Misfire?

2009 FORD ESCAPE
172,800 MILES • 3.0L • V6 • 4WD • AUTOMATIC
Avatar
JUNIT0483
  • MEMBER
  • 1 POST
I had a misfire a few months ago. Cylinder 1 had a bad coil. I replaced all 6 COP's and plugs as well as new gaskets and fuel injectors since I was already in there. About a month went by and the misfire returned except this time it isn't producing a CEL. 2 things I've noticed that seem unusual. If the vehicle is positioned downward on a steep hill it is guaranteed to cause a misfire. However, it will misfire at other times as well. The misfire can last for short periods or long periods. And the second thing is when the misfire occurs, the A/C unit will not blow cold anymore. When the misfire goes away the AC/ blows cold again.
Any insight would be appreciated.
Jun 24, 2023 at 1:30 PM
Avatar
JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,246 POSTS
Hi,

If the computer senses a misfire, it will cut the AC to save power. As far as the misfire, if there is no check engine light or code stored, you may want to consider testing fuel pressure. Also, if you have it facing downhill and it happens, it could be due to a low level in the fuel tank. The pump is positioned toward the rear.

Start by testing the fuel pump pressure to make sure it isn't weak.

Here is a link that explains how it's done:

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

I attached the manufacturer's fuel pressure specifications below.

Let me know what you find.

Take care,

joe

See pic below.
Image (Click to enlarge)
Professional Diagram for 2CarPros Members
Click here to log in and view diagram.
Jun 24, 2023 at 4:03 PM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle