To avoid the problem, it is necessary to screw the spark plugs carefully and only on cold engine.
It may be solved by changing head for the new. Later coolant may start leaking through them, what causes misfire on your MR20DE.
Usually it happens if the spark plugs are screwed very tight, the cracks at the screw appear. The one of the most unpleasant is head cracks. There are also some other problems, which may happen sometimes. Just change the belt for the new and your engine will not make the noise any more. You should not be afraid of it, alternator belt is the reason. It happens quite often, when the engine is cold. You should check its state, perhaps it must be changed.ģ. Just change the timing chain and all will be settled.Īlso dirty throttle body may cause this problem. Along with rough idle the car is losing its power. It mainly happens because of timing chain stretching. You need to run diagnostics, it may need overhaul.Ģ. More likely soot deposited in cylinder or oil rings failed. Nissan MR20DE engine problems and malfunctionsġ. Since 2010 MR20DD with direct injection system has appeared.Īlso Nissan MR series include such engines as MR16DDT, MR18DE/MRA8DE, M9R. But if you enjoy active driving, for you it certainly will not be enough. The engineers also tried to reduce friction thanks to brilliant mirror-like polishing of crankshaft and camshaft journals, and also thanks to utterly true shape of the cylinders.Īll that made MR20DE engine quite convenient for secure driving in the city. Exhaust system has straight design, what lets carrying exhaust fumes effectively.Īlso MR20DE has EGR system, which returns a part of the exhaust gas for its repeated combustion and improves the ecological index. Intake manifold has long runners, it improves low- and mid-range torque.
The intake and exhaust systems are made in special way to create the lowest resistance. MR20DE was not equipped with any hydraulic lifters, and so if ticking noise has appeared, you need to regulate valve clearance. Aluminium cylinder head has two camshafts and continuous variable valve timing system CVTC on the intake side. New aluminium cylinder block with offset crankshaft was developed for the engine, Piston stroke is 90.1 mm, and cylinder diameter in this engine is 84 mm. This engine was designed both by Nissan and Renault. Nissan MR20DE engine reliability, problems and repair Normal engine operating temperature, ☌ (F)
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