cd45 Posted March 24, 2005 Share Posted March 24, 2005 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. Quote Link to comment Share on other sites More sharing options...
idosubaru Posted March 25, 2005 Share Posted March 25, 2005 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. Quote Link to comment Share on other sites More sharing options...
BobBrumby Posted March 25, 2005 Share Posted March 25, 2005 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? Quote Link to comment Share on other sites More sharing options...
cd45 Posted March 25, 2005 Author Share Posted March 25, 2005 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. Quote Link to comment Share on other sites More sharing options...
Syonyk Posted March 25, 2005 Share Posted March 25, 2005 ... 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=- Quote Link to comment Share on other sites More sharing options...
cd45 Posted March 26, 2005 Author Share Posted March 26, 2005 I gapped them at .046 or .047. I also advanced the timing to match. Quote Link to comment Share on other sites More sharing options...
Skip Posted March 26, 2005 Share Posted March 26, 2005 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 Quote Link to comment Share on other sites More sharing options...
cd45 Posted March 26, 2005 Author Share Posted March 26, 2005 4WD, carbed, 4 door, wagon, no turbo, EA82. Quote Link to comment Share on other sites More sharing options...
Syonyk Posted March 26, 2005 Share Posted March 26, 2005 *nods* I consider myself educated. Sorry! -=Russ=- Quote Link to comment Share on other sites More sharing options...
Skip Posted March 27, 2005 Share Posted March 27, 2005 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 Quote Link to comment Share on other sites More sharing options...
cd45 Posted March 28, 2005 Author Share Posted March 28, 2005 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. Quote Link to comment Share on other sites More sharing options...
snowstormer Posted March 28, 2005 Share Posted March 28, 2005 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... Quote Link to comment Share on other sites More sharing options...
cd45 Posted March 28, 2005 Author Share Posted March 28, 2005 5 speed manual, d/r. Quote Link to comment Share on other sites More sharing options...
85Sub4WD Posted March 28, 2005 Share Posted March 28, 2005 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) Quote Link to comment Share on other sites More sharing options...
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