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Home >> Pontiac >> 1991 >> 6000 SE >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Basic Testing - 2.5L/151 TBI In-Line 4 VIN [R] >> Engine Mechanical System >> Compression Check
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Compression Check

Disable the ignition by unplugging power feed connector at ignition coil. Check compression pressure with engine warm, ALL spark plugs removed and throttle valve wide open. Crank engine through 4 compression strokes before reading compression gauge.

COMPRESSION SPECIFICATIONS

Application Specification
Compression Ratio 8:3:1
Compression Pressure 100 psi min.
Max. Variation Between Cylinders Less than 30%
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