So I decided to check my spark plugs the other day and they are the ngk irridiums. I cleaned them up and checked gap which they were all pretty good. I retorked them, which they all came out like they were just barely hand tightened, and checked the resistance on my coils. 4 were higher resistance so I swapped them for ones off of my spare engine. I used some dielectric grease in the ends of the cool boots. Started it up and it ran smoothly. Didn’t get to go for a drive, but it seemed fine. This morning I drove it to work and as I went to pull out, it kinda stuttered and the check engine light and reduced performance lights started going. It got up to speed ok, but going up hills it sounded like it was going bahbahbah and the lights started going again. When off throttle the reduced performance goes out, but service engine stays lit. Wires to coils looked ok. Anyone else have this?

 

anything now would be a SWAG but pull codes and post for best support

 

Yeah I figure that too, just thought I'd put it out there

 

Just got to pull codes and it's kinda what I figured, misfires. It has cylinder 7 misfire, and a generic misfire code. I'll have to pull the plugs again and clean off the dielectric grease and see if that helps.

 

Check the coil wire insulation. It becomes brittle and could short.

 

The wires all looked good,I did check that when I was in there. It did much better today. Im wondering if the grease may be heating up and running off the plug

 

I had an issue recently where some fuel cleaner additive didn't agree with the car and crept its way up the threads of my cylinder 7 spark plug, giving a cylinder 7 misfire code and P1316 (excess emissions related to misfire). I figured it was a gasket failure, but after swapping in a fresh plug, the car has been trouble free (knock on wood) for the last 250 or so miles (no additive). I checked the plug yesterday, and it was clean.

The point being, that yeah maybe it could be that the grease is slipping its way down. Might be worth taking out the plugs, cleaning them off, and reinstalling with less or no grease. Then see what happens.

 

I agree. As of yesterday it purred perfectly and ran awesome. My check engine light is still on, but I didn't try clearing the codes. We'll see if it clears itself in the next few trips, if not I'll just clear them and see if they reappear

 

I had the same experience this summer, and the problem was coil packs. It is the heat (and age) that kill them.
Read the fault codes, and note which cylinders that are misfiring. Then move the coils on those cylinders too those that are OK. Start and check if the codes still is one the same cylinders. If they move, you know that it is the coils and nothing else.

 

Yeppers. I appreciate your reply, but this was from 2019, and yes, after driving for a little the light went off. I really think it had to do with too much dielectric grease.