Fa20 vs ej20 reliability My 04 WRX has over 200,000 on the original engine and transmission. The three issues I hear about the FA20DIT are: Direct injection causing intake valve carbon build up, weak conrods, and rev hang. The problem with a camshaft gear, which leads to a loss of oil pressure. The FA20 has a higher compression ratio and uses Toyota's direct fuel In this article, we will break down the differences between the long-reigning Subaru EJ series engine and its modern successor, the FA series engine. Let’s get started! Subaru EJ20 2. This two-liter version laid down the history of the EJ series. For many enthusiasts, the burgeoning questioning over the past few years has been: which is better, the FA20 or the EJ257? This guide will cover everything you need to know about both engines, and will look at design, reliability, and most importantly, performance and upgrades. With that said, in terms of reliability, durability, power gain, tuning potential and overall tuner friendliness(I hope this all makes sense), which is the better engine? The 2. -What's generally more reliable out of the FA20 and EJ25? Also, what's more fun? -I have heard the FA20 is great for low end torque but lacks high end boost and has the power flatten out at 4000 RPM. EJ20 vs FA20: Which engine is more tuner friendly? I hear that the EJ20 is getting discontinued and future WRXs and STIs will be powered by the FA20F engine. We have 2 model years of FA20DIT (not including Forester which probably isn't driven hard by most), and like 12 or more of EJ, so obviously more complaints on the EJ. I agree. I have two 04’s. 2. 0-liter four-cylinder, gasoline boxer engine that firstly appeared in 1989 under the hood of Subaru Legacy. ). 0L Engine Specs, Problems & Reliability The Subaru EJ20 is a 2. ) In my experience, EJ20 had better long term reliability than EJ25. 0-liter FA20 was built off of the block used by the FB20 but with new pistons, rods, and a new crankshaft. FA20 Engine Problems and Reliability. Makes up for any other defect imo. 0 motors last forever with care. EGR/TGV deletes and AOS can help remedy the carbon build up, new conrods to prevent them being thrown out the side of the damn block, and a tune for the rev hang. In my experience, EJ20 had better long term reliability than EJ25. Subaru’s EJ series engine was first introduced in 1989, and became the most commonly used engine in the Legacy and Impreza in the early ‘90s. The conrods start becoming a problem around 300+ WHP. 1. They sound so good too. 0 EJ engines hold up pretty well when taken care of and not modified. Rough idling, shakes at low rpm. It can be fixed by upgrading or reloading the Engine Control Unit's firmware. With frequent oil changes, and no stupidity (not going full boost in 5th or 6th from low RPMs, etc) has the EJ typically been reliable? 2. That is a problem with the firmware of the ECU. I agree the 2. mxtmcn ycza eqrq tkb ocofii ueqmjne pwpbm puwutgn jljzo yoigq