1977 280z 5sp
Didn't move since 1997.
Bought it for $400
Got it running yesterday.

Idles good, runs good up to around 2,500-3,000rpm (a quess, tach not working) then it starts to fluxuate up and down in RPMS with steady gas.
I am thinking dirty injectors or a bad fuel pulse regulator thingy?

Best way to clean your own injectors?

Where to get a pulse reg if i need one? Found one online for about $100, ouch..

Thanks for any help for this newbie!

 

This vac. line is totally mising on mine so i don't know where to route a new one, anybody tell me?

 

It sounds more like a AFM not fuel. But to be sure check the plugs. Change the cap rotor and wires. Take apart the air ducting from the airbox to the throttle body. Clean all that. When you get to the AFM play with the door to make sure it moves freeely and easily.

 

And what is that **** right next to the hood release?

 

The dip stick goes to a Auto-tranny. Are you looking for the location of the bg black vacum hose? or a different one.

 

Thanks for the help.
Its the vac line under the black "V" in the picture, not my motor, looks like it goes thru the fire wall.
On the RPM thing, already had new cap, rotor, oil/filter, and plugs so i will chech the butterfly valve as you said.

 

Its not a butterfly valve it is inside the AFM. Also have you changed both your fuel filters. Also make sure your fuel pump is working properly. It is located behind the passenger seat. If you lift the carpet up you will see the wires and the mounting bolts. The fuel filter is right under there. Welcome to the Z club. Mine is a 78Z. I have had her for 4 yaers. She is number 13 for me. And I plan on keeping this one.
If you have any questions at all just email me. You can get my email from my profile.
Shane

 

I dont have those hoses on my Z. They are either an automatic or smog thing.

 

Thanks!
Mines a 5sp also...
On the ****, i meant what is the black push/pull **** to the right of the hood release inside the cabin next to yhe drivers knee.
What does AFM stand for, air/fuel mixture?

 

The **** next to the hood release is for air to come into the cab by you feet. You have one on each side. The AFM is Air Flow Meter. It is located between the air cleaner and the throttle. There are 2 rubber tubes connected to it. One fron the air cleaner the other from to the throttle body.
Have you checked you timing. Also what is the temp where you are? If it is to cold you need to let the car warm up for about 2 minutes before reving it up. otherwise it stalls out or bounces at about 3-4k rpm

 

Noticed Distrib was loose when i put in the new cap and rotor, set it by ear until i score a timing light some where..

In St Pete Fla, been in the 60/70's this weekend.

 

Well the cold isn,t an issue. I would check the AFM and the fuel filter. It is located on the passenger fire wall and is about 3 inches in dia.

 

Yeah i did the little coffee can gas filter mounted on the engine room wall, is that the only one?

 

I asm not sure if yours has one by the tank. If not the make sure everything has a vacum line hooked to something. And besure your vacum advance hose it working.

 

Distrib vacume adv was not on, runs alot better now, still triing to find out what the 2 vacume nipples i have capped off in yellow here are: (have a haynes but no luck w/ it so far)

 

And this piece under the "V". is that a broken **** or is something missing and what is it called so i can get a new one?

 

My Z doesnt have the black canister lookingthing on it. The second one is capped off on mine. I would bet to say you can remove it. It is probably a smog thing.
The piece in the second picture has a vacuum hose that goes to a T and connects to the vacuum advance and back to the intake manifold. I think it helps with the high revs.

 

Thanks, ill hook it up
Is the Chiltons any better then the haynes?

 

haynes is the better way to go.

 

Ok after reading my entire Haynes (fun evening) the one vac line to the black diapham is the Fast Idle actuating device fitted in conjunction w/ AC, and i think the one at the rear is the "air distribution actuator for AC" in case anybody else needs to know.

 

who knows what can be ripped out and what is needed for proper ECU/engine running?

How about the fast idle for AC, the BCDD, the vacuum switching valve(tranny controled advance), the dash pot, and the BPT valve?
This guy (besides the fuel rail) seems to have lost most of it, think he still has the stock ECU?

 

Whos Z is that? I would like to find out what all I can remove from my baby also. Let weight is more speed. And that looks so much cleaner. Do a little creative color wrap.

 

I've been everywhere on the web looking for answers, don't remember where i got that shot. i've saved about 20+ engine pictures to see who has what hooked up.

 

Yeah i thought it was a little wierd for the guy to clean it up that much and not go the last few feet to color wraps and steelbraided hose.

 

By looking at it he has removed the chock and a lot of other vacumm hoses. I have printed the picture so I can compre it to my 78Z. I will remove what I can and let you know.