Starts right up, then falls on its face.

[z_ya]

Pretty much what happens is I will turn the key and it will start right up then if i don't give it gas it will just die after maybe a second. I can keep it running but i have to hit the gas pedal a few times then it will be fine running on it's own. It's like I have to "prime" it while it's running to keep it running. The car is a 1978 280Z all stock it's my daily driver and something I've come used to but when you go to start your car and the ladies are around and it dies it doesn't look to cool anymore. :disappoin It does not happen however after its been ran for awhile it seems to only do it after sitting for maybe an hour or more. Any info is appreciated guys, thanks in advance.

Nathan

[siteunseen]

Sounds like it's losing fuel pressure. Could be leaky fuel injector tips or the fuel pressure regulator is going bad. You need a gauge on a fuel line to tell.

[SteveJ]

Go to xenons30.com/reference and find the fuel injection bible and FSM for your car. I'm not an expert on 280Z fuel injection, but I would start by looking at the cold start injector. The FSM and fuel injection bible will give you the proper diagnostics to determine whether or not your cold starting system is working properly.

[JLPurcell]

Sounds like you might have a cold start sensor problem. I am not familiar with the 280 injection system but it sounds like you are not getting fuel enrichment on cold start. This is usually caused by a problem with a sensor or if present a problem with the enrichment injector. My experience is with VW and MB injection systems.

JLP

[z_ya]

I have a new fuel pressure regulator on the car, I'm fairly confident that I have enough fuel pressure as it runs fine after the first initial start up. As for a cold start I don't know. I'm not gonna say no but I'm not gonna rule it out. But pretty much let me try and describe this better. I turn the key and it will start right up no problem but after the start it falls and dies. So starting is not a problem. I might not be describing this properly and i apologize for that.

[Zed Head]

Could be the auxiliary air regulator (AAR), It might be stuck closed. It's designed to let more air in for a few minutes so that you don't have to hold the throttle down or blip it. It's the torpedo shaped thing by the throttle body with a large hose connected to each end.

[Captain Obvious]

My first thought was AAR as well. I'm thinking that maybe it's gunked with sticky PCV system blowby and it still works, but it sticks in place. Theory being that the AAR is supposed to creep open as the engine cools off and by the time you start the cold engine next day, it has creeped open enough to cause a high "cold" idle.

If the AAR is sticky, maybe it's not opening like it should, but the vibration and shock of starting the motor is enough to get it to move to the correct position? Then after the second start attempt, it will be OK.

So the question would be... Once you have feathered the gas pedal for a few seconds, does the idle continue to struggle, or is it a nice smooth high idle like it's supposed to be?

My second thought would be that you are always borderline lean and when the engine is stone cold it just can't handle it.

[z_ya]

I'll take a video of it and post it on here cause I don't think I'm explaining this well enough and I'm really sorry about that guys.

[z_ya]

the second start up when rpm drops is me letting out the clutch.

[SteveJ]

the second start up when rpm drops is me letting out the clutch.

You might not want to make the video private. By the way, have you bothered to look through the troubleshooting in the FSM?

[z_ya]

I ran through the fsm yes and shoot I did'nt realize it was let me see if I can fix it.

[z_ya]

okay it has been switched to public. Sorry it's all from my phone.