Reference: Ginetta G40 Known Issues

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These are from my experience with a G40 GRDC / Cup car, and not a criticism, as these are excellent track cars and can take a lot of hard use. Brakes take the most maintenance and possibly replacement. Tyres last really well. The engine is strong, with occasional electronic / control glitches. Bodywork is sometimes an issue with mountings, catches, etc.

Known weaknesses

Exhaust movement (over time, the middle clamp below the passenger door allows movement of the system backwards, into the left-rear tyre)
Throttle sticking when engine hot e.g. in traffic - if this happens regularly, check the throttle position sensor (TPS) on the front end of the throttle body / linkage
Alternator weakness (bearing breakdown)
Alternator upper mounting bolt or bracket breakages. There is a replacement part for this bracket made of nylon.
Wiring around the alternator - cable corrosion and breakages, possibly because they are too short or un-sheathed
Fuse changes very difficult (old dashboard)
Fuel gauge is not accurate
Turn indicators stop working - relay comes loose, push back in (new dashboard)
Turn indicators stop working at front (fast flash on dashboard) - bulb mounting comes loose in headlight pod
Do not use a plug-in 12V compressor for inflating tyres; it will blow a 5A fuse and stop the car starting
Brake bleed screw on rear calipers seize up, so don't over-tighten
Factory-supplied rear-view mirror falls off, if stored in non-heated garage or in direct sunlight
Windscreen will crack easily, as the fit seems to be under a lot of tension and needs a release (caused by gravel strikes on track or even jacking up the car unevenly)
Door hinge mountings break down and door drops out of line. The mounting for the lower hinge needs strengthening.
Starter motor locks after a track session (when hot) or when battery is low (during storage). I'm not sure if this is a solenoid issue or the starter motor itself, but so far, it has resolved itself on my car, by repeated pushing of the start button.
Differential mounting bolts come loose (need regular tightening - 10 mm hexagon key to approx 25 n/m)
Rear wishbone joints at the wheel side have worn on my G40 after about 5,000 miles.

See also