So last month my Corolla broke down. On my way to work getting off of the freeway my car started losing power and would barely accelerate and it worsened the more I pressed the pedal. I got it home and started testing for spark, timing, etc. I found that priming the fuel pump several times and then starting it would allow it to run for 4 or 5 minutes and I could still hear the fuel pump so I replaced the fuel filter and boom runs great for 3 days and now after doing anything above 40mph at idle it will randomly stumble and worsens if it’s idling in gear. I ordered a brand new Denso fuel pump and regulator just to see. I don’t have any acceleration issues or power loss or dying while driving but I’m kind of stumped on what it is without throwing the parts cannon at it. Oh and if it helps, before replacing the fuel filter any time I could get it to start it smelled real funny I don’t know how to describe it but it didn’t smell right.
Aug 11, 2026 at 1:32 PM
