TVR common problems and fixes
This page summarises recurring issues reported by owners of Wheeler-era TVRs — the Cerbera, Griffith, Chimaera, Sagaris and Tuscan — together with the parts and checks most often called out. Use it as a starting point for diagnosis, not a substitute for hands-on inspection.
Chassis and bodywork
Section titled “Chassis and bodywork”All of these cars share a tubular steel backbone chassis with GRP bodywork. The chassis is the single most important thing to inspect on any used example.
Rust hotspots
Section titled “Rust hotspots”- Rear outriggers and outrigger bottoms
- Floor pans and jacking points
- Wishbone mountings
- Rear chassis legs
Surface rust on a car over ten years old is normal; flaking, scaling or perforation is structural and needs cutting out and welding. Specialist chassis restorers (for example RT Racing in Sheffield) typically quote in the region of £3,000–£8,000 for a full chassis refurbishment, depending on condition.
Water ingress
Section titled “Water ingress”Leaks are common across the range. Lift the carpets and feel the footwells and boot floor for damp, and check the spare wheel well. Likely culprits:
- Degraded door seals (aftermarket upgrades are available)
- Dashboard bungs and grommets — reseal with silicone
- Boot seal and aperture drains
Brake servo corrosion
Section titled “Brake servo corrosion”The brake servo sits low and forward, directly in the firing line of road spray. Corrosion can perforate the can, let water into the diaphragm, or in extreme cases let the two halves separate. Inspect the underside at every service. See the brake servo cross-reference and replacement pages for replacement options.
Cooling system
Section titled “Cooling system”Overheating affects both Rover V8 and AJP8 cars and has several common causes: tired water pump, sticking thermostat, fan circuit failure or a silted radiator.
| Item | Part / spec | Notes |
|---|---|---|
| Expansion tank | Audi 100/A6 4A0 121 403 | Corner needs trimming to fit |
| Expansion tank cap | VW V443 121 321 | |
| Thermostat (original) | QTH221, 85 °C | |
| Thermostat (alternative) | QTH134, 78 °C | Different housing angle |
Water pump failure is particularly common on the AJP8 and Speed Six — symptoms are overheating, coolant loss and bearing noise from the pump area. Always fit a new thermostat at the same time as a new pump.
Electrical
Section titled “Electrical”Relays and battery
Section titled “Relays and battery”- Fuel pump and ignition relays are the most frequent failures — carry spares.
- TVRs left standing often suffer parasitic battery drain; a trickle charger / conditioner is recommended for garaged cars.
- Alternator output should sit at roughly 14.2–14.4 V with the engine running.
Instruments
Section titled “Instruments”- Speedometers often fail at the magnetic sender on the gearbox.
- Temperature gauges can read optimistically high — verify against an infrared thermometer at the thermostat housing before chasing a cooling fault.
- On the Speed Six, expect a minimum of about 3 bar oil pressure at hot idle.
Central locking parts
Section titled “Central locking parts”| Component | Source / part |
|---|---|
| Lock motor (2-wire) | Maplin YD79L |
| Lock motor (5-wire) | Maplin YD78K |
| Door actuators | Spal |
| Magnetic proximity switches | RS Components 455-3744 |
Fuel system
Section titled “Fuel system”Perished rubber fuel hoses are common and a serious fire risk — replace any suspect hose with modern EFI-rated hose. A persistent fuel smell in the cabin or boot should be investigated immediately.
| Item | Part |
|---|---|
| Fuel filter | Coopers FIG 7003 / Land Rover 928 V8 / Mahle 503330035 |
| Fuel pump (4.2 Cerbera) | Bosch 0 580 254 957 (≈128 l/h at 5 bar) |
Lucas 14CUX (Rover V8 cars)
Section titled “Lucas 14CUX (Rover V8 cars)”The 14CUX ECU and its sensors are responsible for a lot of running complaints on Griffiths, Chimaeras and earlier S-series cars:
- Dry solder joints inside the ECU — reflowing the board often cures intermittent faults.
- Coolant temperature sensor failure — causes poor cold starting and over-fuelling.
- Worn throttle potentiometer — rough or hunting idle.
- Air flow meter failure — persistently rich running.
AJP8 specific
Section titled “AJP8 specific”Coil packs
Section titled “Coil packs”Misfires on the AJP8 are very often down to a failed coil pack. Two are fitted, and the commonly used replacement is the Citroën ZX 1.6i coil (GSF 925PC0090).
Oil leaks
Section titled “Oil leaks”The dry-sump system has several external hoses and unions that can weep — inspect the tank, hoses and fittings. Stick to short (~3,000 mile) oil change intervals.
Speed Six specific
Section titled “Speed Six specific”Camshaft and follower wear
Section titled “Camshaft and follower wear”Early Speed Six engines are notorious for camshaft and finger-follower wear. Revised parts are available. Keep oil changes short and check valve clearances around every 12,000 miles.
Oil pressure
Section titled “Oil pressure”Minimum 3 bar at hot idle. If the oil pressure light flickers, stop the engine immediately — the oil pump drive can fail, and continued running will destroy the engine.
Drivetrain
Section titled “Drivetrain”Rear differential
Section titled “Rear differential”- Pre-1996 cars used GKN units, which can develop a whine.
- 1996-on cars use BTR units, which are stronger and quieter.
- On a test drive, listen for whine on the overrun and check the output seals for oil leaks.
Suspension
Section titled “Suspension”Worn standard bushes give vague, imprecise handling. Common upgrades are Powerflex polyurethane bushes and Nitron adjustable dampers. Inspect the original dampers for oil weeping at the seals.
Safety note
Section titled “Safety note”Fuel, brake, suspension and steering work on these cars is safety-critical. Use manufacturer torque figures and fluid specifications, and if in any doubt have the work checked by a TVR specialist before driving the car.
Compiled from community knowledge shared on TVR Car Club and PistonHeads forums and owner experience — always verify part numbers and specifications against the original manuals before relying on them.