Mileage Sos

Reply Subscribe

Thread Tools

Search this Thread

Jan 23, 2006 | 01:48 PM

JGCorley

Thread Starter

Freshman User

Joined: Oct 2004

Posts: 43

Likes: 0

Mileage Sos

I have a 94 Auto 4.0 with 184K...I have had recent issues with a faulty MAF and Vacuum Modulator; Cel codes led to the new MAF and leakage of trany fluid into the crankcase led to the the new modulator; I am not sure why the mileage has been so effected but it dropped from about 20 mpg down to about 15 mpg at the same time the above issues started; I was wondering if anybody had a similar significant drop in mpg...the truck runs well with no hesitation or loss of power...the wires, plugs, and air filter are good...no vacuum leaks were found and the fuel filter is new...no cel's currently found and no change in driving conditions

Jan 23, 2006 | 02:17 PM

CowboyBilly9Mile

Post Fiend

Joined: Feb 2003

Posts: 6,940

Likes: 2

From: Eastern WA

With cooler weather you (me, and just about everyone) will take a hit on mileage. This is especially true if your trips are short.

Jan 24, 2006 | 08:05 AM

pawpaw

Moderator

Joined: Jan 2004

Posts: 13,851

Likes: 111

From: SW Va

Bill is right about winter taking it's toll on MPG in cold country, but seeing as how you live in S.C. , seems to me a 5 mpg drop is maybe a little much for winter there.

So, I wonder if the plugs, intake valves & combustion chamber may have become carbon fouled, from the tranny fluid that was ingested?????

Maybe a spark plug looksee, is in order & if they are, also maybe a dose of a good combustion chamber cleanerupper, like "Techron Concentrate", along with a tank of Chevron or Chevron/Texaco gas, and some spirited highway driving, would help tidy things up!!!!

It has worked in the past on my 99 4.0L, to get & keep the CCDI under control & MPG up.

Just a thought or two for consideration.