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Nissan Forum: Petrol Hardbody 2,4 16v fuel consumption
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Old 01-11-2018, 03:17 PM
Tkay Tkay is offline
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Default Petrol Hardbody 2,4 16v fuel consumption

Hi, im purchasing a hardbody with around 160k mileage and would like to know what to lookout for and what is best figures on fuel? And what is the best mileage to replace chain and what is the indicator...
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Old 01-12-2018, 12:02 PM
jp2code jp2code is offline
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Location: Longview, TX [USA]
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If you have stock tires (195/75/14), the 4 cylinder, 2 wheel drive, and manual transmission, you should be looking at around 20 in town and 24 to 26 on the highway.

These trucks were designed back when the maximum highway speed was 55 MPH, so their fuel mileage can drop a lot as you get up over that speed.

There is usually a plate or decal on the driver's side door jam that will have an Axle Code written on it. In my picture below, you can see that I have the HG46 axle. HG is limited slip. HF is non-limited slip. 46 means 4.6:1 rear gears. A typical 4 cyl, 2wd, manual trans truck should have HF35 or so (non limited slip, 3.5:1 gears). A bigger number means a lower axle gear, so worse fuel mileage.

Picture link: https://i.imgur.com/sUqYc.jpg

As far as engine maintenance, it depends somewhat on the year. Earlier trucks had the Z24i with 2 spark plugs per cylinder. Nissan switched to the KA24e in 1990 (I think). The Z24i can run almost forever, but does not make as much power as the KA24e. Also, the KA24e is much better suited to upgrades because it uses the same engine as found in the 240SX (just different heads and intake).

If the truck has the Z24i, just do basic maintenance. Oil and filter changes. Keep the air filter clean. Get a timing light so you can make sure the timing is correct at 10 degrees (performance and fuel mileage can drop fast if the timing gets off). Get a new distributor cap, rotor, and plug wires every 40,000 miles or so.

If the truck has the KA24e, do the same maintenance as listed for the Z24i above, but also it uses a plastic tensioner on the timing chain. The timing chain itself could last forever, but the plastic tensioner and weak tensioner spring will not. As the tensioner wears down or the tensioner spring stops springing the tensioner back onto the timing chain, you get slack in the chain which will cause it to jerk on the timing chain, causing the chain to stretch. The way to tell this is the engine will make a lot of noise when it is cranked. You will hear a lot of rattling around on the top end. There are lots of kits for replacing the tensioner and spring. Good ones should come with a new water pump, timing chain, and timing chain gear. The water pump is what the tensioner bolts to. If you get the engine pulled apart far enough to do the "timing chain job", why not spend $20 extra and replace the water pump while you are there?

So, what else do you want to know?
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~Joe (not a mechanic!)
1994 Heavy Duty D21, Long Bed, 2WD, V6, 5-speed
Free Hardbody Service Manuals: http://www.nicoclub.com/FSM/Hardbody/
Trouble Codes for Nissan 1988-1995: http://nissanforum.org/nissan-forum/showthread.php?t=23202
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