Question 1

Oil Leaks from Cam Seals and Valve Cover Gasket

Accepted Answer

Oil puddles under the front of the engine, sometimes dripping onto the exhaust manifold and smoking. The valve cover gasket weeps oil down the side of the block. The cam seal and valve cover gasket are rubber. After 100,000 miles or 15 years, they harden and leak. It's age, not abuse. Replace the front cam seal (PN 1271500), rear cam seal if accessible, and valve cover gasket (PN 1218940). Use Volvo OEM gaskets, aftermarket ones often leak within a year. While you're in there, do the distributor O-ring and any other accessible seals. Budget 2-4 hours if you're handy.

Question 2

Timing Belt Failure

Accepted Answer

The engine dies instantly, often with a loud slap or clatter. Won't restart. If you're lucky, it just stops; if you're unlucky, bent valves and a destroyed head. The B230F and B230FT are interference engines. If the timing belt snaps, the pistons kiss the valves. Belts are supposed to be changed every 100,000 km or 10 years. Most people ignore the time interval. Preventive replacement every 10 years or 100,000 km, whichever comes first. Use a Gates or OEM belt. Do the tensioner, idler pulley, and water pump at the same time, penny wise, pound foolish not to. If it's already failed, you're looking at head removal, valve replacement, and possibly piston damage. Engine-out job.

Question 3

Flame Trap Clogging (PCV System)

Accepted Answer

Rough idle, oil leaks from every seal, oil in the intake tract, sometimes a whistling noise from the crankcase breather. The flame trap (a little plastic box under the intake manifold) clogs with oil sludge. This blocks crankcase ventilation, which pressurises the crankcase and blows oil past every seal. Volvo's fancy anti-backfire device becomes an oil-leak generator. Remove the intake manifold (easier than it sounds), unscrew the flame trap, and replace it. Part is cheap. Clean out the PCV hoses while you're there. Some people fit an external oil catch can to avoid future issues.

Question 4

Oil Consumption (Turbo Models)

Accepted Answer

Blue smoke on startup or under boost. Oil level drops a quart every 500-1000 miles. Worn turbo seals or valve stem seals. The turbo spins at 100,000+ rpm and relies on tight clearances; age and heat degrade the seals. Valve stem seals harden with age. Turbo rebuild or replacement if it's the turbo (PN varies by year; expect £300-600 for a rebuilt unit). Valve stem seals can be replaced with the head on the car using a spring compressor and air pressure, but it's fiddly. Budget a weekend.

Question 5

Radiator and Heater Core Leaks

Accepted Answer

Sweet smell in the cabin, puddles of coolant under the car, overheating, fogged windscreen that won't clear. Plastic end tanks on the radiator crack with age. The heater core (buried in the dashboard) corrodes and leaks. Both are 30+ years old now. Radiator is straightforward, two hours, new radiator, bleed the system. Heater core is a dashboard-out job, which is as miserable as it sounds. Budget a full day and possibly some swearing. Use OEM Volvo or Nissens parts, cheap eBay radiators fail within a year.

Question 6

Expansion Tank Cracking

Accepted Answer

Coolant level drops, small puddle under the passenger side of the engine bay, sometimes a pressure release hiss. The plastic expansion tank gets brittle after decades of heat cycles. It cracks at the seams or around the cap. Replace the tank. It's a 20-minute job. Don't bother trying to plastic-weld it.

Question 7

Thermostat Sticking

Accepted Answer

Engine takes forever to warm up, heater blows lukewarm air, or (if stuck closed) the engine overheats. The thermostat wax pellet degrades. Volvos run a relatively cool 90°C, and a worn thermostat often sticks open. New thermostat (PN 271500 for non-turbo, others vary). Use OEM. It's a 30-minute job: drain coolant, two bolts, swap, refill, bleed.

