XJ6 (Series I-III)

1968-1992 / Sedan / United Kingdom

All XJ6 (Series I-III) problems All workshop issues

Common Electrical

Instrument gauge failures

Symptoms

Temperature gauge, fuel gauge, or oil pressure gauge reads incorrectly or not at all. Warning lights illuminate randomly.

Cause

The Smiths instruments use voltage stabilisers and sender units that fail with age. The printed circuit board behind the instrument cluster develops cracks. Earth connections corrode.

Fix

Check the voltage stabiliser first (it regulates the supply to the gauges).

Test sender units.

Inspect and repair the printed circuit board.

Specialist instrument repairers can overhaul the complete cluster.

Budget $300-800 AUD.

Cost mentioned in fix

Budget $300-800

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// More XJ6 (Series I-III) problems

Other known issues

Common Electrical

Lucas ignition failure (Series 1 and 2)

Misfiring, rough running, hard starting, random stalling. The car runs on five cylinders or fewer.

Common Electrical

Alternator and charging system failure

Battery goes flat, warning light stays on, instruments dim at idle, car won't start.

Minor Electrical

Electric window failure

Windows won't go up or down, move slowly, or stop halfway.

Minor Electrical

Central locking and door lock failures

Central locking won't operate, or works on some doors but not others. Key won't turn in the door lock.

Minor Bodywork and Rust

Sill corrosion (structural)

Outer sills bubble and perforate. Inner sills rot silently behind trim. The car's rigidity decreases, doors sag, gaps become uneven, and the body flexes over bumps.

Minor Bodywork and Rust

Floor pan corrosion

Floor pans rot from underneath or from above (water sitting under carpets). In severe cases, you can see the road through the floor.

View all 28 XJ6 (Series I-III) problems