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What's your method for repairs?

I've got the potentiometer or rheostat that Patcon talks about on my coolant temp sensor. I think you could add enough fuel through that to make the efi run with a mild cam. Somebody needs to try it. I'm just too busy. I do know I can flood mine down to stalling, barely run with it.

And I must apologize. Your car is different, duh, from what I'm used to seeing. Caught me off guard. Anyway 6 of 1, half a dozen of the other. It will be fun learning the differences in our cars. Old dog here but I enjoy new info.

There's no fuel filter. The pcv hoses look messed up to me. There's a lot of stuff not terminated it looks like? What's up with the injectors. Looks like a fuel line to each one. Fairlady 2.0 is very different than my Datsun 2.8.

Best bang for the buck and not worry about sniffer test is an aluminum flywheel. You can buy one or have the OE lightened as much as possible. I got lucky and bought a 240 project with an 11 pound Tifton or Tilton?? but Findaza still makes them I think. My car revs like a motorcycle. With the header and performance exhaust it sounds like a Ferrari screaming bloody murder.

My egr tube came loose and after years the exhaust gasses rotted a hole in my intake manifold about the size of a golf ball. Chased that problem until I put a handheld mirror under there and saw the huge vacuum leak. Replaced the intake and deleted the egr which is way more than just pullung that stuff off. There's some vacuum lines and thermal vacuum switches you have to deal with too. I'm with Zed Head on the reverse tuning you're going to have to do but you're here where everybody likes to solve issues. The forum has been needing a good puzzle too. You are a pleasant and thankful guy so it'll get back to running soon. We like pictures that show what you're talking about so the more the better even though the car's in one place and you travel. Do a photo dump when you're back with the car. Zed Head will figure it out.

This is a good place for those mental roadblocks. These guys sure have helped me.

Oh yeah. You said the fuel tank was bypassed when you bought the car. What's the reason if you know? The metal fuel filer up front could be horribly clogged starving it for fuel at higher rpm. Pressurize the system and try pinching the fuel line coming out the top of the filter. It should be really hard to pinch. If it's soft and squishy the filtet is probably clogged.

Will they run without the TPS? I can't remember reading anyone bypassing the switch, too lazy to go downstairs and try. Maybe this weekend...

There's a chance you have mismatched parts. The oil pickup could be wrong. The oil dipstick too which would show full when it could be low. 240, 280s and ZXs all are different. The high pressure bypass under the oil filter could have a weak spring. Teflon tape on the oil sender threads could be blocking the hole into the sender. That's a few things I've read on here over the years. If the top of the head is soaked with oil I wouldn't worry to much.

My '77 had that pink bondo looking stuff too and I'm almost positive the pump was OE. I think those plastic things are like some kind of "locker" type device to keep the terminals secure. Just a guess though. I'm doing a link to something really helpful to the 280 owners if you haven't seen it. https://www.atlanticz.ca/zclub/techtips/EFI&fuel.htm

They left off the "w". You should adjust whole plug not just half of it.

My girl baked me a cake one time. I had to buy antibiotics afterwards.

That hole in the drums lets you turn the adjustment wheel on a 240. Not 100% sure if the 280s have that adjustment? but if you can't get the hole lined up to the toothed wheel then it's no good. Hit the drums with a rubber hammer or small sledge if you have replacements. My country arse would try dragging it with my lawnmower to unstick them, been there done that.

You'll see it kinda boucing around the cam lobes when the caps off. It's not going to shoot out like crazy if the car's idling.

Isn't Mothers Day soon?

That's a compression gauge isn't it? You can get an 1/8 npt at Lowe's in the swimming pool section. My local store has one up to 60 psi but that's high enough. The oe dash cluster gauge only goes to 90. With a high volume turbo pump on my pretty fresh 2.4 it pegs the high side while driving. Idles at half gauge. https://www.lowes.com/pd/Aqua-EZ-Pressure-Gauge/3151541

After reading more it sounds like you're onto something electrical related? I was just thinking of some easy things to check first. Here's the AAR plug-in and one of the best helps I've gotten for my '77 280. Good reading with lots of photos. Hope you get it figured out soon. http://atlanticz.ca/zclub/techtips/aar/index.html http://atlanticz.ca/zclub/techtips/EFI&fuel.htm http://atlanticz.ca/zclub/techtips/

Your cold start valve vould be flooding it with fuel after it warms up. You can unplug it to see. You can also unplug the auxiliary air regulator. Another cold start device. Easy things to check off your list of possible problems.

Suddenly my nose itches???

@jalexquijano there's information in here that may help your 240's vapor lock problem you've struggled with. The added length of hose is a fantastic idea I think. Whether it works is your's. Do not assume it's a fix for YOUR car. Just a hopeful solution or at least helpful to your car. You're reading the same thing we all are so what to do with the information is totally on YOU. Edit. I know you have round tops and a 72 year model so please save your time telling that. Read between the lines and hopefully you'll find something useful.

Could you soak the harness? mineral spirits maybe? It'll soften up rubber.

You did this to be around such a collection I'm guessing? Maybe one day you might purchase one?

Reference I guess. I do not have one on my 240 but the 280 does. It was cheapest at Jegs when I bought that one, free shipping also if I remember correctly. I like the one I have. It had flex and made noise at high speed but I figured out how to reinforce the backside with the OE lip and it worked out great. 280 now, no history with a 240 air dam.