Question about 1990 Mitsubishi Mighty Max

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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.

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dustyboner
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SOURCE: mass air flow sensor

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Posted on Oct 18, 2008

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  • 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

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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....."

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1 Answer

Rough idle and smells like gas when driven


When checking for Vacuum leaks, did you use a water spray bottle on seams and vacuum lines and EGR pod?(engine running)

Check for air leaks in exhaust before O2 sensors. O2 thinks its running lean from air leak in exhaust header and enrichens fuel charge.

Fuel injectors dirty, not closing tight. Switch injectors to other bank and see if Error Code moves to relocated injectors.

Bad spark plugs, check if you have fuel runners in your intake.

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1988 ford ranger 2.3l 5spd 2wd. Exhaust pipe tip is black. Fuel mileage is 13mpg. Replaced fuel filter; 8 plugs and wires, o2 sensor,thermostat,air filter,egr valve,cleaned iac and intake,ran sea foam...


The regulator is on top of the engine along the gas line. It has a vacuum line on top. Start the truck and pull the vacuum line off the regulator. If fuel comes out of the regulator, it has failed. You can run pretty rich with a busted regulator-especially at idle.

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How to find codes for check engine light on


Check Engine Light Codes and Meanings
Long blinks Short blinks Problem
1 1 Camshaft position sensor
1 2 Mass air flow sensor
1 3 Engine coolant temperature sensor
1 4 Speed sensor
1 11 EVAP control system (flow)
1 14 Fuel injection system right bank (too rich)
1 15 Fuel injection system right bank (too lean)
2 1 Ignition circuit
2 3 Closed throttle position switch
2 5 Idle speed control
2 9 Fuel Injection system left bank (too rich)
2 10 Fuel Injection system left bank (too lean)
3 1 ECU
3 2 Exhaust gas recirculation system flow problem
3 3 Front left O2 sensor
3 4 Knock sensor
3 5 Exhaust gas recirculation temperature sensor
3 6 EGRC-BPT valve
3 7 Closed loop control
3 8 Closed loop control
4 1 Air intake temperature sensor
4 2 Fuel tank temperature sensor
4 3 Throttle position sensor
4 7 Crankshaft position sensor
5 3 Front right O2 sensor
5 4 Automatic transmission control unit
6 3 Cylinder #6 misfire
6 4 Cylinder #5 misfire
6 5 Cylinder #4 misfire
6 6 Cylinder #3 misfire
6 7 Cylinder #2 misfire
6 8 Cylinder #1 misfire
7 1 Multiple cylinder misfire
7 2 Three way catalytic converter (right side)
7 3 Three way catalytic converter (left side)
7 4 Evaporative emission control system pressure sensor
7 5 Evaporative emission control system
7 7 Rear O2 sensor
8 1 Vacuum cut valve bypass valve
8 2 Crank position sensor
8 3 Absolute pressure sensor
8 4 Automatic transmission control unit
8 6 Evaporative emission canister purge control solenoid valve
8 7 Evaporative emission Canister purge control solenoid valve circuit
9 1 Front Right O2 sensor
9 3 Evaporative emission Canister vent control valve
9 5 Crankshaft position sensor
9 8 Engine coolant temperature sensor
10 1 Front left O2 sensor
10 3 Park and Neutral position switch
10 5 EGRC solenoid valve
10 8 Evaporative emission canister purge volume control valve
11 1 Inhibitor switch
11 2 Revolution sensor
11 3 Improper shifting to first gear (Automatic transmission)
11 4 Improper shifting to second gear (Automatic transmission)
11 5 Improper shifting to third gear (Automatic transmission)
11 6 Improper shifting to fourth gear (Automatic transmission)
11 7 Solenoid valve lock up function
12 1 Shift solenoid B (Automatic transmission)
12 3 Overrun clutch solenoid valve (Automatic transmission)
12 4 Torque converter clutch solenoid valve (Automatic transmission)
12 5 Line pressure solenoid valve (Automatic transmission)
12 6 Throttle position sensor (Automatic transmission)
12 7 Engine speed signal
12 8 Fluid temperature sensor
13 2 MAP/BARO Switch Solenoid Valve
13 5 Fuel pump control module
13 8 Cooling fan

Dec 12, 2011 | 1995 Nissan Maxima

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

1990 300 zx starts fine though sometimes rich. Won't restart when driven and turned off. Replaced fuel regulator/fuel damper/plugs & iar filter.Getting fuel & spark.If I restrict(crimp) fuel line...


Sounds like you have a problem with the coolant temp sensor, could be sensor or wiring. The coolant temp sensor tells the computer how warm the engine is so that it know how to adjust the mixture, a cooler engine needs more fuel. If the sensor or wiring is messed up, the computer gets a signal that the engine is very cold and the computer gives full rich to the injectors.

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2 Answers

My 88 Oldsmobile Cutlass Ciera is running rich and


The Oxygen sensor is very suspect. it is easy to damage on install, even with the correct tool.

Put the old one back in and test the car...

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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

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1 Answer

Intermittant chugle(idle),poor throttle response


your hetred o2 sensor is also what some manufacturers call a fuel/ air metering sensor, primarily because this is exactly what it does. with a faulty 02 sensor the computer doesn't know if the engine is running rich or lean, there for causing a rough idle, repair this as quickly as possible because damage can be done to the catalytic convertors. this can cost upwards of 1000 bucks to replace depending which engine. no matter which engine you have, replace both o2 sensors in the bank that is causing the problems, this is more important with the gm line than most but holds true to all vehicles

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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


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Oct 07, 2009 | 1990 Ford Ranger SuperCab

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