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Datsun 280zx sputtering and popping

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#1 skiboatm


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Posted 22 August 2011 - 04:00 AM

Hey guys, troubleshooting question for you. Here's what I'm looking at.

My car was slowly running worse and worse, so I pulled it into the garage to go over everything a few days ago. I found out the culprit for my crappy idle and misfiring was a cap full of water that had corroded the connection. So after a new cap and rotor and wire brushing the contacts on the plug wires, it idled fine.

HOWEVER, when I tried to drive the thing, it still felt like crap. I'm gonna guess its starved for fuel, but this issue started right after I replaced the original injectors with new MSA OEM injectors.

If you have the time, I've got 2 videos below that I took of the car and the issues I'm having. You may or may not be able to hear the issue, because I've got the car running a 3-2 header straight into a 2.5inch pipe, terminated by a Vibrant black series muffler, so I know that it will be raspy and snap/crackle/pop a lot anyways.

Any pointers you guys could give me would be wonderful. I'm guessing I need to replace the fuel pump, but would like a little more confirmation than a hunch before I start dropping money on this issue.



#2 dexter72



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Posted 22 August 2011 - 07:01 AM

If you only replaced the injectors I would go back over everything you took apart when you replaced them. Make sure the terminal connections are not corroded.

Some things you can check:

While the engine is idling place a long screw driver against each injector and hold your ear to the handle end of the screw driver. :o) Listen to make sure each injector is clicking.

Remove the fuel filter and try blowing through it, If it is tough to blow through it is clogged and needs to be replaced. Should be easy to blow through it.

Get a fuel pressure gauge and check fuel pressure.

#3 Matt K

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Posted 22 August 2011 - 10:31 AM

Try taking off the TPS, coolant temp, & AFM connectors, clean them, grease with dielectric grease...
'04 G35 Sport Coupe, '78 280Z restomod, '82 ZX slicktop coupe (sold), modded '90 Mustang GT (sold), '93 240SX 600hp SR20DET (sold), '90 240SX 360 rwhp (sold), '73 Celica ST (sold), '90 Z32 TT (sold), '90 Z32 N/A (sold),'73 240Z (gave to my little brother).

#4 3rdgenzowner



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Posted 03 June 2015 - 07:52 AM

I am having similar problems But have replaced everything but the Injectors, I really do not want to due to cost. Is replacing the fuel injectors what I need to do. Can someone help me???

#5 Z Guy KY

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Posted 12 June 2015 - 08:16 PM

What model Z?


When you say you've replaced everything, what did you replace and why did you replace each of those items?



My Time Machine:  03/70 240Z #2472 - 919 Yellow - owned since 1980

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#6 NewZed


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Posted 12 June 2015 - 08:24 PM

I am having similar problems

Similar to this "My car was slowly running worse and worse,.... it idled fine... when I tried to drive the thing, it still felt like crap."  


That's almost too much detail.

#7 McDoogle


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Posted 12 June 2015 - 11:44 PM


Edited by McDoogle, 12 June 2015 - 11:45 PM.

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