Skip to content
MOTRS

Torana (LJ-LX) / GTR / SLR / A9X

1972-1979 / Coupe / Sedan / Hatchback / Australia

All Torana (LJ-LX) / GTR / SLR / A9X problems All workshop issues
Common Engine, Holden V8 (253ci / 308ci)

Rochester Quadrajet Carburettor Problems

Symptoms

Hesitation off idle (the classic "Q-jet bog"), flooding, hard starting when hot, black smoke, fuel smell.

Cause

The Q-jet's primary metering system is sensitive to wear. The accelerator pump fails, the power piston sticks, the float level drifts, and the needle valve leaks. Modern ethanol-blended fuel attacks old rubber components.

Fix

Rebuild with a quality rebuild kit ($80-150).

Pay particular attention to the float level, an incorrect float level causes 90% of Q-jet running problems.

Alternatively, replace with a Holley 4-barrel or Edelbrock Performer carburettor ($400-800) for simpler tuning and better parts availability.

Cost mentioned in fix
$80-150$400-800

Know something we don't?

Owned a Holden Torana (LJ-LX) / GTR / SLR / A9X? Share your experience with this issue. What worked, what didn't, costs, tips. Help the community.

Submit an update
// More Torana (LJ-LX) / GTR / SLR / A9X problems

Other known issues

Critical Engine, Holden V8 (253ci / 308ci)

Overheating in the Compact Engine Bay

Temperature gauge climbs in traffic or under sustained load. May push coolant out the overflow. Engine pings (detonation) under acceleration.
Common Engine, Holden V8 (253ci / 308ci)

Valve Train Noise (308 V8)

Ticking or clattering from the top of the engine. May vary with RPM.
Common Engine, Holden V8 (253ci / 308ci)

Oil Leaks

Oil on the garage floor, oil smell, oil coating on the underside of the engine.
Common Engine, Holden Six (173ci / 202ci)

Worn Bearings and Low Oil Pressure

Oil pressure drops below 25 psi at idle when hot. Knocking from the bottom end under load.
Common Engine, Holden Six (173ci / 202ci)

Triple Carburettor Synchronisation (XU-1)

Rough idle, uneven running, flat spots, poor throttle response. The engine feels rough and unbalanced.
Minor Engine, Holden Six (173ci / 202ci)

Valve Stem Seal Deterioration

Blue smoke on startup that clears within a minute. May also smoke briefly on deceleration.
View all 19 Torana (LJ-LX) / GTR / SLR / A9X problems