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Doug, ASE Certified Technician
Category: Mitsubishi
Satisfied Customers: 8606
Experience:  Mitsubishi employed and Factory trained ASE certified technician
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Mitsubishi Endeavor: vehicle shudders at fifty to sixty kilomiters

Customer Question

vehicle shudders at fifty to sixty kilomiters stops if you speed up
Submitted: 2 years ago.
Category: Mitsubishi
Expert:  Doug replied 2 years ago.
Hi,This is a pretty common complaint on this model, but is usually easily resolved. When the problem occurs does it feel similar to driving down a wash board road or like you are hitting the warning bumps on the side of the highway?
Expert:  Doug replied 2 years ago.
It looks like we missed each other. If you are getting that wash board road sensation in the 50-60km range this is nearly a sure thing for a torque converter shudder. This is a very common complaint on this vehicle, and is pretty much always a problem with the fluid... either the condition or the type being incorrect.The computer causes a partial application of the torque converter when under light acceleration to coasting in upper gears, and when the fluid is not up to the task it causes an uncontrolled slip to occur, which is what makes that violent steady shudder until you accelerate through it.To avoid this condition the transmission needs to be flushed every 50000 km to avoid problems, and SPIII from Mitsubishi must be used. Neither the fluid or the method is up for negotiation unfortunately; since draining the transmission only gets about 1/3 of the fluid out (and none from the converter at all), draining and refilling essentially just wastes your new fluid, contaminating it with the existing fluid. Likewise, you must use Mitsubishi (or Hyundai) SPIII fluid, from a dealership, without exception here. If you use universal/multi-car/Asian-car/Dexron/etc or even the sole NAPA SP3 (which is base don SP2 and is not compatible), you WILL cause this problem rather than cure it. There is literally no acceptable substitute for the proper SPIII provided by Mitsubishi or Hyundai.With a case of fluid flushed through (price varies, but usually between $179-249 at the dealership, or you can buy the case of fluid there for $96 and take it to an independent shop for flushing), the vehicle should exhibit an improvement instantly... anywhere from 20-50% improvement within a mile or so. Over the course of the next 100km it should resolve 80-100%. This is the time it take for the fresh fluid to bed in to the friction material in the torque converter.If the problem persists after 100km+ has been driven after a proper SPIII flush, then your only option would be a torque converter failure at that point. It is worth noting that this is nearly never the case however.... the only times I have run in to these where the converter required replacement was a few defect units around 2010 model year (obviously would not apply to you) and in cases where the problem was ignored for thousands of kilometers. When the vehicle is driven extensively like this it will eventually damage the converter and at that point replacement is the only issue, however again this only happens when people drive 10-20k km ignoring the condition and causing further damage. If it is addressed even remotely soon after it started (say 2000km or less), you will usually see 90-100% improvement within 100km.