Hesitation accelerating?

Tiny
AZRAHSYEL
  • MEMBER
  • 2010 KIA RIO
  • 4 CYL
  • 2WD
  • MANUAL
  • 200,000 MILES
About half the time when I accelerate from 1st or 2nd gear it doesn't accelerate with full power for either a good 5 or so seconds or sometimes if I push the clutch in and release again it will finally catch. Doesn't have any issues in 3rd or higher.
Thursday, April 24th, 2025 AT 10:00 PM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
Do you have a check engine light warning? If so, we should run the codes to see which ones are stored.

This guide can help:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

If there are no warning lights, I would check the air filter. If that is okay, I would swap out the fuel pump which I have seen get weak and not allow the engine to get full power. Here is how the job is done. Check out the images (below). Please let us know what happens.
Images (Click to make bigger)
Thumb
Thumb
Thumb
Thumb
Was this
answer
helpful?
Yes
No
Friday, April 25th, 2025 AT 10:39 AM
Tiny
AZRAHSYEL
  • MEMBER
  • 2 POSTS
Hi! The check engine light hasnt come on and stayed on, it will flash on and off for a few seconds every once in a while but from previous experience my car doesnt store codes unless the mechanic was lying to me, so I havent been able to see what it was.

I will check the air filter, and check the fuel pump too in needed. I have noticed it has also recently started making a loud clicking/tapping sound occasionally when its been refusing to accelerate as well. Its been getting worse in general, I'm hoping to dive into it tomorrow!

Thanks for the help!
Was this
answer
helpful?
Yes
No
Saturday, May 10th, 2025 AT 3:00 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,574 POSTS
Sounds good, I would think the fuel pump is weak, but you never know with out testing it. Have good weekend.
Was this
answer
helpful?
Yes
No
Saturday, May 10th, 2025 AT 11:54 AM

Please login or register to post a reply.

Related Engine Hesitate Content

Vacuum Leak Test and Repair
VIDEO
Vacuum Leak Test and Repair
In­struc­tional re­pair video
Hesitation
GUIDE
Hesitation
An en­gine hes­i­ta­tion is an in­ter­rup­tion of con­tin­u­ous power dur­ing ac­cel­er­a­tion. When a en­gine is hes­i­tat­ing it will cause the car to lunge or surge which will cause a...
VIEW MORE