I currently have a Vanagon with a Subie 2.2 engine. After warmup, my engine would hesitate, buck, backfire etc. I checked and replaced a bunch or potential Subaru ignition bits only to find out that it was the VW fuel pump was flaky and it was causing the problem....it seemed after the motor in the fuel pump would warm up (10-20 minutes) it's performance would degrade significantly. Go figure. Symptoms were louder than usual fuel pump noise and major hesitation when going uphill, but the engine ran fine downhill....turns out the fuel pump couldn't provide the required amount of fuel the engine needed to go uphill. Check your fuel pump and/or fuel filter(s). If you don't have a fuel system pressure gauge, try swapping your fuel pump with a known good one. |
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