84 NA Auto has fuel and spark, wont start? - ZDriver.com


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Old 04-29-2018, 08:53 PM   #1  
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84 NA Auto has fuel and spark, wont start?

I have an 84 300zx, my pops left it sitting for a decade, and Im tryin to resurrect it. Ive 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!
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Old 04-29-2018, 09:08 PM   #2  
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Sorry, forgot, it will fire with ether into air intake.
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Old 04-30-2018, 09:13 PM   #3  
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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
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Old 05-01-2018, 05:37 AM   #4  
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If it starts with ether in the intake then it's probably not getting fuel otherwise.

Something between the fuel rail and the cylinders is not functioning. Fuel injectors?
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Old 05-01-2018, 05:39 AM   #5  
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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.
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Old 05-01-2018, 02:46 PM   #6  
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Okay, thanks for the input guys, Ill pull the injectors and get em cleaned up.
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Old 05-02-2018, 08:45 AM   #7  
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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
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Old 07-08-2018, 07:27 PM   #8  
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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. Im having trouble identifying this component, anybody know what this is?
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Old 07-09-2018, 04:48 AM   #9  
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Quote:
Originally Posted by Humvees2Zs View Post
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. Im having trouble identifying this component, anybody know what this is?
From under the tray? There is a black box on the side that has three fusible links in it. Got a pic?
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Old 07-10-2018, 09:05 PM   #10  
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From under the tray? There is a black box on the side that has three fusible links in it. Got a pic?

Y
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Old 07-10-2018, 09:07 PM   #11  
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Sorry, yes under the metal battery tray. And if this is fusible links, would one of them be the one that goes from the ECU to the injectors?
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Old 07-11-2018, 04:36 AM   #12  
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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
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