Question about 1990 Mitsubishi Mighty Max

Open Question

1990 M. Max 2.4 runs rich off idle.

Have a 1990 M. Max 2.4l , no air, manual trans 2wD.The O2 sensor switches fine at an idle but off idle whether parked or driven it goes to .9 V, rich condition. Checked dilution by disabling PCV and evap system is okay. The only thing left may be mass air flow, but I'm hoping for something else cheaper to replace.

Posted by on

6 Suggested Answers

dustyboner
  • 329 Answers

SOURCE: mass air flow sensor

<SOHC, Federal - Non Turbo,Canada - Non Turbo>

1d0cd9b.jpg ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------=====================================================================================================================================

<California - DOHC Non Turbo, Turbo>


c4dfca0.jpg

Posted on Oct 18, 2008

  • 1 Answer

SOURCE: idle surging chugging weird problem READ!!

hey common problem w/the 2000 galant. you may need a mirror to see this, look and or feel where your throttle body mates up to your intake manifold. it has a problem of cracking, when you have an air leak there it will run like **** and usually shut off depending on the severity. this will cause you to get the throttle position malfunction code. if that is the case instead of buying a new or used intake manifold. take the old one off, and you can actually cut it flush and weld about a 2 inch in length tube to repair the crack. well let me know how it goes.

Posted on Feb 01, 2009

  • 9 Answers

SOURCE: Will not pass inpection, 5 sensors not ready--V6 3.0

Drive the car for 2 miles non-stop and take it to smog inspection WITH OUT TURNING OFF THE CAR!! the key is that the car goes threw the test while the engine is running ...

if the car is turned off ... u will have to repeat procedure ...

Posted on Apr 17, 2009

garputo22
  • 127 Answers

SOURCE: iv changed everything on this kia sephia

crankshaft position sensor

Posted on Jun 05, 2009

  • 19 Answers

SOURCE: My 2004 Ford Expedition 4.6l has a rough idle and

"My 2004 Ford Expedition 4.6l has a rough idle and occasionally backfires."

Sounds like you have bad spark plugs or incompatible spark plugs in the vehicle check to see if all the spark plugs are good(could have detective spark plugs even if they're new -- cheap spark plugs are usually the problem)...and use OE specify spark plugs or buy from dealer.

Posted on Sep 22, 2009

Testimonial: "thanks.....but on the back of the intake, the hose connected to the pcv valve was melted on the back side....."

  • 168 Answers

SOURCE: runs rich on bank one and lean on bank 2

have it checked for compresion you may have a head gasket problem are any of the plugs green on the tip

Posted on Dec 09, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Idles up and down when cold as warms up idles fine.tried 2 othyer air intake control mod. still does same thing.02 sencor code is only code comes up couldthis be my idle problem/


Check the IAC idle air control, you need to remove it and clean with carb. cleaner, after 35 years of working on cars, this is your problem, the o2 sensor is at the back end of the emission system, a lean or rich condition triggers the o2 sensor, when the IAC is not working correctly it is creating a lean condition (to much air)

Aug 24, 2011 | 1995 Honda Civic

2 Answers

What's the problem of my mitsubishi mighty max the gas mileage is 10 miles a galloon?


can you smell raw fuel when the vehicle is running? smell the exhaust when its idling.. if it smell like fuel really strong, you need to replace o2 sensor.. the o2 sensor is what tells the vehicle the air/fuel mixture, thus if one is bad it will either run rich (uses too much fuel) or lean (dont get enough fuel) hope this helps.. also check out the fuel press. regulator if your vehicle is equiped with one.. the o2 sensors will usually kick the check engine light on.

Dec 10, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

My truck began running very rich little by little.


FROM WHAT I FOUND OUT ON MY SAME TRK ONLY 94' IS THE DIAPHRAM ON THE FUEL PRESSURE REGUALTOR IS SLUGGISH OR BLOWN. DISCONNECTING THE VACCUM LINE AND PLUGGING THE MANIFORD PORT HAS HELPED UNTIL I AM ABLE TO AFFORD THE REGULATOR. TO HELP CLEAN THE OXY SENSOR, SPEED UP THE IDLE AND DISSCONNECT THE BRAKE BOOSTER VACCUM LINE AT THE ENGINE. THE FRESH AIR WILL SOMEWHAT HELP CLEAN THE SENSOR IF IT IS ABLE TO BE HELPED. I AM TOLD THAT THE OXY SENSOR ON THESE MODELS IS CRIDICAL. JACK

May 13, 2010 | 1986 Nissan Pickup 4WD 1986

1 Answer

I have a 1990 Jaguar Sovereign, 98,000 miles. The problem I'm having is the engine starts and runs, but it lopes at idle and runs rough, seems to be running too rich. I was getting fault codes 44, 37,...


