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#2 cylinder misfire code.

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#2 cylinder misfire code.
Old January 11th, 2021, 11:16 AM   #1
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#2 cylinder misfire code.

As I posted on a previous thread I took my 2000 Viper out and when I got home I got the check engine light. Put my OBD2 scanner on this morning and it popped with a PO302 code “#2 cylinder misfire”
What is the best method for determining the cause. Connections to coils all look good and connected. Battery is fully charged, plugs wires all seated properly. Is safe to assume it a bad #2 coil? What do you all think?




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Old January 11th, 2021, 11:31 AM   #2
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Spark plugs are cheap. I was recently convinced that I had some sticky injectors, so I had them cleaned and flowed. Didn't fix it. Checked wire resistance and all was good, spark was getting to the plug boot, so new plugs ultimately fixed the problem.
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Old January 11th, 2021, 11:56 AM   #3
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Quote:
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Spark plugs are cheap. I was recently convinced that I had some sticky injectors, so I had them cleaned and flowed. Didn't fix it. Checked wire resistance and all was good, spark was getting to the plug boot, so new plugs ultimately fixed the problem.

Not a bad idea, thought about that Spark plugs and upgraded wires have less than 1000 miles on them and are about 24 months old.


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Old January 11th, 2021, 12:30 PM   #4
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I wonder if you have an intake manifold gasket vacuum leak by the no.2 cylinder?
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Old January 11th, 2021, 12:36 PM   #5
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Spark plug wires are subject to degradation especially due to high engine bay heat. - A possible cause; but, I like the suggestion of looking at or replacing the easiest cheapest thing first = spark plug.
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Old January 11th, 2021, 01:36 PM   #6
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I had a full set of fresh plugs in the new engine with only 400 miles. I still had a bad one.
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Old January 11th, 2021, 01:40 PM   #7
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Okay, I’ll pull the plug and replace it and go from there. I’ve had “coil on plugs” fail in the past 2 years on my 4Runner which is what made me consider that as a possibility. That car is 8 years newer than the Viper.


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Old January 11th, 2021, 02:55 PM   #8
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It's hard for me to believe how frequently individual coils fail on modern engines. My Viper still has the OEM packs on it and they are nearing 25 years old.
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Old January 11th, 2021, 03:50 PM   #9
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Quote:
Originally Posted by FlashFerg View Post
Not a bad idea, thought about that Spark plugs and upgraded wires have less than 1000 miles on them and are about 24 months old.


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Make sure to use the SRT plug over the original. RC12ECC, Champ 438
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Old January 11th, 2021, 05:07 PM   #10
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The "common sense" approach would be to pull the plug wire from #2, arc it to metal, and see if it has a consistent/good arc while cranking.
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Old January 11th, 2021, 05:45 PM   #11
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That's what I did with #5 - strong spark.
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Old January 11th, 2021, 07:16 PM   #12
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A bright blue spark is best and a yellow/orange spark signifies weak ignition.
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Old January 13th, 2021, 10:52 AM   #13
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So I pulled the #2 plug. It looks bad. Has a distinct burn mark on the insulator. See pics of both side of this plug.






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Old January 13th, 2021, 10:58 AM   #14
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Quote:
Originally Posted by FlashFerg View Post
So I pulled the #2 plug. It looks bad. Has a distinct burn mark on the insulator. See pics of both side of this plug.
Is the gap correct? ( 0.033" TO 0.038" ) The photo makes it look narrow. ( could just be camera angle. )
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Old January 13th, 2021, 11:11 AM   #15
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Is the gap correct? ( 0.033" TO 0.038" ) The photo makes it look narrow. ( could just be camera angle. )

I agree, it looks way too small. I had these installed by certified Viper Technician here in Eastern NC. I think I can safely say this is the smoking gun. Now I probably should pull all of them.


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Old January 13th, 2021, 12:29 PM   #16
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It just looks cold fouled to me. You could open it up to the higher side of the range and screw it back in. It may clean itself up just fine. Best advice is to screw a new plug in it.
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Old January 13th, 2021, 12:59 PM   #17
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Quote:
Originally Posted by 99RT10>S View Post
Make sure to use the SRT plug over the original. RC12ECC, Champ 438
i saw this suggested before in other threads but i bought plugs before seeing any of this threads as I was buying a bunch of stuff from the same place.

Went with IRIDIUM XP (XP985) as they had a rebate but got screwed on the rebate.

Not installed yet.

Why the SRT (lazy/busy to search)?
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Old January 13th, 2021, 02:52 PM   #18
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Well, I replaced it with a Champion RC12ECC gapped at .35 and alas....still have the misfire code and it wouldn’t clear.
Now what? Wires are almost new and look perfect.


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Old January 13th, 2021, 03:25 PM   #19
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You need to determine if it's spark or fuel. Ohm 2 wires about the same length as 2. Determine KOhms/inch. See how it compares. Could be a coil pack.
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Old January 13th, 2021, 04:32 PM   #20
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Either find someone that knows how to diagnose and fix it... Or just sell it and move on.
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