White deposits in exhaust port, after going lean in boost.

[henrysan]

Took the car out for short drive and decided to get into boost. Car stumbled and loss power once full boost was reached so I let off, so about a second or less of it stumbling. Was not logging and did not have time to look over at WB. After I got home and hooked up the laptop I see that voltage drops to 11.5 (normally 13.7-14 at idle) once the car is running, Looks like the alternator died. Had to remove jmf manifold so I could remove the alternator and found the deposits in #4 exhaust port. The plugs look ok I think. Is it melted aluminum? What is this stuff?

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[SasaniFab]

The white residue is a biproduct of combustion and is normal. What type of fuel are you running? I cant tell by the picture what the plug looks like. The car wasnt knocking?

 

[henrysan]

Knock is set to flash cel at 1 degree timing pull, but I run e85 so it probably would not knock anyway, and did not light up cel during the very short pull.

 

[gsxeclipse102]

White is normal. The valve on the right looks wet though. Valve seal may be leaking

 

[henrysan]

Thanks for replys. I was worried maybe it was melted piston/head particles. I also found other pics on google that looked almost identical and it was also said to be fuel additive related, and normal.