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post #1 of 47 (permalink) Old 03-17-2005, 10:15 PM Thread Starter
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Improve Gas Mileage

I have read around these forums on ways to improve gas mileage, and have followed a decent amount of them. I went from 11 MPG to 14 MPG (city). However, thats still low to me.

In the past few weeks I have:
-Replaced fuel filter
-Tire Rotation/Alignment/Air Pressure (35 PSI)
-Seafoam in engine (2 didfferent times for thorough cleaning)
-STP fuel cleaner put in gas tank (changed fuel filter after a couple tank refills so the clogs are not in the new filter)
-Seafoam put in gas tank (Was done before fuel filter was replaced)
-90 Thunderbirds don't have a MAF
-Upgraded to Valvoline Maxlife oil.
-Motorcraft oil filter installed
-6 new & gapped motorcraft spark plugs & wires
-Replaced cap & rotor
-Seafoam Transmission cleaner put in
-Transmission oil & filter cleaned

-Air Filter is about one month old
-PCV Breather about one month old
-PCV Valve is about one month old

I'm now thinking that the Oxygen (o2) Sensors may be what I need to replace. Any other things that I should look at? I got this car with 90K+ miles on it, so I don't know what has been done with the car. The car is still mechanically in good shape (no leaks, no bumps or any problems when driving), and has been that way since I got it.

I'm sure that has to have been some basic stuff that I didn't do that could help.

Are Oxygen Sensors basically my last resort? How many would I need to purchase? Any information on this would be helpful (of course im going to search for info too).

Thanks in advance.
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post #2 of 47 (permalink) Old 03-18-2005, 01:43 AM
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did you put the Seafoam into the oil or into a vacuum hose to burn off the carbon in the combustion chambers?

factory recommended tire pressure is 30psi acually, but I usually run mine at 32psi. No biggie though really.

So you use the car in mostly city driving. Are there are lot of stop lights in your city? How are your driving habbits in relation to the foot to gas pedal ratio? That can be good for 5-8mpg alone if you drive harshly.

-Thomas

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post #3 of 47 (permalink) Old 03-18-2005, 02:40 PM
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Quote:
Originally Posted by Thomas
How are your driving habbits in relation to the foot to gas pedal ratio? That can be good for 5-8mpg alone if you drive harshly.

-Thomas
So that's why my last tank was 18.4 mpg Maybe I should have my foot to the floor so much


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post #4 of 47 (permalink) Old 03-18-2005, 04:06 PM
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Wow. I thought Ford got rid of all that speed density crap on its cars in 1989.

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post #5 of 47 (permalink) Old 03-18-2005, 09:42 PM Thread Starter
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Quote:
Originally Posted by Thomas
did you put the Seafoam into the oil or into a vacuum hose to burn off the carbon in the combustion chambers?
Both, besides the 2 different vacuum hose times, I put a pint in the oil then drove about 150 miles or so.

Quote:
Originally Posted by Thomas
So you use the car in mostly city driving. Are there are lot of stop lights in your city? How are your driving habbits in relation to the foot to gas pedal ratio? That can be good for 5-8mpg alone if you drive harshly.
Mostly city, though I do drive about 30 miles (15 there 15 back) on the freeway Fridays. There aren't too many stop lights where I go. To give you a more accurate description, I punched in my home & school address (my most frequent trips) into mapquest. 2.16 miles and I only hit 2 stop lights. I would say that I don't drive harshly.
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post #6 of 47 (permalink) Old 03-22-2005, 06:26 PM
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i would say o2's or clogged cats maybe. is there a CEL on? if so, best way would be to take to the dealership and have them, run the codes. just my $.02

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post #7 of 47 (permalink) Old 03-22-2005, 08:51 PM Thread Starter
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I've tried easing up on the pedal, and im getting about 16 MPG now. I'm pretty happy with that, though im sure theres always room for improvement.

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i would say o2's or clogged cats maybe. is there a CEL on? if so, best way would be to take to the dealership and have them, run the codes. just my $.02
There isn't a CEL. How would one remedy the clogged cats? Is it a do it yourself? I remember reading that it is possible to simply clean the o2 sensors instead of replacing them, how would one do that?
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post #8 of 47 (permalink) Old 03-22-2005, 11:48 PM
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Hmm I thought these cars/3.8;s always get good gas mileage I get around 27 to 30 miles per gallon.
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post #9 of 47 (permalink) Old 03-23-2005, 12:00 AM
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Easiest way to unclog the cats is remove them completely.

Just buy new O2s.

Some supercharged cars blow.......Others just pick up and move.
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post #10 of 47 (permalink) Old 03-23-2005, 02:22 AM
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Quote:
Originally Posted by tgg
Hmm I thought these cars/3.8;s always get good gas mileage I get around 27 to 30 miles per gallon.

mine got 32mpg highway before my head/cam swap. I think I could still get it once I get a dyno tune.
-Thomas

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post #11 of 47 (permalink) Old 03-23-2005, 05:39 PM
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Quote:
Originally Posted by tgg
Hmm I thought these cars/3.8;s always get good gas mileage I get around 27 to 30 miles per gallon.
LOL, I see 15mpg

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post #12 of 47 (permalink) Old 03-23-2005, 06:53 PM
 
