It runs on all 6 sometimes

[Cethern]

A while back I bought a 76 280 for 300$ The kid that had it could not get it to run at the time I founf the boot Between the AFM and TB was Cracked so I taped it up all nice and pretty...I got it home and got it to stop smoking. Changed the oil and filters, Plugs. And checked for vacuume leaks over all it has vacuume and commpresson at 140lbs +/- 2lbs in all holes. The past owner did put in new injectors.

But it misses and loads up then at times it will run fine other times it wants to cut out and die.

Now other than a exhaust leak at #6 and where the manifold meets the pipe I can not see nothing out of wack.

The TBS looks to be within spec and the thermotime other conections look to be clean and tight.

Right now I'm guessing I will have to go through the EFI Bible and the repair manual.

Any Ideas?

Thank's

Eric

[JimmyZ]

I imagine you tried new plugs and wires? Checked the ditributor caps for cracks etc?? Try using a timing light on it when it's missing. Use the inductive pickup on each spark plug wire to figure out if it's an ignition prob or fuel. A misfiring plug will not create a flash from the timing light. This is also a fast way to isolate a fouled plug on an oil burning engine.

Fuel or ignition probs can sound alike. Ignition is easy to figure out but fuel on a 280 needs a bit more thought.

2c

Jim

[76Datsun280z]

It would be best to just replace the boots for the AFM to just elminate that problem 100%, but a couple things to look into first would be your fuel pressure regulator and making sure your injectors are getting a good connection and are all firing.

[Cethern]

This Morning I left work and went a few miles to get a new head gasket for my other problem child and the car ran great. But when I went to go home it ran like crap again. Really rich, So when I got up I changed out the thermo sensor.

I think I will change the injectors with some OEM ones I have. Right now my thoughts are I have one or two injectors are stuck open...maybe? Even though they are new well two or three years old sitting. there could be holding one open?

I will before that check them and make sure they are getting power. I plan on changing the plugs again tonight the last set where black so I bet this set is pretty much the same.