Isuzu — Compression pressure inspection
Testing & diagnosis · Engine cylinder
From a Isuzu service manual — check it applies to your exact model before use.
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Before you start
- Use fully charged batteries to keep engine speed at 200 rpm or more
Procedure
- Warm up engine and disconnect negative battery cable
- Remove all glow plugs
- Turn on starter to emit foreign matter within cylinders
- Install adapter and gauge of compression gauge special tool
- Crank engine and inspect each cylinder one by one
- Clear ECM memory after measurement
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compression pressure standard 2.84 − 3.24 MPa (412 − 469 psi)/200 rpm
- Limit 1.96 MPa (284 psi)
- Differences among cylinders 294 kPa (43 psi)
Source: Isuzu service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.