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Old 03-02-2021, 05:07 AM   #1
tannerg1223
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Default 96 hardbody misfire

Creating a new post because my old one was in the wrong catalogue, sorry I’m a new member. I bought my hardbody 4 years ago and it has always has a misfire on idle to about 3500 rpms. Here’s a list of things I’ve done to the truck.

I own a 96’ Nissan hardbody 2.4l KA24E XE

-new spark plugs (I’ve ran NGK coppers, silvers and now iridiums)
-new oem wires
-new distributer (spectra power, aftermarket oem)
-new coolant temp sensor
-new water pump
-new timing chain and guides (to avoid KA rattle)
-new thermostat
-recently set timing to 15 btdc, it was off by just a hair

Other non important mods that haven’t seemed to change the issue
-custom intake (I have a k&n clamped to stock intake tube)
-custom exhaust (catback 2.5”>cherry bomb>blast pipe)
-lowered 3”

I’ve also tried copious amounts of injector cleaner over the years and no success. My truck makes what I believe to be lifter tick on startup but goes away as the truck warms up. I’m stumped. I want to turbo my truck in the next coming months but I don’t want to make an issue worse when I’m running 7psi. No I haven’t done a compression test and I plan on doing one soon, but any other ideas would be greatly appreciated. I’ve sprayed the engine bay with carb cleaner to look for a change in idle to no avail but I purchased 25’ of vacuum line today anyways.

Any help or ideas are welcome. I’m an aspiring mechanic and no one seems to know what the issue could be. Hence why I now belong to IN. Any sensors or other things I could be missing? Thank you guys in advance!!

Last edited by tannerg1223; 03-02-2021 at 05:10 AM. Reason: Forgot to mention it’s a KA
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Old 03-02-2021, 05:39 AM   #2
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I'll throw this back out... unknown, but I've seen it on inline 4cyl motorcycles. Granted, carb'd..... but it's adjustable with a carb, not so much with these Nissan computers... or is it?

I now wonder about your air/fuel mix, since you're no longer running stock. More back pressure and different air intake can mess with the computer. Your thoughts?
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Old 03-02-2021, 03:48 PM   #3
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Originally Posted by 89'HBV6 View Post
I'll throw this back out... unknown, but I've seen it on inline 4cyl motorcycles. Granted, carb'd..... but it's adjustable with a carb, not so much with these Nissan computers... or is it?

I now wonder about your air/fuel mix, since you're no longer running stock. More back pressure and different air intake can mess with the computer. Your thoughts?
Live data says my idle is 14.7:1. Stoichiometric. Before I did the intake mod it still missed unfortunately. Im beyond confused too
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Old 03-02-2021, 04:16 PM   #4
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Unless you go forced induction exhaust/intake will be compensated for by the ECU. Once you go FI you'll need a piggyback, reflash, or some such to get the fueling right but that's a future problem.


Does the miss always seem to be on the same cylinder, or does it move around? I'm guessing you've verified the plug wires are plugged up correctly with the FSM rather than relying on a PO to have wired it correctly?
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Old 03-02-2021, 04:38 PM   #5
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Let's go back to zero. It's a 96. Have you pulled codes from ODB?
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Old 03-02-2021, 10:17 PM   #6
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Quote:
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Let's go back to zero. It's a 96. Have you pulled codes from ODB?
I have tried, but the miss has never sent a code.
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Old 03-02-2021, 10:18 PM   #7
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Today I thought maybe it’s the catalytic converter? So I gutted it and still there’s a miss XD I guess we can rule out exhaust as a problem LOL!
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Old 03-02-2021, 10:21 PM   #8
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Quote:
Originally Posted by OldGreyBeast View Post
Unless you go forced induction exhaust/intake will be compensated for by the ECU. Once you go FI you'll need a piggyback, reflash, or some such to get the fueling right but that's a future problem.


Does the miss always seem to be on the same cylinder, or does it move around? I'm guessing you've verified the plug wires are plugged up correctly with the FSM rather than relying on a PO to have wired it correctly?
In the future I plan on running an SAFC so I can compensate for the leaner mixture. But right now I need to find the misfire’s root cause so that I don’t amplify my problem when the strain is greater on my engine lol

For the wires, I’ve ran them from the distributer via the marks on the top of the cap. There is a 1,2,3&4. It runs and accelerates fine, no drop in power that I’ve ever noticed as I’ve ran the truck to 100mph a few times. It’s just the weird idle-3500 rpm miss that’s random and scary.
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Old 03-02-2021, 10:31 PM   #9
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Does it seem to always miss on the same cylinder or does it move around? Could be a wonky injector that's working better at higher output but on the lower end it's being goofy.
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Old 03-03-2021, 03:17 AM   #10
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Likely an injector and exhaust manifold leak.

Also sounds like you need to do the timing chain and guides. That will cause the lifter noise.
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