Replaced the spark plugs on my 2014 Maserati Ghibli 2 days ago. Used OEM plugs(Maserati specific NGKs). Checked the gap and they were all between 0.50-0.55mm. Original ones I pulled out were also the same. Factory spec calls for 0.5-0.6mm gap.
Car was running fine before the change. After installation, I got rough idle when I first started. Idle jumped 200-300rpm. Revved it alittle, sorted itself out. Idle is steady now. But on a cold start It'll misfire alittle, shake. Goes away once warmed up, but every now and then I'll feel and hear a misfire again, even at full operating temp. Exhaust also smells like it's burning rich, BUT car drives fine. It's just the idle.
I'm not getting a CEL and everything was put back together correctly. Plugs were torqued to spec. The only thing I might have missed was putting dielectric grease on the rubber boots of the coil packs, since I didn't have any on hand.
Would pulling the plugs and checking them atleast pin point the misfire? Is there anything I should look for?
Car was running fine before the change. After installation, I got rough idle when I first started. Idle jumped 200-300rpm. Revved it alittle, sorted itself out. Idle is steady now. But on a cold start It'll misfire alittle, shake. Goes away once warmed up, but every now and then I'll feel and hear a misfire again, even at full operating temp. Exhaust also smells like it's burning rich, BUT car drives fine. It's just the idle.
I'm not getting a CEL and everything was put back together correctly. Plugs were torqued to spec. The only thing I might have missed was putting dielectric grease on the rubber boots of the coil packs, since I didn't have any on hand.
Would pulling the plugs and checking them atleast pin point the misfire? Is there anything I should look for?