Random multiple misfires?

Tiny
AYOBAMI
  • MEMBER
  • 2002 TOYOTA COROLLA
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 4,000 MILES
The car usually hesitates while climbing high hill.
Wednesday, August 10th, 2022 AT 9:20 PM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,895 POSTS
It sounds like you have a weak fuel pump, but we should run the codes to see what comes up. here are guides to help you get the codes and check the fuel pressure and i have included how to change the fuel pump out just in case you need them in the images below.

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

and

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

I have also seen the MAF sensor cause this problem and it won't show a code for it. Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.

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Thursday, August 11th, 2022 AT 10:09 AM

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