Running Lean, CEL codes thrown.

[dsmornothing]

Alright, according to my Air Fuel gauge (not wideband) i am running fairly lean. I have thrown several codes and i believe they might be linked together in this problem

P0170-Fuel trim bank 1
P0141- O2 bank 1 sensor 2 (no cat)
P0115 -Coolant Temp Sensor
P0110 -Intake Temp
P0105 -Manifold Absolute Pressure
P1500 -Speed, Idle, Aux
P1104 -Fuel And Air Metering

So far, I cleaned my MAF, Seafoamed the engine, Cleaned all Connections. And still nothing. Also When i am going down the road, sometimes when i get on it, its like i hit a rev limiter and it starts spitting and sputtering. I am lost. Please help!

 

[cookmeup272]

If you want to effectively know if you are lean or not you need a wideband. When i had one of the junk narrowband gauges, it would should fairly lean when really wasn't. Also go to autozone and rent the scanner, takes 2 mins to plug it in and find out exactly what code is being thrown

 

[dsmornothing]

If you want to effectively know if you are lean or not you need a wideband. When i had one of the junk narrowband gauges, it would should fairly lean when really wasn't. Also go to autozone and rent the scanner, takes 2 mins to plug it in and find out exactly what code is being thrown

I own a scanner, and i listed all of the codes being thrown

 

[gringo72884]

seems like your front oxygen sensor is bad as well as your coolant temperature sensor. Start out by replacing those two, they should eliminate the majority if not all of your CEl's. I recently change my front o2 sensor and I can assure you it will definitely take care of that fuel trim and o2 sensor bank 1 CEL

 

[dsmornothing]

seems like your front oxygen sensor is bad as well as your coolant temperature sensor. Start out by replacing those two, they should eliminate the majority if not all of your CEl's. I recently change my front o2 sensor and I can assure you it will definitely take care of that fuel trim and o2 sensor bank 1 CEL

Front O2 sensor was changed 1400 miles ago with an NTK. Also its bank 1 sensor 2 so the sensor after the cat.....i have no cat so thats why its throwing that.

 

[gringo72884]

the mileage plays no factor at all, 2G and even 1G's almost exclusively work best with OEM oxygen sensors. Trust me I've tried my share of aftermarket o2 sensors on my 1G and 2G and have had them all prematurely fail. Get yourself a 2G OEM o2 sensor and you'll be good to go. As for the bank 1 o2 sensor CEL it should not be on regardless if your not running a CAT as long as you have the rear o2 sensor plugged in and it is working properly. I am running no cat on my 2G and left my rear o2 sensor plugged in and it has NEVER thrown a CEL.

 

[dsmornothing]

the mileage plays no factor at all, 2G and even 1G's almost exclusively work best with OEM oxygen sensors. Trust me I've tried my share of aftermarket o2 sensors on my 1G and 2G and have had them all prematurely fail. Get yourself a 2G OEM o2 sensor and you'll be good to go. As for the bank 1 o2 sensor CEL it should not be on regardless if your not running a CAT as long as you have the rear o2 sensor plugged in and it is working properly. I am running no cat on my 2G and left my rear o2 sensor plugged in and it has NEVER thrown a CEL.

Well i went on your advice and put my fully functioning stock o2 sensor back in AND cleared the ECU still threw all the same codes....

 

[tallywacker]

Well i went on your advice and put my fully functioning stock o2 sensor back in AND cleared the ECU still threw all the same codes....

Why did you replace it if it was fully functioning? How long have you been having this codes? Was it immediately after installing that new o2 sensor? Also have you verified all the wiring is in good condition? You need to add more to what happened, and throwing 5 codes at once seems very odd.

 

[twdorris]

Perhaps you have a blown sensor ground.

Thomas Dorris

 

[dsmornothing]

Why did you replace it if it was fully functioning? How long have you been having this codes? Was it immediately after installing that new o2 sensor? Also have you verified all the wiring is in good condition? You need to add more to what happened, and throwing 5 codes at once seems very odd.

No it was not right after, i replaced it because i got the NTK one as a freebie brand new still in the box. I recently rebuilt my transmission so the car sat on the lift for a period of time and this started happening right after i got it running again....I Just disconnected the battery again and am going to let it sit for an hour, maybe something will clear.....

 

[jeffo]

You need to Google those OBDII codes for ones that are Mitsubishi specific. The descriptions you listed are too generic. For example:
P1104 - actually means that your wastegate solenoid is bad/unplugged from the harness
P1500 - actually means that there is a bad connection between the ECU and the alternator.
P0105 - actually appears to be an issue with the BARO sensor, which is part of the MAS, as is the IAT sensor code P0110 you listed.
As Tom suggested, these might all be caused by a blown sensors ground inside the ECU. Did you check his link?

 

[alex1090]

Usually if you have no cat and 2 known good O2 sensors, you will get a cat efficency code rather than an O2 sensor code. So I would have to say its not the sensor

Correction- I meant to say it is probably the sensor, or wiring