I’ve got a 2013 Ford Fiesta with about 33,000 miles on it. I think there’s a problem in the fuel system. I took it to a mechanic, but he could not reproduce the issue so he did not fix it.
The car tends to hesitate when I accelerate from a dead stop. It sort of bucks, shakes, and hesitates a little. I think I hear some sort of knocking and scraping sounds from below, as if there is something down there that is hanging too low and hitting the ground.
I think that the mechanic could not reproduce this because the car was not “tired”. What I mean is that the mechanic is a mile down the road and my sister took the car there in the morning. The car usually works very well under those conditions.
However, I have a long commute through a lot of stop and go traffic. I drive about 32 miles each way every day. It starts to get worse when I get close to work in the morning, but is pretty consistently bad in the evening when I get home. The spark plugs were replaced recently, and the mechanic said he didn’t see anything wrong with the fuel injectors. But I take that with a grain of salt.
Any idea why this is happening and only seems to happen after the car has been running for a while?