Question about 1991 Mitsubishi Mighty Max

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I have a 1991 Mitsubuishi mighty max truck . The truck runs fine until I drive for about 1 mile and then the check engine light comes on and the truck starts shaking , but does not lose power.

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Hi, I own an 86 Mighty Max truck myself. Is there anyway you can get the code number for the engine light coming on. It could be many things that cause this problem. Fuel filter, EGR, Clogged Catalyst, Sparkplug Misfire, Cracked Distributor Cap, the list goes on. It needs to be determined if the problem is fuel or electrical related to help diagnose the problem.

Posted on Oct 14, 2013

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5 Suggested Answers

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  • 2 Answers

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Posted on Jan 02, 2017

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SOURCE: 1991 Mitsubishi Might Max Timing Belt

timing chain when you get a variance in timing easy to see with a timing light haynes manual should be sufficient

Posted on Jul 21, 2009

  • 523 Answers

SOURCE: Torque specs for mighty max

Per my Chilton's manual tehe bolts should be (cold engine) 65 to 72 FT. Pnds., the cam shaft bearing bolts should be 8x25 = 15 - 19 Ft pnds and the 8x65 should be 14 - 15 Ft Pnds.

The sequence is as follows for the (10 ) head bolts:

7 - 5 - 2 - 4 - 10

9 - 3 - 1 - 6 - 8

I hope this may help,
Tom

Posted on Oct 15, 2009

  • 5 Answers

SOURCE: 91 mighty max hard starting then runs great, always hard starting

could be coolant temp sensor

Posted on Oct 30, 2009

dttech
  • 4803 Answers

SOURCE: I have a 1992 Mitsubishi Mighty Max v6 3.0. It

Yes, the computer does retain fault codes. They can be retrived either with a scan tool or by using an analog volt meter. (Good luck finding one of those if you don't already own one.)
Volt meter method:
Find the diagnostic connector located next to the fuse lock under the left side of the dash
Connect the positive lead of the volt meter to pin 1 on the diagnostic connector.
Connect the negative lead to pin 12. Turn the ignition switch on and disclosure of the ECM memory will begin.
The ECM will output 12 volt pulses. There are long pulses and short pulses. The long pulses count as tens and the short pulses count as ones. Example: 3 long pulses and 2 short pulses means code 32.
If there are 2 or more fault codes in memory, they will be output one at a time in order of the code number from lowest to highest.

dttech_1.gif Code Description
_____________________________________________________
11 Oxygen Sensor or Circuit
12 Airflow Sensor or Circuit
13 Intake air Temperature Sensor or Circuit
14 Throttle Position Sensor or Circuit
15 Motor Position Sensor or Circuit
21 Coolant Temperature Sensor or Circuit
22 Crank Angle Sensor or Circuit
23 Top Dead Center Sensor or Circuit
24 Vehicle Speed Sensor or Circuit
25 Barometric Pressure Sensor or Circuit
41 Injector or Circuit
42 Fuel Pump Control Circuit
43 EGR Temperature Sensor or Circuit

Posted on Jan 22, 2011

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1 Answer

Cold auto Transmission won't shift into 3 gear until after driving 1 mile or so (driving at about 35 mgh) pickup then downshifts from 3 to 2nd then back to 3rd a few times untill I get to work (7 miles...


Sounds like a bad speed sensor. Perform an ODBII scan soon. ECU should delay upshift until coolant temp senses warm up. It will not work right unless a signal is present from speed sensor.

May 22, 2017 | 1992 Mitsubishi Mighty Max

2 Answers

I have a 1991 mitsibishi mighty max and it blows thick white smoke when I start it, why does it do that. It runs good though.


you have water/coolant entering the combustion chamber. either the head is cracked or you have blown a head gasket.

Oct 09, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

1991 MITSUBISHI MIGHTY MAX 2.4 CHECK ENGINE LIGHT COMES ON AND OFF AND WHEN IT DOES I CAN FEEL THE ENGINE CHANGE. I JUST REPLACED THE ALTENATOR AND THE MASS AIR FLOW SENSOR.


try the oxygen sensor. the heated one, when the heater burns out it causes problems. Its the one with 3 wires usually in the rear

Mar 23, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

91 mighty max wont start when cold


Next time when cold and it will not start remove a spark plug or two and see if the engines flooded. If so there are two things that come to mind; 1, worn injectors, leaking as engine sits with time causing difficult starts 2: bad oxygen sensor, if failed engines tend to run rich and the ECU may have your injectors pump heavy amounts of fuel to keep from running lean; often times you'll see poor fuel MPG if O2 sensor failed.

I hope this may have assisted you,
Tom

Oct 30, 2009 | 1991 Mitsubishi Mighty Max

1 Answer

Torque specs for mighty max


Per my Chilton's manual tehe bolts should be (cold engine) 65 to 72 FT. Pnds., the cam shaft bearing bolts should be 8x25 = 15 - 19 Ft pnds and the 8x65 should be 14 - 15 Ft Pnds.

The sequence is as follows for the (10 ) head bolts:

7 - 5 - 2 - 4 - 10

9 - 3 - 1 - 6 - 8

I hope this may help,
Tom

Oct 12, 2009 | 1991 Mitsubishi Mighty Max

1 Answer

Truck struggles to start, then runs fine until I come to a stoplight. Take foot off of accelerator & shift into neutral. Truck will not idle; cuts off & will immediately restart but not idle.


It sounds like your balance belt might be broken. I have a 1991 Mighty Max that experienced the same problem. My water pump started leaking and as I was replacing it, I discovered the balance belt was also broken after removing many parts on the front of the engine in getting to the water pump. It's a small rubber belt that turns opposite of the crankshaft to keep the engine from shaking at idle. My engine is still torn down, as I don't know how to replace the balance belt. Sure could use some advice on this repair.

Aug 10, 2009 | 1991 Mitsubishi Mighty Max

1 Answer

1991 Mitsubishi Might Max Timing Belt


timing chain when you get a variance in timing easy to see with a timing light haynes manual should be sufficient

Jul 21, 2009 | 1991 Mitsubishi Mighty Max

2 Answers

How to check engine code


try this. disconnect battery.30sec reconnect. Hold engine at idle until it idles by itself. leave idling 20min.Computer can "forget" how to idle engine if battery has been replaced or disconnected.Dunno about check engine light.May disappear after bat/dis. Otherwise check wiringconnections around engine.

May 27, 2009 | 1991 Mitsubishi Mighty Max

1 Answer

Engine light and dont run


have you checked for engine vacuum leak and tested or checked airflow meter

Oct 09, 2008 | 1990 Mitsubishi Mighty Max

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