.com/products/pipe-fittings/thread-type~bspt/low-pressure-galvanized-iron-and-steel-threaded-pipe-fittings/

Doing is knowing. Use Vise-Grips on the spring. My clevis pin had a round head also. Push it out with a screwdriver.

Remove the return spring from the pedal and it might be easier to get things in a position to come apart. It will also take any pulling force off of the rod. Also, you can loosen the locknut on the clevis and turn the rod with a pair of pliers to unscrew it completely from the clevis. Ths will leave the clevis hanging free on the pedal. Turning the rod while everything is together is the way to adjust it after installing too. Adjust it without the return spring until it is correct, lock it down, then put the return spring on last.