Misfire after spark plugs

[Stl-986]

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

[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.