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Transmission, computer or differential issue

Tiny
DANIEL BECHER
  • MEMBER
  • 2017 FORD FOCUS
  • 2.0L
  • 4 CYL
  • TURBO
  • 2WD
  • MANUAL
  • 70,000 MILES
I have the car listed above ST model. Recently it was lacking power, and I found that it was down 7psi (from 22psi it sits at 15psi). If I keep it between 3,500 rpm and 4,500 rpm for ten to fifteen seconds the check engine light will start flashing and if I try to accelerate the car will start to jitter and maintain its pace, if I slow down and switch to first the issue goes away. Just tonight I pushed the pedal all the way down when this happened and the rpm began to climb at about 1,500 rpm a second, and I could tell something was slipping (not the tires). Also, the car has a salvage title, but the damage go past the bumper bar.
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Wednesday, January 9th, 2019 AT 10:52 PM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Hi and thanks for using 2CarPros.

When the check engine light starts flashing, that indicates there is a misfire occurring. Now, if the RPM's were going up but acceleration doesn't seem to correlate with the increase in RPM's and it seems something is slipping, it could be the clutch. However, a misfire can cause jitter you mentioned.

What I recommend is to start by having the computer scanned for diagnostic trouble codes. Here is a quick video showing how it's done:

https://youtu.be/YV3TRZwer8k

If you have a scanner, please do this first. If you don't, often times nationally recognized parts stores will do it for free. Once you do that, let me know what codes are found. It should indicate if there is a problem with the turbo boost solenoid, or the charge air cooler or anything else.

Take care,
Joe

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Friday, January 11th, 2019 AT 9:10 PM
Tiny
DANIEL BECHER
  • MEMBER
  • 3 POSTS
Sorry for responding so late. It appears that the misfire is the issue the code is p0300, p0302, p0303 it is misfiring in cylinder two, and three. I am also having issues with my headlights now, which are brand new, so there might be some wiring issues.
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Wednesday, January 16th, 2019 AT 5:23 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Welcome back:

Random misfire and as you mentioned, cylinder two and three. Start with checking fuel pump pressure.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

If you need anything, let me know. Also, you mentioned new headlights. Did you change the type of lighting?

Joe
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Wednesday, January 16th, 2019 AT 5:27 PM
Tiny
DANIEL BECHER
  • MEMBER
  • 3 POSTS
The headlights are aftermarket, as the OEM ones were damaged and replaced, but I think the original halogen bulbs were reused. I am not sure I am not the one who did the work.
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Friday, January 18th, 2019 AT 7:09 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,885 POSTS
Okay. I asked about the lighting because often times changing the system type will have adverse affects.
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Friday, January 18th, 2019 AT 9:52 PM

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