Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

tune up Q's


  • Please log in to reply
13 replies to this topic

#1 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 24 March 2005 - 06:36 PM

I changed the coil, plugs, wires, cap & rotor. My mpg didn't go up 1/2 mile per gallon. Shouldn't I have gotton more than this? Please Help.

#2 grossgary

grossgary

    Elite Master of the Subaru

  • Members
  • 20,078 posts
  • WV

Posted 24 March 2005 - 07:06 PM

not necessarily, so long as you're getting enough spark for thorough fuel combustion new igntion components may or may not give you any increases depending on mileage and condition of the old ones. you gapped the plugs properly and used NGK plugs or what?

are you worried about your gas mileage?

how many miles do you have?

02 Sensor is probably a good item to address.

#3 BobBrumby

BobBrumby

    Subaru Nut

  • Members
  • 583 posts
  • Brisbane, Australia

Posted 24 March 2005 - 07:08 PM

What car do you have would be helpfull e.g. carb, spfi, mpfi, year and miles? Is your ecu throwing any codes (if you have efi) or has the carb ever been rebuilt? Like are there any other symptoms other than the bad mpg? btw: how many miles are you getting to the gallon now?

#4 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 24 March 2005 - 09:35 PM

1987 GL Wagon. Carbed, 173K, supossed to be a newer engine, not really sure. I am getting 22MPG right now. New NGK plugs, Accel coil, 7mm silicone wires. Would like to get at least 25MPG. I drive 60 Miles round trip to work every day, and boost in milage would be great. I plan on addressing the O2 sensor this weekend, if it doesn't rain.

#5 Syonyk

Syonyk

    Subaru Nut

  • Members
  • 645 posts
  • Ames, IA

Posted 25 March 2005 - 01:06 AM

... a carbed engine won't have an O2 sensor. Or at least it shouldn't.

How fast do you normally drive? That makes a difference. Also, are your tires fully inflated?

I got a boost from ~23mpg to ~27mpg by changing my O2 sensor, but I have a SPFI GL, so that actually matters to it.

One thing that might help some - since you're running an aftermarket coil, you can gap the plugs a bit wider. On mine, stock is 0.044" and most people seem to suggest 0.050" works better with an aftermarket coil. I need to get around to regapping mine & see if it affects anything.

-=Russ=-

#6 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 26 March 2005 - 03:16 PM

I gapped them at .046 or .047. I also advanced the timing to match.

#7 Skip

Skip

    Flatuous Blather

  • Moderator
  • 8,991 posts
  • Latrobe, Pennsylvania

Posted 26 March 2005 - 03:47 PM

Russ needs to study a little but more.

There were many carbed cars with 02 senors

The carb and the mixture is controlled with duty solenoids
that adjust the air bled into the emulsion tubes

the 87 2 wd model will have one, 4wd do not

It still could have an 02 as no drivetrain info was given

#8 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 26 March 2005 - 06:34 PM

4WD, carbed, 4 door, wagon, no turbo, EA82.

#9 Syonyk

Syonyk

    Subaru Nut

  • Members
  • 645 posts
  • Ames, IA

Posted 26 March 2005 - 06:52 PM

*nods* I consider myself educated. Sorry!

-=Russ=-

#10 Skip

Skip

    Flatuous Blather

  • Moderator
  • 8,991 posts
  • Latrobe, Pennsylvania

Posted 26 March 2005 - 10:21 PM

Russ - no problem at all, if I do not learn something every day- I consider the day a waste - please see my signature

cd,
Russ is correct you do not have an 02 sensor nor do you have a ECU (Emission Control Unit) a.k.a. engine computer

You are at the mercy of the Subaru emission engineers, who tried desperately to make your engine pass US emissions

without the aid of any electronic control (thermo vacuum devices had to "make due")

There is one light at the end of this tunnel that is not an on coming train.

His name is Kerry, he works inconjunction with CCR Inc.

If you really want to fix this, email him - he is a true guru when it comes to this carb and it anomalies.

See this link for Rubuilders
http://www.ccrengines.com/roobuilders/


Hope this helps

#11 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 28 March 2005 - 07:50 AM

I looked under the car yesterday, there is no O2 sensor. I am now out of ideas to fix my mileage. All I have left is the exhaust, which will be done on the weekend of the 9th next month. Any other ideas would be greatly appreciated.

#12 snowstormer

snowstormer

    Eat, Live, Breath Subaru

  • Members
  • 272 posts
  • northwest wisconsin

Posted 28 March 2005 - 08:00 AM

is your car an automatic or a 5spd?

23 would be low for a 5spd, but i have had some automatic cars get that mileage, especially when going 70 down the freeway...

#13 cd45

cd45

    Eat, Live, Breath Subaru

  • Members
  • 337 posts
  • Shawnee

Posted 28 March 2005 - 11:24 AM

5 speed manual, d/r.

#14 85Sub4WD

85Sub4WD

    EA82 Junkie

  • Members
  • 1,244 posts
  • Raleigh NC/Charlotte NC

Posted 28 March 2005 - 11:29 AM

sounds like a bad carb to me too

however, I would also recommend changing your gear oil if you haven't - I did mine and picked up 2-3 mpg - but mine was VERY dirty!! (city car)




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users