Thread: 1977 Datsun 280Z

Not yet...... On the list.
It was replaced not too long ago I'm thinking.
What should I be looking in the air flow meter.

Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z

Here is Greg Gordon's excellent L-jet trouble shooting/tune up guide.

L-jetronic Fuel Injection Technical Troubleshooting Article

Good luck.

Originally Posted by Braz

Here is Greg Gordon's excellent L-jet trouble shooting/tune up guide.

L-jetronic Fuel Injection Technical Troubleshooting Article

Good luck.

Perfect. It is a long list but your fix is in there.

Oh man that brings memories!!

Not that this will help in any way whatsoever, but I just got to tell you. My brother had a "Z" back in the day. The thing never quite ran right, but it never broke down either. Eventually, my brother got bored with the car, but couldn't justify getting a new car until the Z died. In his mind, there was no rational in selling it (he's always been a weirdo).

So with that in mind, one weekend, we decided we were going to break the thing once and for all so he could get himself a Beamer.

Without getting into details, I'll just say that both of us were stunned when we discovered it could actually make traction in a corn field! Ultimately, it did die however in the middle of one, but man was that good times!!

Of course, what I wouldn't give to have one in working order now lol.

Hope you get yours running smoothly!

We replaced the plug wires and fuel filters. Still runs super rich and black smoke. We haven't looked at it in a few days. When we wiggled the injector wires, the idle changed. I'm thinking maybe the wires are not sending a good strong connection? Maybe get a new set of injectors wires. The ones on it now are fairly old....the clips don't really hold the plugs to the injectors like they should. I have a buddy who used to work at the Nissan dealership..... I knows a few tricks and will give some helpful pointers when he comes over sometime when he is free after work.

Thanks again for all the helpful advice from everyone here thus far. I do hope we can this car running soon.

Today I tightened a few hose connections, checked the injector connections. Cleaned the connections. Car still ran rough then totally shut down. Like it was starved for fuel. Tried to restart it numerous times..... Nothing. Would not turn over. A few drops of fuel leaked out of fuel pressure regulator. I am beginning to dislike this car and the fuel injection issues it has. I know I need to replace the fuel injector connectors..... They are old and not fitting properly...... Fuel regulator too...... That isn't cheap. (SIGH)

http://atlanticz.ca/zclub/techtips/e...ectionbook.pdf

A great read on how the Datsun 280z's fuel system works, and what/how to troubleshoot the various parts.
Don't give up man. An inline fuel pressure gauge could be a big help for you right now and they are dead easy to build from bits at cdn tire or your local Napa.
Keep us posted. Your 77 ride makes my 90 seem new.

Still running rich. Running rich usually means there are no vacuum leaks. Propane bottle and hose will find most all leaks. Motor speeds when you find one. Running rich you need to check a spark plug now and then to make sure your not fouling them out.

Black smoke is fuel.
Blue -ish is oil.

Try unplugging the electrical connector to the 'cold start valve'. It could be still dumping fuel after warm up.

Over fueling should be easy to track. You will need pressure gauge suitable for fuel injection systems for they are rather high pressured. 60 and up to 120 psi ranges. They usually lose pressure before they gain so now I'm thinking more air sensors and CPU that manage it.

I wish I could remember more detail. There was a way to move the air flapper door and tricking the CPU and manually leaning it out or richen it up.

Check the fuel pressure regulator. Yank the vacuum hose off and see if there is gas in it?
Long needle-nosed pliers. Pinch every vacuum line while it's running. See if it clears up on any?
These old cars with the vacuum switches and solenoids can suck gas from any number of places.
Take the airflow meter off and be certain a mouse has not built it fully open. Check the airbox/filter as well (saw that once!). Just check to see if it is working mechanically. Should open with a push and snap gently-closed as-releasing.