300zx in help needed will turn off after 5 min of been on!!

[izard]

so my Z 1992 2+0 N/A turns off after 5 min of been on if i try to turn it on again it will turn on but if i don't accelerate it will turn off again if if i start going it will run but not for to long distance and if it dosent turn off it will go really slow like if its missing gas here is the thing! this mechanic told me it was the fuel pump just by hearing my story i checked the fuel pump and it pumps gas i change the filter and same thing could it be like a switch or a chip? maybe some wires ot wet and i just went from hot weather to cold live in C.A not to cold..o yea i think i should let u guys know this the day befor a hose from the radiator got messed up and got a little water on my engine the hose run in the bottom of the engine maybe that couse the problem ??but idk because it turns on and everything i might get a video later on to show u guys..=[ hope to hear soon from you.. i was about to get this beautiful body kit and paint job in it =[ but got to fix it with that money now[

[emiliog2276]

Someone correct if i wrong but wouldn't a car not run at all if pump is bad not run for a while and then die. I would start by checking all your connections, check your ECU for any codes. Check your PTU. When the PTU is going bad the Z will run properly when the PTU is cold but once it gets hot(to the touch) the car will stall. Remember the first time i checked it the car would stall after a short time of being on , use multimeter to check it. Although when i knew little about the Z to check it i actually put it in the fridge to cool PTU down and then reinstalled it to see if the car would run once again until the PTU heated up again.

[izard]

yea it stalls when it gets hot i gues ill try this thanks!

[marty1mc]

There is also a product called "circuit freeze" and comes in an spray can. We used to use it to test chips that were failing without pulling the circuit board. It can be ordered online.

[izard]

so i can just spray the PTU with that spray and turn it on ? how long will the car stay on if the problem is the chips?after i put it?

[izard]

There is also a product called "circuit freeze" and comes in an spray can. We used to use it to test chips that were failing without pulling the circuit board. It can be ordered online.

can i get it in autozone? or cna u give me the link of the website where you purch it please

[carmon240]

I had this exact same problem where my PTU would get rediculously hot, amazing solution.. Check the ground wires..surprisingly if it has a bad ground...that mother will get really hot and affect the motor.There are about 3-4 ground wires if you follow the harness from the front of the motor to the back. Check for loose grounds and then let it run and see if the PTU still gets hot, mine was an instant fix.

[izard]

i will try it thanks!

[Blurr]

I had this problem when my MAF (MASS AIR FUEL SENSOR) started going bad.

WHen you turn the key to the ON position, if you hear a buzz, typically its your fuel pump kicking on.

Heres what I learned from people here on Nico, and several other forums.

Before doing anything, check the ECU for codes.
http://www.nicoclub.com/archives/nissan ... ostic.html

Heres what I did when I got the code for my MAF.
http://www.twinturbo.net/nissan/300zx/f ... ensor.html

Turned out my MAF was going bad, and I needed a replacement one. I have a hook for MAF's for 60 bucks, brand new. I also cleaned the grounds around the motor, and it helped with smoothing out the idle and alot of other problems I was experiencing, bogging, etc.

If you can, get Nissan to replace the PTU. its free because its still under recall.

[izard]

thanks for the good info guys im gonna try all this steps later on at ngiht

[Blurr]

Any Luck izard?

[izard]

hey guys im sorry abou the late replys iu just arrive last night i had to leave the country for a emergency. i took my 300 to mechanic today ill let u guys know whats up when i get it fixed! =]

[izard]

hey guys i got my 300 back up running! a hoes had ripped and got my cables wet includding the PTU had to change the PTU and clean all the cables where they connect thank you all for the help excuse my bad english =]