I would change the air filter and clean the fine mesh covering the air flow control unit.
Make sure the connections are good as the sensor screen is tied to the O2 sensor. A new O2 sensor and dirty screen would give you poor fuel burning as the air fuel mix would be bad, and the O2 sensor would read the need for more fuel.......poor economy and running rough as it would not be clean burning.

Apr 26, 2010 | 1990 Jaguar XJ6

1 Answer

Have replaced about all relays and sensors plugs and wires fuel pumps egr valve and solenoid eec relay tps sensor air charge sensor o2 sensor coolant sensor have in my hand knock sensor havent put in yet...


i think i would check the fuel presure regulator and the fuel presure if fuel presure low look at fuel filter if rail not holding presure then look at fuel presure reg and vac conection on it

Jan 23, 2010 | 1986 Ford Ranger 2WD

2 Answers

Jaguar xj6 4.0 1990. showing fault code fuel 14, fail 14. what does this code mean ?


2 airflow sensor out of operating range 3 coolant temp sensor out of operating range 4 oxy sensor indicates full rich 5 throttle potentiometer/airflow sensor... (low throttle pot signal with high airflow sensor signal) 6 throttle pot/airflow sensor...... (high throttle pot signal with low airflow sensor signal) 7 throttle pot...idle fuel adjustment failure(idle speed??) 8 intake air temp sensor...open or shorted circuit to sensor 11 Throttle pot at idle: Throttle pot idle trim out of normal range 12 Airflow meter: MAF signal out of range 14 Coolant thermistor: Resistance out of range or static during engine warm up 16 Air thermistor: Resistance out of range 17 Throttle pot: Out of range 18 Throttle pot/Airflow: Low throttle pot signal at high airflow 19 Throttle pot/Airflow: High throttle pot signal at low airflow 22 Fuel pump drive: ECU output to fuel pump relay 23 Fuel supply: Engine running too rich 24 Ignition Drive: ECU output to ignition Amp 26 Air leak: Engine running too lean 29 ECU self check 33 Injector Drive: ECU output to injectors 34 Injector: Looks for Injector dribble 37 EGR Drive: ECU output to EGR switching valve 39 EGR check sensor: EGR not working (normally pipe blocked) 44 Lambda (O2) sensor: Poor mixture control rich or weak (or misfire) 46 Idle speed Control valve: ECU output to Coil AB 47 Idle speed Control valve: ECU output to Coil CD 48 Idle Speed Control Valve: Stepper motor grossly out of position 66 Air pump: ECU output to air pump relay 68 Road speed sensor: Seen speed < 5km/h at high engine airflow 69 Drive/Neutral switch: Seen cranking in "D" or high airflow in "N" 89 Purge Valve drive: ECU output to purge valve
this is all I could find

Nov 09, 2009 | 1990 Jaguar XJ6

2 Answers

My 1990 ford ranger when the motor is cold it runs fine but when it warms up it spits and sputters so bad it barley runs


Check the egr valve. Then the O2 sensor(s). When it warms up it goes into "closed loop" using the O2 sensors..if bad it will run lean or rich or hunt for both.

Oct 07, 2009 | 1990 Ford Ranger SuperCab

1 Answer

O2 sensor problem, running rich. Please help


was the code for rich or lean? may try cleaning mass air flow sensor. it is in the air intake tube and has a flat wire connector. take out of tube and take four torx bolts out and clean with mass air flow cleaner or brake cleaner and put back in when dry. or it could be a bad wire on the o2 harness. look for chaffing or broken wires in harness by o2. also could be the exhaust system has a slight blockage. could also be some other things but try these first.

May 07, 2009 | Chevrolet Silverado 2500 Cars & Trucks

Not finding what you are looking for?
1990 Mitsubishi Mighty Max Logo

Related Topics:

58 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mitsubishi Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Mitsubishi Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...