19th Jan 2010, 15:11

I have a 84 Nissan 720 with a Z24 motor. We rebuilt the carb because of the chugging it was doing after replacing the fuel filter and other things, but my manual does not show the vacuum lines going to the driver side carb; we have traced them all and have 3 lines off on the carb; cannot find where they go. Does anyone have a diagram that we can look at to try and fix this? It's my wife's truck, her baby as she says. Please help before she kills me LOL.

Thanks sb.

18th May 2010, 16:36

I've got an 84 model 720 FWD diesel and I love it. I take it bush bashing with my mates in their Land Cruisers and Patrols, and it goes anywhere they go with ease. Finding parts for it is incredibly hard, I can't find a pitman arm for it anywhere, Nissan don't make them any more, can't find any after market, it's a real worry. I love my 720 and I'd hate to part with it over a pitman arm.

10th Jul 2010, 18:12

This is for the last comment; you can get those parts here in the States, but it will cost you money to ship there. The site is auto parts warehouse or shop, not sure, but one of those has the parts you need.

13th Aug 2010, 09:51

I am having the same problems with my 84 Nissan as the person who wrote in on the 20th of Jan 2009. Whoever that was, did you fix it and how? Does anyone have any answers?

I have a 1984 Datsun 720 pickup truck. The problem I am having is that is runs like a top, then suddenly at any given time, it decides to sputter and miss out going down the road. After I give it time off, I can start it again and it will run like a top for a while, and then the same thing happens -- sputter, miss out, die. Sometimes it won't even start.

I have owned it for almost a year, and it started doing this about May. I have changed the coils, the plugs, the fuel filter and the fuel pump. What else do you think it could be?

6th Sep 2010, 19:11

I had the same issue, running like a top then it would die. Turned out to be the fuel pump relay under the dash on the drivers side of the truck. I got one at Kragen for $50, I think and have not had the problem since.

13th Dec 2010, 15:59

Just wanted to let you know, I still have my '84 720 I commented back on 3 Mar 08. It now has 55,000 miles and running stronger than ever. Lowered it a couple of inches all around, removed cat., and put on a tuner exhaust. Also I tweaked the timing, that allowed the secondary to open up and what a big difference that made. Anyway, long live the mighty 720!!! By the way, it is still poop brown.

27th Dec 2010, 22:41

I would like to hear from the person with the 84 Nissan King Cab 4x4, with the diesel engine.

Address is jimfromsardis@gmail.com

18th Apr 2011, 10:32

What have you done to your trucks?

I have a 1984 Nissan truck with 160000 miles on it. I completely rebuilt the whole engine, new pistons, bored it out, reset the valve. I did everything but the vacuum lines and the carburetor is the stupid part about those things.

I really love the truck though.

18th Apr 2011, 15:56

How can I tell which engine I have?

22nd Apr 2011, 17:51

Try rockauto.com. I have found parts for my 1984 to be cheap in price and fast delivery.

10th Sep 2011, 15:59

I had a similar issue with my 84... actually a couple times... First time was the carb and second time was the ECU (ECM).

29th Sep 2011, 22:01

Umm, I have the 1984 Nissan pickup, and it was doing the same thing. We figured that it was the throttle plate, so you may as well buy a new carb or get the one you have rebuilt. I'd check your fuel filter too; your choke could be sticking too.

12th Nov 2011, 18:06

I bought my 1984 Nissan pickup brand new. Have not had many problems with it, and it just turned 96,000 miles. Power windows don't work as good as they used to do, but neither do I.

I am also having the same problem now with it running great, and then it starts bucking and will not run. Has anyone found out what causes it? I have seen lots of thoughts, but not anyone has said they fixed it.

If you have found a way to fix it, email me at terrymorr2003@yahoo.com

Thanks to all 1984 Nissan pickup lovers.

20th Mar 2012, 22:24

Hey, I just bought a 1983 Nissan 720 4x4 king cab truck with the 2.4 Z24 engine. It has a mild rear main seal leak on the engine, and an exhaust leak at the muffler. Everything else seems OK.

The carb was just rebuilt, but I am having a problem with my temp gauge and my fuel gauge not working. They went out at the same time I was told. I thought it was the temp sender on the manifold; replaced it, didn't help, but the temp gauge moved when the guy used the check light on it, and grounded it or something. I see this is a problem with a lot of these trucks. Does anybody know how to fix it, because if you let these engines get hot, they seem to blow head gaskets. Are cracked heads pretty easy? HELP.

20th Oct 2012, 07:41

I have a 1984 Nissan/Datsun, with a 2.4 engine, started making pecking noise like a hole in the muffler, which it did have. Put on a new one, still the same, put on doughnut gasket, still the same, put on exhaust gasket, still the same. Running out of options, and need advice.

26th Feb 2014, 17:58

I read on the internet that these vehicles have two relays for the fuel pump, located in the dash by the glove compartment. Apparently if you open up the relay, you might find cracked solder connections. Resolder the connections and it should be OK.

2nd Apr 2014, 19:01

The exhaust manifold commonly cracks where the ports all join above the outlet flange. You usually have to remove the heat shield to see the area clearly.

11th May 2015, 02:43

The ECM was under the driver's seat or passenger's seat. I'm having the problem of taking off and it sputtering, and if I give it time, it picks back up...

16th Jun 2015, 08:28

Mine is silver and rust, held together with bondo.

24th Jul 2015, 19:11

Check the underside of the hood for a diagram of the vacuum lines.

11th Aug 2015, 01:11

They go to the altitude compensator.

29th Feb 2016, 04:06

I have a 84 Nissan 720 4x4. Just installed a new fuel pump and filter. It runs great, but now sometimes it won't idle. If anyone can help me on this, it would be greatly appreciated.

6th May 2018, 21:02

Hope you still own the truck! I found an 84 Nissan King Cab 4WD for 450$. Bed turned flat bed. I'm yanking the motor due to water in the oil, thinking of a complete overhaul kit and remanned head and cam. If anyone has any advice, I'd appreciate it!

Hit me up at spookyda@gmail or Icloud. Front clip comes off tomorrow, lucky me has a friend and body shop. Very little rust, but it's here to prep and paint once done.