wow pal. sounds like you have a case on your hand.

 

yeah no kiddin. Can anyone tell me where the computer is located at so i can possibly try to see if it is indeed chipped.

I was also told it was possible it could be the oxygen mixture but i don't know how to test that and really don't want to take it to a shop and pay 100 bucks just to find out what the problem is.

Anyhelp is awesome, this is really burnin a hole in my wallet.

 

the computer is located in the cabin on the passenger side underneath the dash. If it were an o2 sensor you would certainly have a code.

 

There are no chips for this car. I don't see how it could be running that rich without throwing a code. Maybe the SES light has been removed? You might want to get it scanned for codes. It sounds like you've lost one or both upstream O2 sensors.

 

Sorry to steal this thread, but i have some what of the same problem. but i dont want to start a new thread when we can just add to this one.

2002 GT
68,000 miles

K&N CAI
Invidia

I too am burning a lot of fuel, somewhere around 15 mpg. I am not blowing out smoke at all, but i do have build up inside the tailpipe. And i know there is alot because i just put the invidia on about 2-3 weeks ago and just noticed today when i washed the car that its is already built up on the inside. I tried to wipe it away but it is stuck there. i also changed the plugs back in Dec.

and no, im not "chipped"

 

cap and rotor anyone?

 

nope, have not replaced them or wires, i was planning on it, but have not gotten around to it. Could that really be causing this problem?>

 

also forgot to add, at start up it sounds like fuel is just being DUMPED in. could this cause a problem as well??

 

anyone??

 

Yeah I would definitely check to see if you are throwing any codes. Also check the MAF sensor, 02 sensors, gaskets, and maybe try some fuel injector cleaner? Also did you gap the spark plugs? Just tossing ideas out there.

 

start with the basics and go from there. i work at an autoparts store and i tell everyone to go from the little stuff to the big stuff. spark plugs, wires, cap-rotor, coil, also if you are running the cheap gas put in some lucas fuel system cleaner. it will clean out any build up that you have. oh and with the tuneup thing. get the bosch platinum 2 or the bosch iridium plugs because you dont have to gap them. <-- i have them running in my car and they work great.

just some advice..

 

Any check engine lights?

 

nope. not one. i even tested the bulb, and its still good.

 

11-15mpg is about the number everyone reports when their car goes into "gimp/limp mode" (unable to establish closed loop fuel trim control). Still -- in order for that to happen, something MUST throw a code. Juice -- you have something else wrong. Sean -- we need more input.

 

okay, well after B2N would it help to check the plugs, cap, rotor. And if needed replace. If that does not solve my problem what would be your word of advice. ECU flash, re map fuel trims??? or is anything else i should do first? Fuel injector cleaner, high octane gas, reclean air filter, reset ECU??

 

Plugs, cap, and rotor can cause poor fuel economy, but usually there are codes associated with misfires that result.

Don't ECU flash unless you've already done that and screwed something up.

You should be using high octane gas anyway.

Fuel injector cleaner is good regular maintenance, but won't fix a problem. Over-use can fry your O2 sensors, especially if they're old. So will those silly octane boosters you can buy in the store.

Don't reset the ECU. Everyone always says this, and it's bad advice. It will just make it take LONGER for your computer to relearn than it will to adjust to current conditions.

 

juic, if you were closer i'd tell you to bring it to the shop i work at for diagnosis. my boss is really good at it, he'd be able to find the problem and solution, im pretty confident of it.

 

maybe after B2N i could come down. it only looks like about a 45 min drive. if i get a good deal in a fix, it would be worth it. i dont trust these shops in the city. NOT AT ALL!!! they screw me over on labor rates.

 

our rate is $85 an hour. diagnosis starts at $85 (less if its really fast to find the problem though), sometimes if its a large repair (lots of $$$) diagnosis is waived IF you buy it. if not then the most you're out is $85 for diag. you can tell us to call you if it seems like its going to take more than an hours worth of diagnosis time to find the problem so that you're not pinned with $$$$ into diagnosising a problem you cant afford to fix right now. we also do a 30 point check on the cars to look for maintence and safety problems. we're big on checking out suspension since these potholes are just tearing shit up.

 

take it to a oil change place and let em put it on the fuel system "iv drip" i did it on both my vehicles and you could smell the stuff being burned outta the engine smells like eggs. they essentially put a cleaner into the air line and it burns the crud out gave me better mpg. you could also try manually cleaning the injectors if you got the tools for it they may be squirting instead of spraying.

 

wow i dunno about those bosch highest i would go would be the plat not the 2,4 or irid 4, personally i use the ngk irids much better spark then the bosch gave. keep in mind i have been reading alot about some of the eclipses needing the ecu flashed for some tsp fix i dunno if your falls under that but check for tsps (recalls) or possably a ecu flash. i dont think that bad of a drop would be anything but maf,tps,o2,ecu. all but the ecu would throw a code.

 

Hopefully to shed some light on the issue. I have had this issue for a while now but I on the other hand know what i've done to my car to contribute to this issue. I do have my SES working and I am throwing codes for my issues. I as well avg 15-17mpg and have huge carbon build up. My issue comes from my o2 sensors not being installed properly. It has also been flashed via a tune from LogicGate (by e-mail). My codes read my car is running to LEAN (as the upstream sensors aren't correct) which i think is forcing my car to use more fuel to adapt is my guess. It also says two fuel injectors are bad as well. I think that has occurred cause of my the o2 sensor issues.

Therefore, i'm with MitsEclipseGS on this one.. check MAF, o2 sensors, and fuel injectors as i'm throwing codes for all of them =)

 

wow thanks a lot for the helpful advice, I will look into it and post if i get it resolved.

 

The only way to install them wrong is to connect a downstream sensor to the upstream plug. You could do reverse with the other sensor, but it wouldn't affect much.

 

alright so i had my friend check to see if it was throwing codes. It's throwing P0113 which the book is saying Intake Air Temp Circuit High Input. I have no clue what that means, i called the mitsubishi dealership and the service guy had no idea either. I don't know if that would cause that kind of poor fuel economy i'm getting but that's the only error it was throwing.

 

That makes sense. Without the IAT input, the ECU has no real idea of how much air is actually being ingested. I didn't know that alone could throw a car into open loop, but it seems as though it has done so for yours. Open loop is very rich.

 

i also had my car checked today, NO CODES, none. So i dont know what is going on.