2011 Ford E350 v10. 200k. I had a ping that was greatly reduced after a plug change but was still there at high rpm above 3500 and higher speeds 70+ at wot. Did the Seafoam treatment and it reduced it to high rpm high speed with 7k towing I can hear it. Then after a couple of weeks it came back. I installed mikes 5 star tune and it only does it at high rpm high speed with towing again . Checked cats, replaced purge valve solenoid, fuel pressure, maf. No codes ever. For about a week the truck was hard starting and ran rough. Then went away. Mechanic said fuel injector leaking. Then it smoked on startup for a few days then stopped. Also said maybe leaky fuel injector.

Could a fuel injector be causing this. The ping comes from the passenger side of motor. Has anyone done a fuel injector cleaning or decarbonizing treatment? Where would a good place go and does it work. Instead of searching for a specific injector.

 

What color was the smoke on startup? Black? If so, that's fuel. If it's fuel, it's an injector. Be careful! A leaky injector that lets too much fuel into the cylinder can hydro lock the engine, breaking all sorts of things.

 

The color was white. It also ran rough for 30 seconds then smoothed out. It only did it twice a month ago and hasn’t done it since. I was trying to figure out if that was related to my pinging because I read a clogged injector or poor spray pattern can do it too

 

White is water. Now, if the cat is good and doing it's job, running rich will produce more water, but it's cold so the cat isn't really working. I'd start wondering if you have a head gasket leak. Pull the passenger-side plugs and see what they look like.