not running on all 6

[Pavmtpeelr]

I have a 78 280 that the front three cly. just quit.

I am quessing that it is a fuel prob. But is there any thing that controls just the front three injectors?

[76Datsun280z]

I know I'm saying this all the time, but check your injector connector to make sure it's getting a good connection. It may very well be that it's just not getting a connection and not firing.

[KDMatt]

I'm not sure if there's a component that controls 'just the front three' ... have you performed any tests yet to get a handle on where the problem's originated?

A good place to start is to check for spark... if there's no spark you can work your way back through the wires to the dizzy to assess the problem.

If spark isn't the problem then you could examine fuel...

The injectors all share a rail and pressure (to my knowledge) and basically fire simultaneously... so I suppose in theory if there wasn't enough pressure in the fuel rail, this would have a few injectors coming up short each time around, so it could be something like a bad regulator, or a clogged fuel filter, etc. etc.. things that rob you of pressure.

... before you go that far into it though... just take a peek at the electrical connections to the injectors. I once had a cylinder "quit" on me only because the connections to the injector on that cylinder had gotten all green and corroded. Simple fix, took me five minutes. -- I've actually had a small number of electrical goodies 'mysteriously' stop working because of this.

Worst-case-scenario is that something is stuck or broken in the actual cylinder head... but from what I'm told, this engine is a time-proven design that rarely actually fails or gives-out mechanically, so I doubt you're having a problem like that.

[beandip]

I am not a injector guy , but today I spent 6 hrs resurrecting a 280 from 12 years of non operation . One thing I do know . the fuel rail supplies pressure equal to all the injectors at the same time . The injectors fire in the proper sequence dictated by a source that is electrical. I would bet a dollar against a donut that the trouble is a connector or some connection that controls the cylinders in question. GaryROFL

[Pavmtpeelr]

Thank you for your fast replys.

I will check the electrical conections and make sure that the plugs are getting spark. I will repost my findings thanks again.