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Old 09-23-2021, 11:57 PM   #1
EJSS
 
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Changed Spark Plugs now misfire on all cylinders

Im left sort of speechless on this one...

I changed all of my spark plugs last night on my L99, went with the same exact plugs that were already in, the GM 41-110 Iridiums. Same spark plugs, same gap. Misfires on all cylinders, knock retard going crazy... I can hear an audible knocking/tapping sound on my way home from work.

So tonight, I just pulled all 8 of the new plugs out and replaced the old plugs back in. No more misfires, everything is back to normal. WTF? How does the car know the difference between the new ones and old ones?? Why does it like the old ones more? Same exact plugs with the SAME DAMN GAP. C'mon man!
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Old 09-24-2021, 05:00 AM   #2
102SS
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Maybe your new plugs were dropped or handled roughly before you bought them.

I put Denso Iridium's in mine and everything is fine.
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Old 09-24-2021, 06:03 AM   #3
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Where did you buy your new plugs from? Could be cheap knock offs from ebay or amazon.
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Old 09-24-2021, 07:11 AM   #4
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Old 09-24-2021, 07:33 AM   #5
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Nevermind problem came back lol. Spoke too soon
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Old 09-24-2021, 07:34 AM   #6
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Quote:
Originally Posted by Y88 TA View Post
Where did you buy your new plugs from? Could be cheap knock offs from ebay or amazon.
This!!! There’s a flood of Chinese knock offs on the market, they can be a little hard to spot from the real ones.
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Old 09-24-2021, 07:37 AM   #7
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Quote:
Originally Posted by EJSS View Post
Nevermind problem came back lol. Spoke too soon
Now that you have replicated the problem with the old plugs, it's time to consider whether the wires are OK. It's not hard to damage them if you take them off roughly.
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Old 09-24-2021, 09:05 AM   #8
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Now that you have replicated the problem with the old plugs, it's time to consider whether the wires are OK. It's not hard to damage them if you take them off roughly.
^^^ this, I have seen where the connectors inside the boot come apart and not make a good connection anymore and cause problems. Check the plug wires.
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Old 09-24-2021, 01:33 PM   #9
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If it has factory wires replace them. Mine where original last year and many where dry rotted. By removing them you might of compromised there integrity of them and now they are giving you problems.
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Old 09-25-2021, 12:08 AM   #10
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Thanks everyone, I will be replacing the wires ASAP and I'll do an update once it's done.
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Old 09-25-2021, 01:38 AM   #11
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As the plugs age, and the gaps widen with age, the ECU adjusts. When you replace
the plugs, the timing will be off slightly, the ECU needs reset. The "learning"
is gradual as they age, then you jump down to a gap that's original, which will be
smaller than the old plugs. IT happens...

Also, yeah, the connector in the boots can pull out of the crimp... Just had that
happen on my Mustang, but only two of them.
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Old 09-25-2021, 03:01 AM   #12
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Check the flow of charge with electric tester. might have a bad wire or 2.
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Old 09-27-2021, 11:46 AM   #13
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I had this happen once. Turns out I didn't push the plug cables all the way in.
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