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Causes of random cylinder misfire

This is a discussion on Causes of random cylinder misfire within the 2.0L LSJ Performance Tech forums, part of the Engine Technical Discussion category; My car randomly always throws the random cylinder misfire cel. What are causes to this? What causes random cylinder misfire?...

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Old 01-12-2012, 03:27 PM   #1
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Causes of random cylinder misfire

My car randomly always throws the random cylinder misfire cel. What are causes to this? What causes random cylinder misfire?
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Old 01-12-2012, 03:31 PM   #2
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sub'd, ive been getting the P0300 code here and there
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Old 01-12-2012, 03:33 PM   #3
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60s?
sometimes mine does this on 60s
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Old 01-12-2012, 03:35 PM   #4
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im running 60's
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Old 01-12-2012, 03:36 PM   #5
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I see a pattern
I know 60s are rough to tune with
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Old 01-12-2012, 03:37 PM   #6
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So many things can cause it. Ignition systems and misfires are probably the most difficult to solve. If your misfires are concerning you then take it in and have it looked at.
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Old 01-12-2012, 03:39 PM   #7
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usually there's a vacuum leak which can cause random misfires. Bigger injectors can also help it out....although I would check all of your hoses and listen carefully to everywhere there's a gasket (s/c to intake mani, intake mani to block, throttle body, etc.)
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Old 01-12-2012, 03:39 PM   #8
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Quote:
Originally Posted by tylerjclance View Post
I see a pattern
I know 60s are rough to tune with
im about to switch to 42's. on a 3.0 pulley theres no way i could even come close to maxing them out, i think 60's are overkill for my setup
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Old 01-12-2012, 03:40 PM   #9
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Plugs, plug gap, better tune
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Old 01-12-2012, 03:44 PM   #10
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upgraded iridium's set to stock gap
Only misfires at idle
not really too much of a concern

I think it's from the rain. LOL
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Old 01-12-2012, 03:48 PM   #11
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Quote:
Originally Posted by tylerjclance View Post
upgraded iridium's set to stock gap
Only misfires at idle
not really too much of a concern

I think it's from the rain. LOL
My plugs caused me p300 everyday at idle till i switched them. What kind of plug?
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Old 01-12-2012, 03:48 PM   #12
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Yeah i'm on 60's and it's usually at idle I got new plug and everything. Just wondering cuz I'm tearing all the blower stuff off to go turbo so I was gonna check it out cuz i don't want that happening anymore it's annoying
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Old 01-12-2012, 03:49 PM   #13
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basically, you just have to go down the list of diagnosis charts to find the root cause. Essentially, anything that is involved with the combustion inside a cylinder (fuel, air, spark, compression) can cause a misfire. There are more common reasons than others, but not enough to rule out anything else.
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Old 01-12-2012, 03:51 PM   #14
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IRIDIUMS LOL
I think rain may be a factor. Meh, not concerned, only at idle.. Especially when i Turn the defrost on. LOL
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Old 01-12-2012, 03:54 PM   #15
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tyler what did you have on there before? ngk's???
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Old 01-12-2012, 03:58 PM   #16
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Mine misfires pretty frequent. Im on the stock plugs at 31k tho. Lol. Running an aggressive tune at that. I think I need plugs very soon.
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Old 01-12-2012, 04:01 PM   #17
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what plugs do you guys recommend? im currently using NGK iridiums
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Old 01-12-2012, 04:05 PM   #18
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Quote:
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what plugs do you guys recommend? im currently using NGK iridiums
That's what is recommended. Ngk's.
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Old 01-12-2012, 04:07 PM   #19
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unless you have a large turbo or are running any pulley smaller than 2.6, I don't personally see any reason to run the stock ngk's that are in an lsj. Not sure what's in the lnf though.
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Old 01-12-2012, 04:08 PM   #20
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Before I switched to 60s I had stock plugs in, changed the plugs right before I put the 60s in

It's on the list of things to do test with my new build
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Old 01-12-2012, 04:11 PM   #21
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it's just iridiums to me seems absolutely pointless unless you know for a fact that you're running cold air into your cylinder, or you know for a fact that you're experiencing spark plug blowout no matter how much or little they're gapped.
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Old 01-12-2012, 04:27 PM   #22
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missfires come mainly from a **** tune and bad injector settings and irridiums are not whats recomended
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Old 01-12-2012, 08:23 PM   #23
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What's recommended then? For my build everybody told me to use iridium
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Old 01-12-2012, 08:29 PM   #24
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Quote:
Originally Posted by drumrush View Post
im about to switch to 42's. on a 3.0 pulley theres no way i could even come close to maxing them out, i think 60's are overkill for my setup
Yeah, I was thinking about going back to my 42lbs as well(prolly not tho cause I love my 2.7), 60's are just a pain in the ass, I get that P0300 Code too and my car also Idles like Crap...If your looking for 42lb Injectors I have a Practically Brand New Pair that I'll sell ya.
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Old 01-12-2012, 08:32 PM   #25
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Quote:
Originally Posted by tylerjclance View Post
upgraded iridium's set to stock gap
Only misfires at idle
not really too much of a concern

I think it's from the rain. LOL
^^^THIS^^^ I Think the same as well, I seem to only get the CEL when its Effen Raining outside or if I'm sitting and Idling for a very long time.
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