2009 Toyota 4runner Engine Problems

Your 4Runner's transmission hesitates when you accelerate after slowing down below 15 mph, causing the engine to rev high without responding smoothly — a problem that's especially dangerous on slippery roads when the vehicle finally lurches forward and could cause the wheels to spin out. You've had the dealership reflash the engine computer twice, but the issue persists. Toyota has issued a technical service bulletin (TSB-0166-10) for the 2010 model that addresses this exact problem, but your 2009 model hasn't received the same fix. The repair will likely involve a transmission control software update or recalibration beyond the standard ECM flash.

Your 4Runner has a transmission delay problem that started right after you bought it new. When you slow down to turn a corner at low speeds and then accelerate, the engine revs high (2500-3000 RPM) for several seconds before the transmission engages, causing the car to suddenly lurch forward. This has happened during normal turns and once during highway merging, creating a safety concern. The dealership has reset the computer multiple times without fixing the issue, and Toyota hasn't provided a satisfactory explanation. A transmission control module reprogramming, transmission fluid service, or replacement of internal transmission components may be needed to resolve the delayed engagement.