Misfire after spark plugs

[Escott1622]

This is the plugs I just pulled now, does not match what was said here previously

[dghii]

Look, don't over complicate things.
You changed plugs and have had an issue since. When you change plugs, you remove coils. Coils were (are) original and were at least disturbed when you performed the work.

If you have the right plugs, torqued to correct value, the most likely issue is coil or coil connection. Check connections to coils and drive the car. Check for misfires and codes. Clear codes if needed and drive again. If you still have misfires, Buy 1 or 2 coils and put them in offending positions if you don't want to spring for 6 right now. Clear codes, drive, repeat. You'll get it!

[Starter986]

Please, post much larger pics.

Or, send glasses.

[Seal1968]

Originally Posted by Starter986

Please, post much larger pics.

Or, send glasses.

I LOL'd here Starter. LOL'd.

Look, as stated, you changed the plugs and there's now an issue...likely due to old coils being unseated, a connection is loose, or one or more has failed.

Should be an easy fix.

[Escott1622]

Originally Posted by Starter986

Please, post much larger pics.

Or, send glasses.

Sorry for the picture, it was of the spark plug model BKR6EIX. On ngk website it says that is the correct one

[Stl-986]

Doesn't matter if NKG site says those fit or not, they are the wrong plugs. Get the right plugs & replace them.
https://www.pelicanparts.com/catalog/SuperCat/1044/POR_1044_ELIGNT_pg1_spark-plugs.htm

Still think you should replace the coils too

[Escott1622]

Originally Posted by Stl-986

Doesn't matter if NKG site says those fit or not, they are the wrong plugs. Get the right plugs & replace them.
https://www.pelicanparts.com/catalog/SuperCat/1044/POR_1044_ELIGNT_pg1_spark-plugs.htm

Still think you should replace the coils too

What brand of what you sent do you advise most, there’s beru(matches the coils) Bosch and ngk

[Stl-986]

All are OK just pick your price point. I only use Bosch for plugs myself

[Escott1622]

Originally Posted by Stl-986

All are OK just pick your price point. I only use Bosch for plugs myself

Opted for Bosch. I should have them in by Thursday

[blue62]

Although plugs come pre gaped it is only prudent to check the gap before you install them.
Look each plug over and check the gap...the condition of the porcelain...the sealing washer.
Same thing if you install new coil packs. Look them over....make sure there are no manufacturing defects check that your wiring connections are clean and tight.
Make sure the contact point of coil pack to plug is clean.
Make sure they are fully seated on the plug.

Make sure the part you are installing is correct for the car.
Never assume that a new part is good just because it is new.
simple things like this can save a lot of headache and tail chasing.

[Stl-986]

Bosch plugs are 4 prong....dont do anything with the gap

[ike84]

In the words of Ron Burgundy... That escalated quickly!

I agree that this is likely a coil issue. New ones are cheap, and knockoffs work fine. I put unbranded Chinese ones on 2 years ago and have had no issue. I'm sure this offends some...

Injectors can also cause misfires. You don't have to hunt down the oem ones (theyre not even made anymore, you are only going to find reman'd ones). But, it is quite easy to retrofit the Bosch 986.2 pintle plugs for our cars. I wrote up a diy on this and they are cheap.

You can and should check gaps on ALL plugs before install, single or 4 prong. To gap a 4 prong plug, you need a different gap tool (a wheel with a bunch of metric"feelers").

Iridium vs standard, Bosch vs ngk vs beru vs denso.... I'm not gonna touch that one with a10 ft pole. Needless to say, just make sure that they cross-reference too the original OEM part. I know all lot of guys will say "I don't care what the manufacturer says..." But all yourself this question - would would a company risk their reputation saying they their part will work if it won't? That's not exactly how capitalism works...

Sent from my SM-G970U1 using Tapatalk

[blue62]

Originally Posted by Stl-986

Bosch plugs are 4 prong....dont do anything with the gap

Electricity follows the path of least resistance to ground.
Drop a plug on the concrete floor and bend one of those four prongs so there is very little gap.
That very small gap will be the path of least resistance to ground.
The spark will now....always jump that very small gap.
It will be a very weak spark.
Possibly causing miss fires.
There are gap specs. on plugs for a reason.
Plug gap should be checked no matter how many prongs they have.

[FoFoJoe]

I would also swap the coils. I had basically the same issue and symptoms you described 2 summers ago. Although my issue started on it's own, I hadn't swapped the plugs before.

Here is the kit I used. NGK plugs and Beru coils. No issues since.

https://www.ecstuning.com/b-assembled-by-ecs-parts/ignition-service-kit/99760210700ikt2/

60k miles and 20 years of service isn't bad for factory coils.

Also when you swapped the spark plug tubes what tool did you use?

I used a transom boat plug, 1" lol. Wrapped it in electrical tape and plucked all the oil tubes out perfectly.

[Escott1622]

Originally Posted by FoFoJoe

I would also swap the coils. I had basically the same issue and symptoms you described 2 summers ago. Although my issue started on it's own, I hadn't swapped the plugs before.

Here is the kit I used. NGK plugs and Beru coils. No issues since.

https://www.ecstuning.com/b-assembled-by-ecs-parts/ignition-service-kit/99760210700ikt2/

60k miles and 20 years of service isn't bad for factory coils.

Also when you swapped the spark plug tubes what tool did you use?

I used a transom boat plug, 1" lol. Wrapped it in electrical tape and plucked all the oil tubes out perfectly.

Boat plug here too, haven’t removed them yet but I bought it off Amazon

[Escott1622]

Pulled coils, end of one where the rubber meets the spark plug was ripped and wearing away. Looks like some new coils are in the plan

[Frodo]

So, did you manage to get rid of the misfire?
Just curious.

If so, did you try the new coil pack(s) with the previously installed NGKs? Or did you change two variables: coils AND plugs?

[Escott1622]

Originally Posted by Frodo

So, did you manage to get rid of the misfire?
Just curious.

If so, did you try the new coil pack(s) with the previously installed NGKs? Or did you change two variables: coils AND plugs?

If I remember correctly I put the correct plugs in and also replaced the one coil that the rubber was bad on. Been running like a Champ until I dukes of hazard over a curb at 60 a few weeks ago.

[Frodo]

You say you put in the “correct plugs” along with replacing the one coil. But I’m not convinced you had incorrect plugs in there before. The giant pic, haha, you included in your earlier post shows the exact same plugs I put in my car (also an ’01) in July. This car seems to like them just fine and, nearly 500 miles later, she’s still “running like a Champ” as you say, throwing zero codes. Stl-986 (different thread) all but guarantees she eventually will—I’ll believe it when I see it. If they’re the “wrong plugs” why would it take thousands of miles for that to manifest? Especially when plug issues are only one of several things that can cause misfires. I tend to agree with ike84: why would a reputable parts manufacturer (like NGK) risk their reputation by saying their part will work in a certain application (ie in a specific make/model) if it won’t? That just doesn’t make sense to me either.

I kind of hoped you’d replaced the coil and tried the new one with the NGKs still in there to see what would happen. But…if it’s runnin’ well now I guess that’s what matters.

Sorry to hear about your Dukes of Hazard moment…sh*&%t happens. I know. Ask me how..