im getting 19-23 mpg!!!!! HELP!!!!

I DONT KNOW HOW THIS HAPPEND BUT IM GETTING ROUGHLY AROUND 19-23 MPG!!!! it sucks. its only happened the last two full tanks. not before. i think im having an idle problem but then again i dont. my tach needle bounces up and down but the car doesnt make different noises. by that i mean the rev doesnt go up and down with the needle. i know i need to change my water pump but i dont think that would cause any of this right? the pump leaks quite a bit of water/antifreeze over night so i know for a fact i need to change it. but other than that the only thing i can think of that is causing this would be my fuel filter. from what i can tell...my idle speed is roughly around 850-1200 so i think im around stock specs lol. MY mods include

Custom CAI
MSD Blaster coil
NGK spark plugs
NGK spark wires


i had a 4g map sensor and thought that was the cause of all of this so i took it out this last time i filled up the tank. so once i run out ill have to calculate how much mpg is doing. so far so good. im at 160mi and at a third of the tank. so i dont know. what do you guys think the cause of MY problem is?



edit.
i also drive a lot. i try to shift between 3-4k and dont drive at OT. oh and by driving a lot i mean i've filled my tank twice in a day...and that was last week.

so help please...i know i should search for the idle threads but they give me a headache since they're like 400 pages long :(

ummmmmmmmmmm.

hu.


well...thats bad. i thought a jumping tach meant your dizzy is gonna crap on you. also, try shifting between 2.5-3k. just that little bit helps...i know, i drive alot too.

welcome to the club.

try a simple thing like inspecting the battery cables, both ends and cleaninng the ends that touch the battery and the battery posts. also other ground wires.

:welcome:

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Originally Posted by A20A1

try a simple thing like inspecting the battery cables, both ends and cleaninng the ends that touch the battery and the battery posts. also other ground wires.

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can this really make a difference in gas milage???`1

try this
1. inspect and may be replace distributor cap and rotor. they may look good but they can be worn out on the inside.
2. Change the water pump. You are loosing coolant. without coolant the car will go into cold start mode since fast idle valve won't be getting hot coolant. change it and fill it to the top. don't forget to bleed the system.
3. inspect your fuel filler pipe and gas tank. when you open your gas tank you should hear whooshing sound. with out pressure in the gas tank your car will run like crap. How do i know? I just went through that with my car. My gas filler pipe was rusted and it couldn't hold the pressure so my car ran like crap. I had worst gas mileage than my carbed accord back in days. So check it and may be get yourself new gas cap.
4. Inspect or replace O2 sensor. You can get universal one very cheap.

thats funny that you say the o2 sensor thing. i got the code for it about two weeks ago. havent fixed it and the check engine light went off so i didnt think much of it. it only went on for about 5 mins...after i checked the code it didnt come back on. anyway, i do have pressure in my gas tank cuz i know everytime im like on the redline of E and i open the tank it goes on for about a sec and a half. whoooooooooooooooooooooooshe! lol i suspected the rotor and cap needed to be replaced too. so i guess i have some stuff do to to my car huh.

lol

thats it im going to start another cali meet thread so people help me with my car. beer, working on a car, and friends=a good time!

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Originally Posted by mkymonkey

thats it im going to start another cali meet thread so people help me with my car. beer, working on a car, and friends=a good time!

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Sweet, maybe we can also put on my b18 manifold while we're at it.:)

i think you might have a bad o2 sensor. the code will only show up if you run the car at a steady throttle position for about 10 minutes. every time you turn off the ignition the pgmfi light will go away, so don't think the problem itself went away. the code will still be on your ecu unless you reset it.

i know that happened to me over the winter, i went from getting 400+ miles a tank to under 300. But you live somewhere warm so i doubt theres a corrolation

I was getting 283 to a tank with a20 before the trany went Bye Bye.By the way that not freeway .On the freeway i got about 450 to a tank.

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Originally Posted by gfrg88

can this really make a difference in gas milage???`1

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well if something required 12volts to run properly and only got 7 volts then there might be problems. Look at all the sensors on the car, if something isn't right with the electrical system it might think it's running lean when it isn't or give a weaker spark because of the poor connections.

