Mechanical Inspection: Compression
Check engine mechanical condition using a compression gauge, vacuum gauge or engine analyzer. See engine analyzer manual for specific instructions.
WARNING:
DO NOT
use ignition switch during compression tests on fuel injected vehicles. Use a remote starter to crank engine. Fuel injectors on many models are triggered by ignition switch during cranking mode, which can create a fire hazard or contaminate engine oiling system.
COMPRESSION SPECIFICATIONS
| Application | Specification | ||||
|---|---|---|---|---|---|
| Compression Ratio | 10.5:1 | ||||
| Compression Pressure (Minimum) | |||||
| 850 (B5254S Engine) | |||||
| Motronic 4.3 | 170-199 psi (12-14 kg/cm2 ) | ||||
| Motronic 4.4 | 184-219 psi (13-15 kg/cm2 ) | ||||
| 850 R (B5254FT Engine) | (1) | ||||
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