Very Common Issue R33 Gtst S1 Sounds Like It's Missing

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As the title suggests my skyline sounds like it's missing.

I bought this car as a doer upper and have since got it running and 99% put back together but now I've got another issue

THINGS I HAVE ALREADY DONE ARE.

I have checked for air leaks with pressurised smoke.

Also tried the carbi cleaner trick but no change.

I have replaced the plugs but no change.

I have replaced the coil packs with red split fires.

I have checked timing marks all line up. and they do.

I have checked the wiring. NO PROBLEMS

TODAY

I'm going to take off 1 coil lead at a time and see if I can find which cylinder is playing up.

I haven't done a comp test yet.

I have heard of people going through a years paycheck finding the issue and it turned out to be a bum coil or plug. But seeing as there both new they should be ok.

I will keep this post going so just maybe I can save others from waiting time and money.

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Right. Job done.

What I done

I started be removing the plugs to the coils

Started with No#1. NO DIFFERENCE.

No#2 NO DIFFERENCE.

No#1 and No#2 NO difference (Weird I know)

No#3 No#4 No#5 No#6 all made a difference.

Pulled No#1 coil and Plug out and earthed it and it put out a nice big spark.

Pulled No#2 coil and Plug out and earthed it and it put out a nice big spark.

So I replaced them both coils and plugs and removed the

No#1 Injector plug. I put an LED into it and it was pulsing.So then I removed the No#1 Injector.

A couple of the yellow bits on the pintle were busted. But other then that it looked fine.

I removed the fuel pump fuse and turned it over whilst holding injector in my hand

and if it was working I would have felt a CLICK CLICK that they make when there

pulsing the fuel in. NOTHING.

Thought it might need an earth so I sat it in an earth but nothing still.

RESULT.

All coils were firing on time with the timing.

All plugs were receiving good current and producing more then ample spark.

All injector plugs were fine and all were making good pulse.

All injectors except No#1 & No#2 made pulse.

SOLUTION

REPLACE 2 injectors with ones borrowed from a friend

And see if that fixes the issue. If so. Replace ALL INJECTORS and top half inlet gasket

And some pipes that are hard to get to unless the intake is separated.

NEXT UPDATE WHEN I GET SOME INJECTORS.

[KiwiRS4T]

Do a compression test - you may have broken rings on 1 and 2 - you would be amazed at how well an RB25DET can go on four cylinders!

And try a known good CAS to see if that makes a difference (you can often tell a dud CAS by trying to spin it when it is off the car).

[Dan_J]

pending how bad rings are you will get the plugs foul up with oil hence misfire