76 280z starts but dies after 30 seconds

[Baki 280z]

!!HELP!! It runs for 30 secons and dies !!! HELP !!!!

could anybody answer this one ,,, engine starts and it runs for about 20 - 30 seconds and than dies slowly ,,, I got new spark plugs ,cables ,air filter ,fuel pump ,fuel filter, new gas in tank ,,,, if i hold engine on 3000 RPM its working fine and than dies, any suggestions !!!!

i ordered fuel pressure regulator I been told it might be that ,,,any suggestion ?

Edited March 24, 2010 by Baki 280z

[sblake01]

Did you recently purchase it?

[Baki 280z]

yes I got it week ago ! worked on it since , replaced spark plugs ,wiring , new gas ,vacuum hoses checked ,

[Oregon260z]

Not sure if this car has one but I had a 1st gen celica supra that did this and it was the MAF sensor was bad. But like I said Iam not sure that the 280z had that.

[sblake01]

No MAF sensor in a 280z. Check your fuel pressure. If the car has sat for a long period of time there will be sediment in the fuel system which prevents the system from achieving/maintining the proper pressure to run correctly.

[Oregon260z]

like I said I wasent sure but now I know : )

[sblake01]

This might come in handy if you don't already have or have access to a Factory Service Manual:

http://www.xenons30.com/files/FSM/76_datsun_280z.zip

[sblake01]

like I said I wasent sure but now I know : )

No problem. 1st gen Supras were just a little more advanced than 280Zs.

[Baki 280z]

I also go a new fuel pump installed , I'll try pressure regulator first if that not working I'll install new fuel lines ,, got to have it running

[AnthonyG]

could be vacuum issues.

also, did you check that the oil dipstick is seated and seals good?

when the engine is running does the brake booster work? If you depress the pedal does it make the car die faster?

[zKars]

When it dies, does it just die instantly like you turned off the key, or does it slowly die over a matter of 10-20 seconds? Case 1 is more electrical suggesting, case 2 is more fuel related. You mentioned slowly, just how slowly? I'de be putting a fuel pressure gauge on there (after fuel filter in engine bay, before fuel rail) and watching what happens at that magic moment before I go spending any more money on parts....

Jim

Edited March 24, 2010 by zKars

[Baki 280z]

yeah it takes about 5-10 seconds to die slowly , what do you thin could it be fuel pressure regulator? because while is dieing its fighting to stay on ,more i keep doing it , it takes longer time to die when its gets worm