‘84 NA Auto has fuel and spark, won’t start?
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Registered User
Joined: Apr 2018
Posts: 6
From: Lubbock, TX
‘84 NA Auto has fuel and spark, won’t start?
I have an 84 300zx, my pops left it sitting for a decade, and I’m tryin to resurrect it. I’ve got a new battery w/ 525 crank amps, new spark plugs(and dropped mystery oil in plug holes) new fuel pump, and fuel showing on the return line past the pressure regulator. Got good spark, tested only one plug, have tried cranking w/ MAF sensor connected and disconnected, When I crank, it sounds dry, like no fuel gets into the cylinders, and the ECU reads code 31. Any ideas would be appreciated! Thanks gents!
Registered User
Joined: Nov 2013
Posts: 300
From: east KS
Stop with the starting spray , use a squirt bottle with gas ,carefully ,only
starting spray is only for exterme cold carbed cars
got injectors clicking? check compression , how fresh is the gas? You want it oiled good before it fires any way I pull 2 plug wires on a start up
starting spray is only for exterme cold carbed cars
got injectors clicking? check compression , how fresh is the gas? You want it oiled good before it fires any way I pull 2 plug wires on a start up
Registered User
Joined: May 2010
Posts: 114
From: Orlando, FL
I’m going with injectors plugged. Like above if they don’t click, open and close, you won’t get fuel. I just went through this with an 87 NA. Had to clean them one by one and jump them to get the, to open and close. Car on sat for about 2 years.
Registered User
Joined: Nov 2013
Posts: 300
From: east KS
They wont pump out the right fuel no matter how clean if the pump is weak ,check fuel pressure
I believe I got the last fuel pump assy. For z31, Usually they are cleaned by running the engine with a tank cleaner
Thread Starter
Registered User
Joined: Apr 2018
Posts: 6
From: Lubbock, TX
I was doing some rust abatement on the battery tray, and pulled a couple bolts off the side of the tray, what looks like a fuse box came out from under the tray. I’m having trouble identifying this component, anybody know what this is?
Registered User
Joined: May 2010
Posts: 114
From: Orlando, FL
From under the tray? There is a black box on the side that has three fusible links in it. Got a pic?
Registered User
Joined: May 2010
Posts: 114
From: Orlando, FL
That is the fuel pressure regulator module.
300zx Parts For You webpage
have you down loaded the FSM from Xenon? They have a pretty decent diagnostic pages.
XenonZcar.com Z31 1984-1989 300zx Reference
300zx Parts For You webpage
have you down loaded the FSM from Xenon? They have a pretty decent diagnostic pages.
XenonZcar.com Z31 1984-1989 300zx Reference
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