My customer pool and willingness to work on older, even classic vehicles means it takes me a while to get much hands-on time with cars of about 10 years of age or newer. Even though I specialize in 70s/80s Mercedes and currently have an air cooled Beetle, FJ40, and BMW E28 at the shop I shy away from most late 90's-up European cars. Two jobs in the last two weeks just give me more resolve to keep driving the rigs in my sig, even if it means hunting harder for parts and factoring in some down time for cosmetic maintenance and simply, age-related repair.
2015 VW Passat TDI, 185K. Front-rearward LCA bushings shot, and replaced timing belt (first time, yikes). All seems fine until three days later when it goes into limp mode on his way to work. After borrowing a scan tool that can actually talk to the VW, I find both the DPF pressure sensors melted into a glob – connectors to the main engine harness included. Also misfire codes showing the exact same odometer reading and identical RPM across all four cylinders. The moment I googled the right keywords I found the rabbit hole with tons of identical events soon after timing belt service - apparently the sensors get so brittle that the slight movement required to move its hose aside to remove the timing cover, cracks it, which allows heat from the DPF to travel up to the sensor and destroy it. Theory on the simultaneous misfires is that the melting sensors shorted a common circuit that shut the whole thing down momentarily. Sensors are $200+ each from the dealer (in stock at the cost of a 1.5 0hr. drive) ~$160 online for genuine, or ~$200 for both (aftermarket) through parts house or fast-ish shipping online. Customer opts to cheap out and wait for shipping.
2016 Hyundai Tucson 1.6 T-GDI, 76K miles, oil changed 1500 mi. ago and it's already 2.5+ qts. low. Customer is from out of town, about 90 miles from arriving here it developed a dead miss so they had it towed the rest of the way, called me on recommendation of family here. Disconnecting #4 coil makes zero difference, swap coils and plugs to no avail, then formulate the theory that one injector has failed, which seems common according to the Interwebs. Before paying for fast shipping on injectors and related parts I do a compression check which reveals exactly 0 compression on that hole. Can't find any damage to the piston or cylinder with a bore scope, just a ton of gas. Add oil, still zero compression. Add compressed air and can still freely rotate the engine while the compressed air flows out the other spark plug holes on intervals as the respective valves open. Remove valve cover to check for broken valve spring, etc., but find nothing. Then turn to the interwebs to find many occurrences of catastrophically burnt valves on this family of engines at even lower mileage, which all the symptoms align with. Call owner to break the news that there's no way this car is what's taking them 600 mi. back home this weekend.
Close up shop on Christmas eve-evening, crank up my 220K-mile Mercedes 300D, drive home and park next to the 376K-mile CRV, behind the 331K-mile Suburban. Life could be better but at least I'm not stranded by parts that were never designed to last in the first place.
2015 VW Passat TDI, 185K. Front-rearward LCA bushings shot, and replaced timing belt (first time, yikes). All seems fine until three days later when it goes into limp mode on his way to work. After borrowing a scan tool that can actually talk to the VW, I find both the DPF pressure sensors melted into a glob – connectors to the main engine harness included. Also misfire codes showing the exact same odometer reading and identical RPM across all four cylinders. The moment I googled the right keywords I found the rabbit hole with tons of identical events soon after timing belt service - apparently the sensors get so brittle that the slight movement required to move its hose aside to remove the timing cover, cracks it, which allows heat from the DPF to travel up to the sensor and destroy it. Theory on the simultaneous misfires is that the melting sensors shorted a common circuit that shut the whole thing down momentarily. Sensors are $200+ each from the dealer (in stock at the cost of a 1.5 0hr. drive) ~$160 online for genuine, or ~$200 for both (aftermarket) through parts house or fast-ish shipping online. Customer opts to cheap out and wait for shipping.
2016 Hyundai Tucson 1.6 T-GDI, 76K miles, oil changed 1500 mi. ago and it's already 2.5+ qts. low. Customer is from out of town, about 90 miles from arriving here it developed a dead miss so they had it towed the rest of the way, called me on recommendation of family here. Disconnecting #4 coil makes zero difference, swap coils and plugs to no avail, then formulate the theory that one injector has failed, which seems common according to the Interwebs. Before paying for fast shipping on injectors and related parts I do a compression check which reveals exactly 0 compression on that hole. Can't find any damage to the piston or cylinder with a bore scope, just a ton of gas. Add oil, still zero compression. Add compressed air and can still freely rotate the engine while the compressed air flows out the other spark plug holes on intervals as the respective valves open. Remove valve cover to check for broken valve spring, etc., but find nothing. Then turn to the interwebs to find many occurrences of catastrophically burnt valves on this family of engines at even lower mileage, which all the symptoms align with. Call owner to break the news that there's no way this car is what's taking them 600 mi. back home this weekend.
Close up shop on Christmas eve-evening, crank up my 220K-mile Mercedes 300D, drive home and park next to the 376K-mile CRV, behind the 331K-mile Suburban. Life could be better but at least I'm not stranded by parts that were never designed to last in the first place.