I have a 1998 Legacy Post Wagon (2.2l) that just recently, in the last 2 weeks, has developed a hesitation, but only uphills (steep or gradual), and only when I back off on the throttle and then try to start off...she will stumble, knock a little, and sometimes stalls.
Hooked up a fuel pressure gauge, and when my car was idling 22-25 PSI, under load, it was between 28-32...when it hesitated, the pressure didnt drop. Took the vacuum hose of the FPR, and PSI went to 35. Car off, key on, was not getting a pressure reading, so I did end up changing the pump to a Walboro.
With the new pump, key on, car off, pressure is holding at 30... start car, pressure holds at 27 when idling, 26 when going down hill....max PSI I saw was 35, and that was on a straight with the throttle matted. Better power now with the new pump, but still didnt change the hesitation issue.
Installed new NGK plugs, NGK wires, NGK coil, transmission filter, fuel filter, air filter, oil and filter, OEM thermostat, OEM radiator cap...still the problem exist...had my battery and alternator checked, and they came back perfect. No codes....nothing....so at a loss right now. Any help would greatly be appreciated.
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