When trying to solve a misfire in my mothers 2012 traverse, I decided to clean the fuel injector ports with carb cleaner when replacing the injectors, as small amounts of residual walnut shells had fallen in. I removed the spark plugs and FSCM fuse, and cranked the engine, to prevent hydro locking, and it caught fire. The fire was on the foam between the heads, so putting it out the normal way (with rags) did not work, and as the fire spread to the insilation on the fire wall, I grabbed our only fire extinguisher, assuming it would spray foam, only to find the entire engine bay, and half the garage covered in dust. I tried using a shop vac, and household vacuum cleaner, but was unable to get all of it. Time to call it a day...

The label on the fire extinguisher says it contains
"FORLAY* monoammonium phosphate dry chemical. HMIS 1-0-0. Ammonium sulphate, muscovite mica, magnesium aluminum silicate."

Will this destroy the valves and/or rings? Could Enough of the powder be blown out with an air compressor to get it to run for more than a week before it blows up?

Any other ideas that do not involve YET ANOTHER rebuild on this engine?

 

What's the powder feel like rubbing it in your fingers? Rough. Ouch....Smooth. OK

 

It felt like powder. I used a combination of compressed air, and the shop vac to remove as much of the powder as possible, turning it by hand to open the intake valves one at a time while suckinf at the intake port with the shop vac, and blowing air in the fuel injector holes at the same time. It runs and drives normally, other than the cylinder 3 misfire, which changing the injector did not fix...

 

Compression?