Extremely poor fuel mileage (MPG)and check engine light is on

1998 LINCOLN TOWN CAR
20 MILES • 4.6L • AUTOMATIC
Avatar
HALLCM81
  • MEMBER
  • 2 POSTS
I have the car listed above that's burning way too much gas. Every miles I drive I burn about one gallon of gas. I thought it was the gas line like a leak but I checked all of the starting from the fuel neck to front of the car found nothing. I checked all the seals around the gas tank and got nothing. I also check all of the vacuum hoses. I'd did one last thing reset the dial computer in it and filled it up and that didn't seem to work as well.
Jun 21, 2014 at 7:17 AM
Avatar
RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
Start by checking the fuel pressure with a gauge-could be injectors are hanging up.
Jun 21, 2014 at 8:43 AM
Avatar
HALLCM81
  • MEMBER
  • 2 POSTS
Where are the injectors located. How do I check them? I forgot to mention the check engine light came on I'm going to check the man sensor and clean it today as well.
Jun 22, 2014 at 1:03 AM
Avatar
KASEKENNY
  • ✓Experienced Mechanic
  • 18,907 POSTS
We need to start with checking for codes. Here is a guide that will explain how to do this if needed:

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

With out the codes this could be a number of things. This could be high fuel pressure which is causing too much fuel to be sprayed. The other most likely issue is the injectors are damaged due to contamination and they are just dumping fuel when they should be closed.

Here is a guide to explain how to test the fuel pressure to ensure that is in line:

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

Clearly the codes are going to tell us what direction to go so let's start there.
Image (Click to enlarge)
Attached Media
Apr 17, 2020 at 11:47 AM
🔧 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