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Old 11-04-2020, 12:56 PM   #1
Kevin Lewis
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Exclamation Need Help diagnosing

I have my 1993 Nissan Hardbody 2.4l and i am concerned with some popping noises coming from my exhaust. It only happens when i decelerate. I hear a popping noise that wasn't there before. If im cruising steady it doesn't do it so Im not sure if its a fuel issue or something else. im sort of new with this kind of stuff. Any help id appreciate it!

Last edited by Kevin Lewis; 11-04-2020 at 06:42 PM.
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Old 11-04-2020, 03:16 PM   #2
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backfire? might see if there are any codes
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Old 11-04-2020, 09:44 PM   #3
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Classic sign of a sticky exhaust valve. Or running too rich.
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Old 11-05-2020, 06:57 PM   #4
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how is this a "sticky exhaust valve" ive literally never heard that.

sometimes in the transition from accel to decl all the fuel doesnt get burned in the cylinder and it gets sent out the exhaust. little bit of "running rich" for a second and you get this feature.


you might be suddenly hearing it because your muffler is worn out or theres a small hole in the exhaust you just recently acquired etc. my point is, it might have been happening before but you just now noticed it.
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Old 11-10-2020, 03:50 AM   #5
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Yea, check your exhaust. Do you have any leaks/holes? Is it loud(er than normal)? Improper back pressure, or............

Running rich. Search the forum for carb cleaning for your 2.4.

A few questions:
FI or carb'd?
How long have you owned?
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Old 11-10-2020, 10:23 PM   #6
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testing, testing....
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Old 11-12-2020, 05:47 PM   #7
Kevin Lewis
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89'HBV6
This one is FI, I bought the truck from one of my dad's friends and they had everything replaced. I bought it with no problems ive had it for about 6 months now.
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Old 11-12-2020, 07:38 PM   #8
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OK, thanks for this.

Well, per your other thread you said the exhaust was replaced/worked on recently and that it's not stock. I would still wonder if there's too much, or not enuf, back pressure...... and being FI, I don't know about rejetting for a "non-stock" situation. (ol'school carb guy here and know a bit about tuning/jetting)

I would still suggest doing a basic carb cleaning. I'm still feeling it's a fuel/air issue.



update: OH, please stick with one thread on this issue, K? ......thanks man!
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Old 11-12-2020, 11:01 PM   #9
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Air filter new/clean? I've had a new Chinese cheapo air filter have too much air pressure drop vs. OEM for one of my yard tool's engines.


(Upstream) O2 sensor functioning and newish?
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Old 11-13-2020, 12:05 AM   #10
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you know every car ive ever had gurgled and popped a little on decel. it was more a matter of could you hear it before or not.



and to 89'hb, there is no such thing as "rejetting" with a fuel injected motor. you need some kinda piggy back ecu if youre willing to only take fuel out (leaner) or a full on standalone if you want to add fuel back in. thres a few piggy backs that can add fuel in but, meh.
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