Zed Head

Is your tachometer connected, with the inline resistor in place? I had found in the past that my 76 and a 78 parts car would not start if the tachometer was disconnected. It appears to do something to the signal on Pin 1. I never figured out what, but I did confirm it a couple of times. On the 78 I had the tachometer out and on the 76 I had the resistor removed which disconnected the tachometer.

Seems like the main question is "what happened between then and now?" The cracked AFM hose could stop the AFM from functioning, but the engine should stil start for a few seconds on cold start injector fuel. Maybe your spark is too weak. Are you seeing s strong blue spark or a weak yellow spark? You might try starting fluid to see if you can get it to fire for a few seconds. Another possibility is flooded/fouled plugs. Have you pulled a spark plug to see how it looks? I'd do that, it's easy and quick.

Pretty slow lately. Maybe some chest pain will help.

I was being clever to draw out the bot. I actually meant is this a new bot method. I reported one of the posts. Lets see what happens.

Is this a new method?

The app does the calculation for you. "Degrees crankshaft". https://123ignition.com/wp-content/uploads/2023/03/Curve-Tabel.jpg

He's done a Z before but it was missed. Funny though, I referenced it later for another reason. https://bringatrailer.com/listing/1972-datsun-240z-354/ Feb 20, 2025 comment in case it doesn't come up. https://www.classiczcars.com/forums/topic/69026-1970-wiring-diagram/page/5/#comment-674728

Just realized that's a Dennis Collins car. The guy that showed up on Fast n' Loud occasionally with lots of money. Has a Youtube channel now, like everybody. He seems to know his values. He got it in trade for a Shelby Mustang apparently. Described in the BaT video. Looks like he's expecting over $143,000 if you read between the lines of his presentation. https://www.youtube.com/@DennisCollinsCarWorld/videos?view=0&sort=dd&shelf_id=1

On the 1.5 coil without ballast or just the setup? Or both?

1978 "Black Pearl" 280Z. One of the commenters says it sold for $90,000 at Mecum before. Don't know how to verify that. Maybe requires joining. Edit - found it on the Hagerty web site. Weird that they disclose but Mecum doesn't. Pretty big number for a 280Z. https://www.hagerty.com/valuation-tools/past-sales/1978-datsun-280z/HLS30465279/b657ee1a-bc07-4eb4-b5b9-1f3c21b7e972#_ https://bringatrailer.com/listing/1978-datsun-280z-191/

Hate to be contrary but they actually recommend a 1.0 ohm coil for a six cylinder engine. Somewhere out there I think that they suggest that their newer models use current-limiting technology like the ZX and GM HEI ignition modules, which allow the usage of the lower resistance coils and removal of the ballast. Can't find it but I remember seeing it. Lots of good stuff on this page - https://123ignition.com/support/ I kind of miss the good old days of plain instructions on paper or electronic paper. But everything's going to the glitzy internet style. Here's their manual with color illustrations. https://123ignition.com/support/tuneplus-app-manual/

Since you've checked for spark and have it the tachometer needle isn't necessary as a diagnostic tool. The ECU gets the coil negative trigger signal on Pin 1 at the ECU connector. You can turn the key on check for voltage at Pin 1 to verify that. The simple test for the injector control is test lights of some kind. NOID lights are the common one but you can use an LED test light also. Connect from pin to pin in the injector connector and try to start the engine. The light should flash.

The thinking machines have not been perfected... https://komonews.com/news/local/study-finds-chatgpt-answers-inaccurate-and-inconsistent-washington-state-university-says-ai-articicila-intelligence-work-automated-cheating-layoffs-openai-technology-tests-college-school-prompt-accuracy

Nice looking 260Z auction ending today. Small bumper version. Edit - sold for $9,300. https://bringatrailer.com/listing/1974-datsun-260z-125/