SpaceCase44 Posted July 21, 2014 Share Posted July 21, 2014 I have a 2002 Outback sport. I began having hesitation problems about one year ago. The hesitation would only occur after a fuel fill up and last for about 1-2 minutes then gone. Did not occur at idle, only when driving. Now, I've been having the issue at varying fuel levels regardless of fuel fill up or not and the hesitation appears to be worsening. The Knock sensor has just been replaced with no improvement in the hesitation. I've suspected the fuel filter, water in the fuel, what else? Any thoughts? Quote Link to comment Share on other sites More sharing options...
Dinky26 Posted July 21, 2014 Share Posted July 21, 2014 Fuel pump possibly. Quote Link to comment Share on other sites More sharing options...
Rooster2 Posted July 21, 2014 Share Posted July 21, 2014 replace fuel filter first, see it that helps. If not, then suspect fuel pump as dinky suggests. Quote Link to comment Share on other sites More sharing options...
Mr.Atlantis Posted July 21, 2014 Share Posted July 21, 2014 Is this a year where the Fuel and Filter is a combo unit? Quote Link to comment Share on other sites More sharing options...
Fairtax4me Posted July 22, 2014 Share Posted July 22, 2014 02 still has the filter under the hood as far as I know. How old are spark plugs and wires? Air filter? PCV valve? Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted July 22, 2014 Share Posted July 22, 2014 ^^^ look for oil in the plug tubes too. might not hurt to try a tank with a bottle of Techron, or maybe SEaFoam too. Quote Link to comment Share on other sites More sharing options...
CNY_Dave Posted July 22, 2014 Share Posted July 22, 2014 I think I recall an emissions equip problem that would fill the charcoal cansiter with gas when filling/driving, which would then cause a too-rich condition. Sound familiar to anyone? Quote Link to comment Share on other sites More sharing options...
1 Lucky Texan Posted July 22, 2014 Share Posted July 22, 2014 (edited) ^^^ hmmm, I think I read where there was a weight limit on how much a canister could weigh. maybe find that value and pull the canister and weigh it? Saturated cansiter would weigh a lot more than 'dry' I'd guess. maybe the gas tank's vent valve stuck open would lead to this? Or a malfunctioning Purge valve? Edited July 22, 2014 by 1 Lucky Texan Quote Link to comment Share on other sites More sharing options...
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