7 minutes ago, siteunseen said:

How long since a new fuel filter up front on the passenger's side? Sounds awful familiar of a clogged up tank. You can run a hose before the pump to a gas can to bypass the tank as an easy test

i added a new fuel filter a few days ago. I ran the old fuel out with the pump and added about 5 new gallons, ran that through until it cleared out. it should be good enough to keep it running. Im leaning towards now the cold start sensor and the thermal switches. still trying to understand all these system. these sensors are ~50 years old, im sure they arent working perfectly.

I think im to the point i know the engine is good. i want to tear this entire engine bay apart, clean, replace and start from fresh.

21 minutes ago, Toiletduck34 said:

cold start sensor

There is no cold start sensor.

You're at a good point to read the Engine Fuel chapter.

sorry im refeering to the cold start valve.

I thought i wasnt getting enough fuel after the initial start and checked the fuel pump and its sending fuel, the filter is staying full. there has to be something that stops sending a signal of some sort after the start procedure because I ran a test.

Test: started the car and let it run for 8-9 seconds. the moment i hear it start to fail i click over the egnition for just a moment. the starter grinds for a milisecond... BUT the engine continues to run. I did this 4-5 times to let it run for ~1 minute and it idle perfectly.

****maybe im only getting gasoline from the cold start valve... when it stops im not getting anything from the 6 injectors.****

Edited 3 hours ago3 hr by Toiletduck34

@Toiletduck34 Where did you find this reference material?

Edited 3 hours ago3 hr by Yarb

2 minutes ago, Yarb said:

@Toiletduck34 Where did you find this reference material?

1980 EFI Bible.pdf

8 minutes ago, Toiletduck34 said:

Test: started the car and let it run for 8-9 seconds. the moment i hear it start to fail i click over the egnition for just a moment. the starter grinds for a milisecond... BUT the engine continues to run. I did this 4-5 times to let it run for ~1 minute and it idle perfectly.

Are you saying that it still will not continue to run? That you have to do this trick over and over? That would make sense. Each "Start" squirts some fuel in to the intake manifold. The cold start system would be working corectly. Not a problem.

Still sounds like your injectors are not opening. Pin 1.

Besides cgsheen1's suggestion, tapping on the injector bodies will often break them free. In your case though it might take a while to get all six free. The engine will run on three cylinders. Sounds like you don't have any injectors working.

I'm reading through some stuff and looking at information the AI and it brough up the thermotime switch. it functions at start up for exactly the amount of time my engine stays working.

The most reliable source is the FSM that can be downloaded on this site

Yarb, the 1980 EFI book is the official Nissan electrical troubleshooting manual. It's basically the FSMs stripped down to the bare essentials and combined in to easy to use charts and instructions.

I understand that, AI is a smorgasbord of articles massaged into one. He mentioned he was searching AI. The reason why I asked the question.