Previous list of items checked on F355 to resolve ‘chuggs’:
Additional items checked on the F355 to resolve ‘chuggs’:
4. Fuel pressure test
Carried out fuel pressure measurements at both rails. 3.8bar at Bank 1 and 3.7 bar at Bank 2. Values are acceptable and just slightly over the 3.4+/1 0.2 spec.
5. Thermal tests
Exhaust Bank 1
Exhaust Bank 2
Measured temperature of exhaust system during warm up and once operating temperature reached. No major discrepancies between individual cylinders of the same bank.
Found on first test Bank 2 headers slightly cooler than Bank 1 however during later testing found Bank 1 at approx. 400degC and Bank 2 at approx. 450degC.
Inlet bank 1
Inlet bank 2
Measured temps of inlet and outlet and found Bank 2 cat slightly cooler during warm up than Bank 1
Outlet cat bank 1
Outlet cat bank 2
and outlet temps were consistent.
6. Fuel pressure at operating temperature
Switched off engine after reaching operating temperature and observed over 30 minute period and found the values are out of spec for allowable pressure loss over 1 hour 2.7 +/- 0.3bar (Note: Non return valve spec is 1.5bar).
7. After half hour period started engine and confirmed an extended crank period.
8. Removed vacuum lines from fuel pressure regulators at the rails. No fuel evident at vacuum lines. Used vacuum generator on the diaphragm and then monitored for vacuum loss. No evidence of loss.
Updated tracking files:
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