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For me its about 17-20 city and 24 on the highway. Though mine could use a seafoam cleaning, just gotta get around to picking a bottle up.
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post #13 of 47 (permalink) Old 03-24-2005, 02:09 AM
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Quote:
Originally Posted by Blue LS
For me its about 17-20 city and 24 on the highway. Though mine could use a seafoam cleaning, just gotta get around to picking a bottle up.
Shoot, my car gets that much right now and it runs Effing rich. I mean RICH. When the car is cold, if I leave it idling in one spot for a few minutes you can look behind the car and there are 2 streaks about 3 feet long of gas where the exhaust tips are spraying it out. That's how damn rich my car runs, and still manages about 18mpg on average. Before my head/cam/etc swap I got 32mpg. I cant wait to get a dyno tune, gas prices are killer
-Thomas

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post #14 of 47 (permalink) Old 03-24-2005, 07:55 AM
 
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gas prices are killer
Your telling me, cost me almost 60 bucks to fill the tank from empty last time. Once the weather gets better here (mainly the hockey rink in my driveway melts) Im gonna go through it and try to find why it is low on the highway. I already know why in the city.
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post #15 of 47 (permalink) Old 03-24-2005, 09:19 AM Thread Starter
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A trustworthy mechanic down my street is going to look at my car today (my power steering line got torn up) and he said he would help me with my mileage issue today. He said he will check/adjust my timing and see what other things can be done.

I'll let you guys know what he does to help my MPG. Unfortunately, I won't really know if any progress was made for about about 4 days. As I will only be doing freeway driving until Monday.
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post #16 of 47 (permalink) Old 03-25-2005, 07:26 PM
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There has got to be something else wrong. My v-8 car gets (got) 18-22 before she locked up. The 3.8s got 25 or better. This is one I would have to see to understnad the problem.

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post #17 of 47 (permalink) Old 03-25-2005, 07:55 PM
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Quote:
Originally Posted by seawalkersee
The 3.8s got 25 or better. Chris

yeah, but remember, his car is 15 yrs old. i just took a trip to fl in my '93 bird, and my mileage varied between 19-23 mpg on premium fuel. i was hoping to get near the factory 27, but it wasn't realistic.

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post #18 of 47 (permalink) Old 03-25-2005, 09:56 PM Thread Starter
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Well, the guy said my timing was off, I forgot by exactly how much, and he adjusted it. There wasn't a problem with my power steering, I had an oil leak. So I had to get everything steam washed, dye the oil, and whatnot. He also fixed a leak in my radiater. So he was rushing on time since he had other stuff lined up. I didn't get to talk to him too much about my MPG. Although he said my tension pulley needs to be replaced, and to come back later with the part and he will put it on. I plan to discuss it more with him then.

So far, I don't really have much to compare to... as I have only been "driving" in bumper to bumper freeway traffic. However, I'm sure it will help so.

27 MPG is the factory amount? Wow, what I would give to get 27 MPG.
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post #19 of 47 (permalink) Old 04-07-2005, 02:49 AM
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27 is what it got NEW under highway driving conditions, it only gets 20 "LOL mine only gets 16-17" city
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post #20 of 47 (permalink) Old 04-07-2005, 02:54 AM
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in the first month i had my cougar i got 31 highway, but then again that was on a 600 mile trip from akron to maryland

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post #21 of 47 (permalink) Old 04-07-2005, 11:18 PM Thread Starter
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I'm now averaging 17 MPG, which I feel is greatly do to the timing belt adjustment. I figure that I wont be able to get much more than 17 MPG out of my bird.
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post #22 of 47 (permalink) Old 04-07-2005, 11:30 PM
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You should upgrade to a MAF setup and get a tune for better gas milage. It would actually pay for itself in the long run.

Some supercharged cars blow.......Others just pick up and move.
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post #23 of 47 (permalink) Old 04-07-2005, 11:35 PM
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Quote:
Originally Posted by Tom
I'm now averaging 17 MPG, which I feel is greatly do to the timing belt adjustment. I figure that I wont be able to get much more than 17 MPG out of my bird.

All ford 3.8's, 3.9's, and 4.2's have a timing chain that's automatically adjusted by the chain tensioner.

Really, just regular maintenance items can regain the fuel economy, and cleaning out the intake system and head ports can gain gas mileage and performance as well, since a lot of buildup occurrs after 10-15 years of the car being driven.

-Thomas

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post #24 of 47 (permalink) Old 04-13-2005, 12:15 AM
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What gears does everyone have, especially the ones around 30mpg?

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post #25 of 47 (permalink) Old 04-13-2005, 12:26 AM
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3.27 open

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post #26 of 47 (permalink) Old 04-13-2005, 05:34 AM
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Did you say your blowing gas out the tail pipes T? No way. There would be no combustion.

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post #27 of 47 (permalink) Old 04-13-2005, 08:22 AM
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well it may be really rich smelling condensation now that Ive thought more about it. But I'll have to take a pic, I think it's kind of funny to see those two long streaks whenever I let my car sit for a few minutes.

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post #28 of 47 (permalink) Old 04-13-2005, 12:07 PM
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It is odd indeed. Im not sure why it would spew that much even on a cold day. When we have the fleet cars run a lot while they sit you can leave pools in the cold weather. Then when they take off it leaves these long streams that freeze up.

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post #29 of 47 (permalink) Old 05-15-2005, 10:17 AM
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Quote:
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Wow. I thought Ford got rid of all that speed density crap on its cars in 1989.
Call it what you want but speed density Mustang 5L's were faster than Mass air 5L's.
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post #30 of 47 (permalink) Old 05-15-2005, 07:48 PM
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its great for stock performance. But you cant modify the motor and get any gain from it.

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