 |
Normal
Reading
Needle between 15 and 22 inches on a first
generation Probe or between 17.7 and 22 inches
on a second generation Probe. Needle holding
steady. |
 |
Normal
Reading During Rapid Acceleration
When the engine is rapidly accelerated, the
needle will drop to a low reading, but not zero. |
 |
Normal
Reading During Rapid Deceleration
When the throttle is suddenly released during
acceleration, the needle will jump to a higher
then normal reading. |
 |
Worn Rings
or Diluted Oil
When the engine is rapidly accelerated, the
needle will drop to 0 inches. When the throttle
is released, the needle will jump to a reading
above 22 inches. |
 |
Sticking
Valve or Valves
When the needle remains steady within the normal
range, but occasionally drops about 4 inches
very quickly, then back to normal. |
|
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