Subster Dude Posted October 8, 2014 Share Posted October 8, 2014 Hi all, I have a 98 Forester S with 135,000 miles and have experienced the following: Lack of power, Seems to be better when warm. Transmisson seems to not down-shift when pressing accelerator. I have tuned up the engine with fresh spark plugs, air and fuel filters, Fuel pump, Knock sensor, cleaned EGR valve, timming belt, idlers, tensioner, water pump, replaced the front and rear O2 sensors as well as the coil and wires. Transmission fluid has been changed. All in all I have not experienced the transmission lag when shifting into drive, but I am wondering if I am feeling the effects of a sensor or solenoid failure in the making. When I step down on the accellerator, It feels like ther is no responce. Using a cheep scan tool to read live data, the only thing I notice is when the engine does respond, it is in open loop. No codes and the engine runs smooth. Some Subaru owners have complained of similar issues and have adaped driving habits to compensate, I would rather find a fix as my wife needs to be safe on the highway. Any help is appreciated. Quote Link to comment Share on other sites More sharing options...
lmdew Posted October 8, 2014 Share Posted October 8, 2014 Is the RPM changing when you press on the gas? If not and no CEL code think MAF Quote Link to comment Share on other sites More sharing options...
Subster Dude Posted October 8, 2014 Author Share Posted October 8, 2014 I did clean and even tried a replacement sensor with no change. Quote Link to comment Share on other sites More sharing options...
faiyolsystems Posted October 13, 2014 Share Posted October 13, 2014 I have same problem with my imprezza 2000. I noted as you did that when the engine warme up, the problem is less Quote Link to comment Share on other sites More sharing options...
Subster Dude Posted October 19, 2014 Author Share Posted October 19, 2014 I still believe it has to do with the transmission sense signal to downshift and or the valve body is sticking. I guess this from the warm transmission shifting better, and the fluid when cold is either not flowing smooth almost like the not moving forward symptom which may be soon to come. Quote Link to comment Share on other sites More sharing options...
nipper Posted October 20, 2014 Share Posted October 20, 2014 I don't see it listed here, but has the transmission been serviced? What happnes when you manually downshift the car? Quote Link to comment Share on other sites More sharing options...
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