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Originally Posted by B16KILLA

Sweet, maybe we can also put on my b18 manifold while we're at it.:)

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yeah and maybe we can get my car to run good :rant:

Hey guys, I decided to keep my 86 lxi sedan, As some of you know I was trying to sell it, But She has been treating me good. The only major problem I am having is horrible gas mileage. Im getting about 280 miles to a tank.
I have done major tune up in the past 2 months, Had the head rebuilt,
new plugs, wires, etc... When I first bought it the transmission was shot,
so I replaced it with an auto transmission from a 89 dx sedan. Could this have anything to do with the gas mileage ? I finallly got the T.V cable adjusted right and it shifts around 3000-3500 rpm. Also sometimes I'll be driving with the heat and a/c off , But can still feel warm air coming from the floor and If I turn the temperature down it makes the air coming through cooler. Lately it hasn't been doing that, But I thought it was weird.
I also get the code 12 bullshit all the time, I tried cleaning the egr valve, and
the egr solenoid thing in the mystery box to no avail. Other than that she runs great. I wish I could get the small shit worked out and get better gas mileage.

Quote:

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Originally Posted by mkymonkey

I DONT KNOW HOW THIS HAPPEND BUT IM GETTING ROUGHLY AROUND 19-23 MPG!!!! it sucks. its only happened the last two full tanks. not before. i think im having an idle problem but then again i dont. my tach needle bounces up and down but the car doesnt make different noises. by that i mean the rev doesnt go up and down with the needle. i know i need to change my water pump but i dont think that would cause any of this right? the pump leaks quite a bit of water/antifreeze over night so i know for a fact i need to change it. but other than that the only thing i can think of that is causing this would be my fuel filter. from what i can tell...my idle speed is roughly around 850-1200 so i think im around stock specs lol. MY mods include
Custom CAI
MSD Blaster coil
NGK spark plugs
NGK spark wires
i had a 4g map sensor and thought that was the cause of all of this so i took it out this last time i filled up the tank. so once i run out ill have to calculate how much mpg is doing. so far so good. im at 160mi and at a third of the tank. so i dont know. what do you guys think the cause of MY problem is?
edit.
i also drive a lot. i try to shift between 3-4k and dont drive at OT. oh and by driving a lot i mean i've filled my tank twice in a day...and that was last week.
so help please...i know i should search for the idle threads but they give me a headache since they're like 400 pages long :(

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130miles at 1/3 tank.... i was at 130miles at just over 1/2 tank.... thats pathetic man... and i didnt even have my o2 sensors plugged in.

But that leads me to what im going to say lol

check your o2 sensors and check your fuel filter/injectors. Run some sea-foam and make sure nothings backed up.

yeah thats actually what i think the problem is. but my problem right now is that my water pump kinda exploded. im not kidding there wes fluid everywhere! its going to the shop tomorrow. i ordered an OEM pump from honda so im waiting on that but it should get here tomorrow. after that im going to run seafoam and change the o2's. for now the car sits in my tow yard :D

Seafoam works wonders. i used it and am gettin great mileage. filled up and got almost 200 to jus over a half. at least i think it was 200..
Seafoam is real fun. Big black clouds of smoke, and a headache if you breath in:squint:

yeah i cant wait! im so excited that i just can uh....fight it!

Well just went through my first tank of gas with the b20a i put 13.5 gallons in and i got 294 miles on tank it not bad at all and that was in town driveing no freeway driveing.

Seafoam??????

im having the same problem. stuck at about 22 miles a gallon. I changed the wires plubs cap roter and ALL of the temp sensors. I did notice cyl 3 and 4 were running so rich the plugs looked fouled and 1 and 2 looked like they should except for signs of detonation. now that Ive run it for a few weeks its starting to miss again and I never got my mileage back. last year on interstate I was getting 28-29 mpg depending on speed. I do have the teg trans in mine so it wont be as good as stock mpg.

Oh yeah... I keep getting engine code 2, O2 sensor B. So I switched the plugs on the two sensors thinking if one is bad it should tell me O2 A is bad next time... Still says code 2 even after reseting ecu

alright when i was getting 20 mpg:
first, i replaced o2 sensors, got 23....i was pissed cuz i thought that was it. Then, replaced cap, rotor, and sparkplug, now im happily getting 30 on highway and 28 in city. Id say do the ignition and o2 sensors.

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Originally Posted by dillirk

Oh yeah... I keep getting engine code 2, O2 sensor B. So I switched the plugs on the two sensors thinking if one is bad it should tell me O2 A is bad next time... Still says code 2 even after reseting ecu

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if you switch the plugs then the ecu is looking at the wrong primary. so it gets signal from one sensor and then adjusts the fuel to the other two cylinders causing you to get a code real fast.