NismoPick

What's your outside temp there in Ontario? I can't imagine it's above 60*F or 15*C. Vapor lock would likely only happen on a hot 100*+ summer day. The injectors are obviously going to be hot to the touch... the exhaust mani is right underneath it.

scorpionp54

umm right now it cool low 60s, but this problem happens on a hot or cold day, night or day

Duck Ryder

I had this exact same problem, except mine would happen after just driving 7 city miles (~20mins). And to clarify, the vapor lock did not shut down the car while driving, it just would not start hot. The cause of the vapor lock was from leaky injectors. The fuel lines are pressurized (~30 psig), this raises the boiling point of the fuel. But, because the injectors leaked, the pressure dropped and the motor was hot enough to boil the fuel.

This problem was not identifiable until the injectors started leaking into the engine bay. Once I saw the leaking injectors, replaced them all and the car has ran normal ever since. She is now my daily driver

The car sat for years because of this problem.....

At this point, because of the noise heard from the injectors, I vote that the problem is with the injectors, some or one is leaking, this is allowing the pressure to drop and the fuel to boil when the car is turned off. Its not a large leak, otherwise you would be having other problems while driving.

It is a pain to get to the injectors, you've got to disconnect a pully just to get to the fuel rail, and the fuel rail wraps around the front of the engine.

Here is a troubleshooting guide for fuel pressure issues:

1. Hook up a fuel pressure gauge after the fuel filter
2. Warm up the engine then shut off.
If the pressure drops to 0 psig, then you have a leak somewhere and continue with the next steps
3. Warm up the engine again, or if warm, turn the ignition on (dont start), let the pump return pressure back to the system.
4. Clamp the fuel line before the fuel filter and after the fuel pressure regulator.
If pressure drops, then you have leaky injectors.
If pressure stays, continue with next steps
5. Remove fuel line clamps Repeat step 3.
6. Clamp fuel line before fuel filter.
If pressure drops, then you have a leaking fuel pressure regulator.
If pressure stays, continue with next step.
7. Repeat step 5
8. Clamp off return fuel line after pressure regulator.
If pressure drops, then you have a bad check valve on your fuel pump.
If none of this works, I am sorry

For me, the pressure drop was almost instant and it dropped to 0 psig.

scorpionp54

ok thanks, i'll see if i can find someone with a fuel pressure gauge and run the test. if this is the problem then i'll wiat to after im done with school and will be able to afford a new infector set. thanks for the help guys, i'll let you know when i get the test done.

KingDatsun1

I'm pretty sure I have the same problem. The car runs/idles fine, but I've noticed heavy ticking etc, as the motor revs the ticking increases.

I've NEVER noticed it in the 2 years I've had the car.

scorpionp54

what i did that seemed to really help was the seafoam in the gas tank. i put about 2/3 of it in the tank and the rest in the vacuum lines. i did this in two different tanks of gas with about 3/4 full.

User395

When I replaced my injectors, I unbolted the entire fuel rail except that one pulley bolt. It wasn't that bad, you just have to be careful to not bend the fuel rail when putting in the injector closest to the rad.

scorpionp54

i hope to get a new injector set soon, once im finished with school, and hopefully get my new muffler in a few weeks.

Magnaflow!!

Red-Z

Try a compression test to isolate a specific cylinder. It could be piston slap.

scorpionp54

i got my muffler order today, hopefully i'll get it installed next week i post pics and a video when i do

280zx2by2

might sound like this

http://www.youtube.com/watch?v=v7MHhDbh-9w

scorpionp54

ya ive been looking fora deep sounding exhaust, and i have a buddy who hooked me up with a muffler for cheep, and i'll rev mine up a little more so you could actully her it

scorpionp54

this is the one im getting

http://www.magnaflow.com/02product/s...e=main&id=8041

280zx2by2

i actually was reving it up to about 4-4.5k but for some reason all my camera would pick up that day was the low idle... i have though about remaking it but i dont feel like it...

scorpionp54

how does it sound under a load

oneadvent

could be an exhaust leak too

scorpionp54

i know i have an exhaust leak but its only when the engine is cold, but this had a different kind of sound to it

scorpionp54

just got my magnaflow on pics and video tomarrow.

sounds great