Question 8

Fuel Pump Failure

Accepted Answer

Car cranks but won't start, or starts then dies. Sometimes surges or cuts out at speed. You might hear the pump whirring loudly or not at all when you turn the key. In-tank fuel pumps wear out. They're lubricated and cooled by fuel, so running the tank near empty kills them faster. 150,000 miles is typical lifespan. Drop the tank, replace the pump. Use Bosch 0580254044 or Volvo OEM. Budget 2-3 hours under the car. Some people fit an external pump as a bypass, but it's not ideal long-term.

Question 9

Fuel Injector Seals Leaking

Accepted Answer

Rough idle, fuel smell in the engine bay, visible wetness around the injectors, hard starting when hot. The rubber O-rings on the injectors harden and crack after 20+ years. Pull the injectors, replace the O-rings and crush washers. Use genuine Volvo or Bosch seals, pattern parts often swell or leak. Clean the injectors while they're out. An hour's work.

Question 10

Fuel Pressure Regulator Diaphragm Failure

Accepted Answer

Rough idle, black smoke, fuel smell in the cabin, petrol in the vacuum line or intake manifold. The diaphragm inside the FPR splits, allowing fuel to be sucked into the intake via the vacuum line. Replace the FPR (Delphi or OEM, around £40). It's on the fuel rail, one vacuum line, two bolts. 15 minutes.

Question 11

Alternator Failure

Accepted Answer

Battery light on, dimming headlights, dead battery, car dies while driving. Brushes wear out, voltage regulator fails, or bearings seize. These alternators are good for 150,000 miles but no more. Replace or rebuild the alternator (Bosch rebuild around £100-150). It's accessible, top engine mount, belt, two bolts. An hour if you've done it before.

Question 12

Ignition Amplifier Failure

Accepted Answer

Sudden stalling, no spark, won't restart. Usually happens when hot. The ignition amplifier (a small box bolted to the inner wing) overheats and fails. It's a known weak point. Replace the amplifier. Carry a spare, they fail without warning. Some people relocate it away from engine heat.

Question 13

Fusebox Corrosion

Accepted Answer

Intermittent electrical faults, wipers stop, indicators don't work, gauges go dead. Usually starts in damp weather. The fusebox (under the dashboard, driver's side) corrodes from water ingress via the windscreen or door seals. Volvo used cheap tin-plated contacts that corrode easily. Pull every fuse, clean the contacts with emery cloth and contact cleaner, apply dielectric grease. Check for water leaks at the windscreen seal. Some people replace the whole fusebox with a modern blade-fuse unit.

Question 14

Intermittent Instrument Cluster Failures

Accepted Answer

Speedometer stops, fuel gauge reads full/empty at random, warning lights come on for no reason, odometer stops advancing. Corroded circuit board traces or failed solder joints in the cluster. Very common after 200,000 miles. Remove the cluster (four screws), inspect the back for cracked solder joints, resolder. If traces are corroded, you'll need to repair them or replace the cluster.

Question 15

AW71/AW72 Automatic Transmission Slipping or Delayed Engagement

Accepted Answer

Flare on the 1-2 or 2-3 shift (engine revs but no acceleration), delayed engagement into Drive or Reverse, harsh shifts. Volvo claimed "lifetime" transmission fluid, which is nonsense. After 100,000 miles the fluid is cooked and clutches start slipping. Change the transmission fluid. Drain and refill at the pan (around 4 litres), or better yet, drop the pan and replace the filter. Use Dexron III or Volvo-approved ATF. Do NOT flush it if it's never been changed, you'll dislodge crud and block the valve body. If it's already slipping badly, a rebuild is £1000-2000.

Question 16

Manual Transmission Shift Linkage Wear

Accepted Answer

Sloppy, vague shifts, hard to find gears, grinding when cold. The shift linkage bushings wear out. There are several in the system, all plastic. Replace all the bushings in the shift rod and the selector mechanism under the car. It's fiddly but cheap. IPD sells a kit for around £30.

Question 17

Propshaft Centre Bearing (Carrier Bearing) Failure

Accepted Answer

Vibration at speed (especially 50-70 mph), clunking under acceleration, sometimes a droning noise. The rubber mount for the centre bearing hardens and splits. The bearing itself can also fail. Replace the centre bearing and mount. It's under the car, two bolts. Takes an hour. Use OEM Volvo or FAG bearings, cheap ones fail quickly.

