![]() It can be severely damaging since it could potentially create a hole through the engine block or even seize the motor. The rod bearings fail, they can result in rods knocking against the cylinder walls. The problem is quite common if you don’t follow the recommended oil change schedule or intervals. The rod bearings are usually the first ones to be affected if you experience oil flow issues. Rod bearings connect the connecting rods to the crankshaft and as vital as it is, it usually takes a bit of abuse. On November 15, 2018, there was a lawsuit filed against Subaru for the ringland failure that can cause sudden engine failures from piston detonation. If a rebuild is not an option, you might need to replace the engine. You can correct the issue by rebuilding it with a new piston and the cylinder walls will have to be machined. The motor needs to be opened to determine the extent of the damage. When you experience this problem, it is best that you have your car inspected for proper diagnosis. Smoke coming from your engine can be caused by oil that blowbied the rings and enters into the combustion chambers. The piston won’t be able to seal the combustion chamber properly so you will lose cylinder compression and it could result in power loss. It won’t always happen but it is possible whenever there is anything that contacts the cylinder wall. The knocking sound coming from the engine can be caused by losing a chunk of the piston. Symptoms of this Subaru turbo problem includes engine knocking or ticking, loss of compression, power loss, and smoke coming from your exhaust. You could end up losing some, if not all, compression on the affected cylinder and can potentially damage cylinder walls. ![]() When this happens, it can result in a serious problem. The cracks won’t become a problem if it stays small but when they start to expand, you will lose a portion off the piston, ring, or ringlands. A minor crack won’t be a problem and you won’t probably notice it unless the engine is disassembled. Ringlands – the areas between the three piston rings, can crack and they are usually the beginning of piston problems. The Subaru EJ255 is a 2.5L flat four engine. This issue is said to be common on Subaru EJ255 turbo engines. When you experience this problem, it is important that you have your car checked as soon as possible since ignoring a misfire can lead to a much bigger problem that can be too expensive to fix. Tight valve clearance can develop over time because of heat cycles. If the problem is caused by a tight valve, it can cause burnt valves. This issue can be caused by vacuum or boost leaks, faulty ringland on the pistons, or tight exhaust valve clearances. Misfiring is also one of the Subaru turbo problems. When the proper oil change maintenance is not done, sludge and deposits caused by oil deterioration will clog the oil passages and it could cause excessive wear due to lack of lubrication. Proper oil change maintenance is also required which is every 3,750 miles. To prevent this problem, the oil supply bolts need to be checked and replaced when needed every 60,000 miles or more depending on how the car was used. When this becomes restricted, the oil will have trouble getting to the turbo and it could cause it to overheat and other engine problems. The Subaru has a union screw or bolt which is a filter installed in the turbo’s oil supply line. When it goes into bypass mode, the filter in the bolt will tend to become restricted. There will come a point that the filter becomes clogged with matter and will go into bypass mode. The oil filter is small and no matter what kind of oil you put, it can only filter so much. The problem is said to be caused by the oil filter being used by Subaru. There have been some reports about certain Subaru turbo problems that can cause oil starvation. Here are some of the common Subaru turbo problems. Do Subarus have engine problems? Yes, they have and today we will discuss the common Subaru turbo problems. ![]() Subaru turbo engines are built to be tough and solid but they are still prone to some Subaru turbo problems.
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