Engine stumbles under acceleration as if missing?

Tiny
MAXIE316
  • MEMBER
  • 2018 FORD ECOSPORT
  • 2.0L
  • 4 CYL
  • 4WD
  • AUTOMATIC
  • 39,000 MILES
Engine stumbles under acceleration as if missing.
I suspect high pressure fuel pump is low putting out245-290psi at idle 1100 at 2000rpm in park. What should the high and low pressures be. These numbers are from scan tool
Sunday, March 1st, 2026 AT 10:35 AM

7 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,479 POSTS
Hello

The Ford direct injection systems typically do not idle as low as 245-290 PSI. That is low. I would scan for codes to see if you have

P0087 (rail pressure too low)
P0088
P0191
P228C

Can you confirm the car has 39k on the odometer please? Also, can you tell me if you have replaced the spark plugs or ignition coils, these can fail and cause a stumble misfire. Lets start with the scan here is a video that can help

https://www.youtube.com/watch?v=LBCpCWEFnTg

Please let us know what happens.
Was this
answer
helpful?
Yes
No
+1
Monday, March 2nd, 2026 AT 8:50 AM
Tiny
MAXIE316
  • MEMBER
  • 5 POSTS
No codes or check engine light. Plugs and coils were changed, yes only 39k miles. Going to get a fuel pressure gauge for the low pressure side. Hi pressure came from innova scan tool.
Was this
answer
helpful?
Yes
No
Monday, March 2nd, 2026 AT 9:21 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,479 POSTS
Yup, this leaves the high pressure pump, a little premature failure but you never know, please let me know if that fixes it, Ken
Was this
answer
helpful?
Yes
No
Tuesday, March 3rd, 2026 AT 9:12 AM
Tiny
MAXIE316
  • MEMBER
  • 5 POSTS
Put a new high pressure pump on idle pressure now 500-600 psi.
Drives better. These pumps are expensive so be sure that's the problem.
Was this
answer
helpful?
Yes
No
Tuesday, March 10th, 2026 AT 2:55 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,479 POSTS
Yep they are, glad it fixed the problem, please use 2CarPros anytime we are here to help.
Was this
answer
helpful?
Yes
No
+1
Wednesday, March 11th, 2026 AT 8:18 AM
Tiny
MAXIE316
  • MEMBER
  • 5 POSTS
Thanks I will keep you in mind
Was this
answer
helpful?
Yes
No
Wednesday, March 11th, 2026 AT 2:25 PM

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...