Question 18

Front Strut Top Mount Failure

Accepted Answer

Clonking over bumps, steering doesn't return to centre, negative camber on one side, tyre wear on the inside edge. The rubber in the top mount degrades, or the bearing in the mount seizes. Very common after 100,000 miles. Replace both strut top mounts. If you're doing it, replace the struts too (Bilstein Touring are the sweet spot for ride quality). Use IPD heavy-duty poly mounts or OEM. Budget half a day.

Question 19

Ball Joints and Control Arm Bushings

Accepted Answer

Clonking over bumps, wandering at speed, uneven tyre wear, steering feels vague. Ball joints and bushings wear out. Volvo used pressed-in bushings that can't be replaced separately, so you often have to replace the whole control arm. Replace lower control arms (with ball joints and bushings included). Aftermarket arms are cheaper but often don't last. Use Meyle HD or OEM Volvo. You'll need a press or a big hammer and a socket to get the old bushings out if you're replacing them separately.

Question 20

Steering Rack Leaks

Accepted Answer

Power steering fluid puddle under the car, whining noise when turning, heavy steering. The seals in the rack wear out after 150,000 miles. Overfilling the system or running it low accelerates wear. Rebuild the rack (£200-300 in parts, needs a specialist) or replace it with a reman unit (£400-600). It's a half-day job with the car on a lift.

Question 21

Rear Axle Bushings

Accepted Answer

The rear end feels loose, especially under braking or cornering. You might hear clunking or feel the tail wagging. The bushings in the rear trailing arms and Panhard rod wear out. They're rubber and they're 30 years old. Replace all the rear bushings. IPD sells poly bushing kits which are stiffer and last forever, but they transmit more noise. OEM rubber is quieter but will need replacing again in 50,000 miles. Budget a day to do the lot.

Question 22

Rear Caliper Seizing

Accepted Answer

Handbrake sticks on, one rear wheel gets hot, pulling to one side, burning smell after driving. The rear calipers have an integrated handbrake mechanism that corrodes if the handbrake isn't used regularly. Volvo blokes in damp climates see this all the time. Rebuild the rear calipers (seal kits are cheap) or replace them with reman units. While you're in there, replace the brake hoses, they're probably original and will fail soon.

Question 23

Brake Accumulator Failure (ABS Models)

Accepted Answer

ABS light on, hard brake pedal, pump runs constantly or not at all. The accumulator (a pressure sphere in the ABS system) loses its nitrogen charge. It's a wear item, but many are still on their original unit. Replace the accumulator. It's expensive (£300-500) and a pain to bleed properly. Some people delete the ABS and fit a conventional master cylinder instead.

Question 24

Rear Wheel Arches and Sills

Accepted Answer

Rust blisters, holes, structural rot behind the plastic trim. Water and mud collect behind the wheel arch liners and rot the metal from the inside out. The sills also trap moisture.

Question 25

Front Wings and Battery Tray

Accepted Answer

Rust at the bottom of the wings, especially where they meet the sills. Battery tray corrodes and the battery can drop through. Salt, moisture, and a lack of drainage. The battery tray suffers from acid leaks.

Question 26

Heater Blower Motor Failure

Accepted Answer

No air from the vents, or the blower only works on one speed. Blower motor brushes wear out, or the resistor pack (which controls fan speed) burns out. Replace the blower motor (under the passenger side dashboard, annoying to reach) or the resistor pack (easier, it's behind the glove box).

Question 27

Window Regulators and Switches

Accepted Answer

Windows move slowly, stop halfway, or don't move at all. Sometimes the switch itself feels dead. Window regulators wear out, or the switches corrode internally. Replace the window regulator (common failure) or clean/replace the switch. Regulators are about £50-80. Switches can often be cleaned with contact cleaner.

740 / 760

740 / 760 known problems