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

HALLCM81

MEMBER
1998 LINCOLN TOWN CAR
4.6L
AUTOMATIC
20 MILES

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.

3 Replies

RASMATAZ

MECHANIC
75,992 POSTS

Start by checking the fuel pressure with a gauge-could be injectors are hanging up.

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Saturday, June 21st, 2014 AT 3:43 PM

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.

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Sunday, June 22nd, 2014 AT 8:03 AM

KASEKENNY

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.

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