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MEDIUM / HEAVY RIGID
Isuzu FSR / FVZ
Isuzu medium / heavy rigid trucks are reliable workhorses. Injector knock, turbo seals and glow plug circuits are the usual call-outs.
SYMPTOMS
What you'll notice
Tell-tale signs the Isuzu FSR / FVZ is asking for attention.
- Loud metallic knock under load
- Blue smoke on start-up and oil consumption
- Hard cold start, especially in winter mornings
- Black smoke and slow throttle response
DIAGNOSTICS
How we find the fault
- 1
G-IDSS diagnostic scan
Pull engine ECU faults and run actuator tests.
- 2
Injector balance / leak-off
Compare per-cylinder fuel correction and back-leak volume.
- 3
Turbo oil seal inspection
Boot off, shaft play check, intake tract oil residue assessment.
- 4
Glow circuit test
Resistance test each plug and verify relay command on ignition.
TYPICAL REPAIRS
What we fix on the Isuzu FSR / FVZ
Injector replacement & coding
Fit OEM injectors, code in G-IDSS, road-test under load.
Turbo overhaul / replace
Replace turbo cartridge or unit, fit new oil feed and return lines.
Glow plug set & relay
Replace full plug set and faulty relay; verify cold-start performance.
Common faults at a glance
Quick reference of the issues we see most on this platform.
- Fuel injector knock
- Turbo oil seal leaks
- Glow plug failures