Zed Head

as @Zed Head said, pull the spayed ign. Off the terminal and measure the voltage. Black to Gand and red on the spade turn the key to start. I think that he's just answering Yarb's question directly. Seems like you're getting voltage/current to the starter solenoid. Leave the wire off of the spade terminal on the starter and use a jumper wire or a tool like a screwdriver to connect the main battery connection to the spade on the solenoid. You can also run a longer wire directly from the battery positive for convenience. The starter should actuate. If it doesn't then the solenoid contact has probably crapped out. There will be some small sparks and the starter will work correctly otherwise. Make sure the car is in neutral and nobody has their fingers or other things by the fan belt. If you hear a solid click from the solenoid but the starter motor does not spin that's a sign that the starter motor has failed. Yout starter looks pretty crusty. If you try this jumper wire method and everything works then you have a problem with the wire from the ignition switch.

Wow. Was it running like that or was during installation? How's the crankshaft surface? I think that new is avaialble. Z Car Depot IncSearch: 11 results found for "damper"New, used, and OEM repair and replacement parts for Datsun 240Z, 260Z, 280Z, 280ZX, and 510.

I was talking about a different problem. You'll know it if it happens. On the loose pins, if it was mine I might put a slight twist on every male pin in the ECU. Increasing effective width. I'd have to check the contact points to be sure it would work though. On to the next problem. Might as well get ready for the failing ignition module. It's a high probability.

For the record, I just read that zcar.com thread and see that I might have actually borrowed the transistor replacement idea from ZXPastor. Not sure. I got the replacement transistors at a Fry's Electronics store before they shut down. Cracked solder joints aren't uncommon on the old Datsun electricals. The headlight and running light connections, on the top of the steering column, crack and break also. You might add some relays before those fail. Full lighting circuit current runs through them. They get hot. Will be following to see how things work out. You'll have three ECUs to swap in and out for testing and comparison. Good times.

Don't overlook that when you have the connector disconnected from the board that the solder joints are probably less-stressed. I didn't see the common cracked solder joint problem mentioned in the thread. For some reason the internet is not picking up the old threads when I search. I only came across one. I've seen the others though.

It might be fun to run with the ECU cover off. When you kick the case all of the components feel it. With the cover off you can pick the one you want to test. Hit it with a hammer, wiggle it, whatever. It is odd though that two ECU's would have identical failure characteristics. Might be worth the tme to do a pin drag test on the active pins in the connector that CO shows in his diagram. Maybe you have a loose one.

What ignition system are you using? The ECU uses the coil voltage pulse to trigger injection. Maybe the problem is actually in the ignition module. The coincidence with the tapping on the ECU might be imaginary. No offense, the human brain can rationalize itself in to knots. I had thought of this earlier - if the problem is repeatable and you can make it happen while you're in gear and moving, the tachometer should still show RPM if it's the ECU crapping out. If it's spark related the tach will drop like a rock.

Ball joint failure is a real thing. It usually causes major damage and loss of control. So the calculation is about how close a person wants to get to that catastrophe. Which also endangers other people on the road. But in this case, Nissan has given an inspection procedure. If it meets spec. why replace? What's odd is that they say that the ball joint cannot be disassembled, when, obviously, it can be.

Sometimes I take a best guess, no matter what the depth of my knowledge on a subject, and just try something. Then hope my brain will take the results and come up with something better. In retrospect, I doubt that the transistor(s) was/were the cause of the problem. I imagine that almost any open circuit or short inside the ECU could cause it to malfunction. Your situation is unusual in that it seems so repeatable that it's almost controllable and is the same for two different ECU's. Maybe you're just losing a connection at one of the pins. Probably one of the multi-vibrator functions! 🥴

Looks like the NA 280ZX engine might be 79 or 80. Can't see the cylinder head temperature sensor. But that's USA only, seller might be in Canada or Europe or Australia. N42 block, N47 head, probably. They all look complete. Even the fan belts and motor mounts are still attached. Shipping could be expensive.

Whatever you're writing in your messages must be something he's avoiding. You seem reasonable and rational on this forum. Any reason he would be avoiding you? Not a good look for him if there's no good reason. Maybe your messages aren't getting through. Never know. This should bring him directly to this thread. Good luck. @Sean Dezart

If I was trying to sell them I'd supply mileage when removed, how well they ran, and the price. I assume that maybe you're just looking for offers? Good luck.

Aside from replacing a part that meets Nissan specs, another factor to consider might be that used Nissan is probably better than new aftermarket.

How much? Did you see them run or are you passing on information?

Sample size cannot get any smaller. I doubt that that's why they come out since the the space between the rocker arm and the valve/pad assembly would have to open up enough to allow the lash pad to pop out. No logical reason for the divot to stop that from happening. Besides the fact that many people have had that happen when they restart old factory stock engines that have been sitting for a while. Most people think it's caused by sticking valves. Maybe your guy sets his guide clearances too tight. But, he's the builder. Good luck.

I saw him posting some comments on BaT. Probably breaking a BaT rule but you could comment in one of the auctions that he comments in, with an @. Scroll down and you'll see his comments. https://bringatrailer.com/member/seandezart/

Also should note that it's called several different things around the internet. Valve guide, Guide - Rocker Valve, lash pad. Might help for searching. The part number works well though.

Here's some stuff. Not sure if they're showing the -Y7000 pads (Replaced By:) or the original part number. https://www.carpartsmanual.com/datsun/Z-1969-1978/engine-280z/camshaft-valve-mechanism/25 https://www.nissanpartsdeal.com/parts/nissan-valve-guide~13218-a3501.html

Like these? What kind of problems has your machinist had with the flat bottomed pads? Not sure that the dimpled ones are actually "stock type" for an L28. Don't know. https://jdm-car-parts.com/products/kameari-performance-valve-lash-pads-for-nissan-l-engine https://datnissparts.com/stock-thickness-120-lash-pads-datsun-nissan-l4-l6-l16-l18-l20a-l20b-l24-l26-l28-13218-y7000/

Not bad for 1976 280Z survivor. Still has the splash shield and exhaust pipe heat shields. https://bringatrailer.com/listing/1976-datsun-280z-106/

So many new things pop up on the internet now it's a surprise they haven't interviewed his coworkers who saw it happen. I just read a different article yesterday about him where he said he thought he should have switched to being a normal right-handed player. He started playing leftie, like Jimi Hendrix, and didn't think he could relearn everything so he just improvised with those prosthetic finger tips. I worked with a guy years ago, after his own accident, who did similar but cut off about half of all four. Said he didn't feel a thing, they were just gone. Metal shears are dangerous.

Might as well do the whole album. Had it on cassette (high tech for cars!) back in high school. Did not help my studies...

No reserve 10/70 1971 240Z project in Texas. https://bringatrailer.com/listing/1972-datsun-240z-359/

Well, this is a bummer for the day. https://apnews.com/article/ozzy-osbourne-dies-adff88b55f1d3b0bace5705d58d3cdde