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Old 06-11-2019, 09:45 PM   #1
cheesecake.grant
 
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Default P0300 Multiple cylinder random misfire code

Can yíall please help me troubleshoot this code? Iíve had issues with the spark plug ports in my head that Iíve tried to fix, but I may have only made it worse. Before I got this code and retapped the #3 port, I had a cylinder 4 misfire code. What should I look for and where should I start. The truck still drives and idles, but itís the roughest idle youíve ever seen as well as some trouble starting sometimes. I set the timing spot on with a timing light, but pretty regularly the truck hesitates at start up
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Old 06-12-2019, 01:53 AM   #2
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What’s the story on the cap, rotor, plugs, and plug wires? Are those new?
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Old 06-12-2019, 02:49 AM   #3
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Lots of possibilites, including those and a bad fuel injector.
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Old 06-12-2019, 01:30 PM   #4
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Plugs and wires are new. Cap and rotor are both likely original to the truck. Gonna replace both today. All injectors are brand new green cap gp Sorensen’s
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Old 06-13-2019, 03:09 AM   #5
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Good. If those don't fix it, I'd do a compression test, and then a smoke test (for vac leaks).
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Intentionally near-stock
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mud and snow tires, HD trailer hitch (cat 3+),
liquid bed liner, G1W dashcam
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Old 06-13-2019, 06:03 PM   #6
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Even though the wires are new, I would verify your routing to make sure they are not touching each other or any metal that it could arc to.
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Old 06-14-2019, 03:24 AM   #7
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Wires look good. The new cap and rotor seemed to help a lot but I’m not sure. Smoke test is next on the agenda. And what do you mean verify the wires aren’t touching? Like the insulator or exposed parts?
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Old 06-14-2019, 02:08 PM   #8
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wires laying on each other.






separators not only make a clean install but serve a purpose to separate the wires so they don't touch. This guy should have run the #1 and 2 wire around 3 and 4 instead of between. wires are touching.
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Old 06-15-2019, 02:39 PM   #9
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Quote:
Originally Posted by dvdswan View Post
Even though the wires are new
And maybe try swapping, fully, #1 and #4's wires, for example, to see if the problem moves. A long time ago I got a bad new wire.

Triple-double check your firing order/wiring, of course ...
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1990 Nissan Hardbody, Aztec Red
Standard cab, 4x4, KA24E, 5-speed
Intentionally near-stock
Mods: Second OEM horn, stereo/speakers/sub,
mud and snow tires, HD trailer hitch (cat 3+),
liquid bed liner, G1W dashcam
Definitely not for sale!
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