CONTENTS
SMOKE

GRAYISH-BLUE SMOKE

CONDITION(S)

• GRAYISH-BLUE SMOKE FROM TAILPIPE
• APPARENT ON FIRST STARTING ENGINE OR DURING ACCELERATION
• OCCURS ON RESTART OR AFTER CAR REMAINS OVERNIGHT
• EVENTUALLY BLUE SMOKE PRESENT AT ALL TIMES

POTENTIAL CAUSE(S)

CHECK THESE FIRST:

1. WORN PISTON RINGS OR CYLINDERS
Change oil and filter; use heavy weight oil.
Have pistons or cylinders professionally repaired.

2. WORN VALVE SEALS
Have valve seals professionally replaced.

CHECK THESE NEXT:

3. CLOGGED CYLINDER HEAD OIL DRAIN HOLES
Remove engine sludge.

4. LEAKING VACUUM MODULATOR (ENGINE BURNING AUTOMATIC TRANSMISSION FLUID); CONFIRMED IF AUTOMATIC TRANSMISSION FLUID IS ALWAYS LOW
Have vacuum modulator professionally replaced.

CHECK THIS LAST:

5. BROKEN MECHANICAL FUEL PUMP DIAPHRAGM
Have mechanical fuel pump professionally replaced.

CONTENTS
BLACK SMOKE
WHITE SMOKE