FWD DeVille 1985-2005, Fleetwood, and 60 Special
I live in Everett, WA
I did a Head Gasket Block test and the Blue test fluid turned yellowish green.
White smoke emitting from exhaust. Turning on, the car rumbles/shakes a little, then subsides.
Codes shown on screen (old) P0155, P0446, and (new), as of 2 days ago, P0300.
The 1st 2 shown...