I have a manual transmission (2008 Honda Fit Sport) and recently got my car serviced, including oil change and "fuel system cleaning", at a shop I have never used before. After the service, my car seems to have significantly worse acceleration. Specifically, if I press the accelerator down aggressively, the engine makes a lot more noise than it used to and doesn't pull nearly as strongly as it used to, especially in the middle gears at low(ish) RPM. The noise is a buzzing sound, and dies down if I let up on the accelerator. When trying to accelerate, the revs seem to climb slowly. Opening the throttle wider makes the sound louder, but doesn't make the revs or road speed go up any faster.

If I drive very gently, it's hard to tell whether the noise or acceleration is worse than it used to be. I can still creep up to highway speed at a leisurely pace, but I can't get there urgently.

What's wrong with my car? What did the service guys do to it? It was definitely not like this before they got their hands on it.

  • Have they left a rag in the intake somewhere? Or have they left the pipe from the turbo loose? – Solar Mike Jul 30 '18 at 7:38
  • I too faced similar issue .Tracing down I found the air filter was not fixed properly.Seems like blockage at air intake.is your air filter clean and fixed in place properly.? – DhKo Jul 30 '18 at 11:37
  • @DhKo should be clean as it was a service : but there are cowboys around ... so you never know... – Solar Mike Jul 30 '18 at 11:56
  • @SolarMike - I'm pretty sure the Fit doesn't have a turbo ... my daughter's 2009 Fit Sport doesn't have one and the drivetrain is the same from 2008 to 2009 (though there are other differences in the years). The rag idea is something to check ... first thing which came to my mind. – Pᴀᴜʟsᴛᴇʀ2 Jul 30 '18 at 13:38
  • @Pᴀᴜʟsᴛᴇʀ2 unluckily (or luckily...) I don’t have one to check, but as loss of pressure post turbo is a possible cause of low power I put it in as something to check... also a leak or loose connection post map or maf it can still be relevant... – Solar Mike Jul 30 '18 at 13:43

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