Question about 1991 Mitsubishi Mighty Max

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What problems arise with a faulty "Control Module" which on my "91" Mitsubishi mighty max it's located inside the distributor it's self ? Also I believe that when it's getting hot ,it's breaking down and causing the engine to to pop ,hiss and spit .Is my diagnose correct and also I tried getting the cap off under the roto button and it seems that it's all built together which means I have to buy the whole distributor right? Thanks please someone help me with this .

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I would suggest it may be your fuel pump. If the vehicle runs fine when it is cold but after it gets hot it lugs up hills, backfires and seems like it has no power. I would replace the fuel pump this is just a suggestion. Hope this helps tim

Posted on Aug 25, 2010

Testimonial: "Thanks Tim for that is something that I had also thought of as being the problem . I will check that also and Thanks again ."

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91 Mitsubishi mighty max drive belt diagram


if it's not on the sticker under the hood then look in a Chiltons manual for your truck.

May 14, 2014 | 1991 Mitsubishi Mighty Max

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I have a 1990 mitsubishi might max it wont run smooth unless you keep your foot on the gas and keep the rpms up a little bit and it wont drive cause it stalls everytime you try to move it. ive replaced the...


You've already eliminated the spark plug & wireset, distributor cap & rotor.
Sounds like your car needs a tune-up, specifically, the PCV (positive crankcase ventilation) valve, and/of the EGR (Exhaust Gas Recirculation) valve.

Components checked/replaced during a tune-up are:
air filter
motor oil
motor oil filter
breather filter
fuel filter(s)
fuel strainer
PCV valve
EGR valve
spark plugs
spark plug wires
ECM or distributor cap & rotor
cabin air filter
transmission oil filter
transmission oil
engine coolant
check all vacuum hoses and lines

Troubleshooting the no-start condition - from the 1990 Mitsu Mighty Max Repair Manual:

Priority Action Part Type -- Cause
1 Inspect Battery -- Battery Discharged or Faulty.
2 Inspect Battery Cable -- Corroded, Broken, Shorted or Poorly Connected Battery Cable.
3 Inspect Distributor Cap -- Distributor Cap Cracked or Burned.
3 Inspect Fuel Filter -- Clogged or Dirty Fuel Filter.
5 Inspect Ignition Coil -- Faulty Ignition Coil.
6 Inspect Wireset -- Worn, Damaged or Faulty Spark Plug Wire(s).
7 Inspect Spark Plug -- Incorrectly Gapped or Fouled Spark Plug(s).
8 Inspect Starter -- Starter Motor Faulty.
9 Inspect Fuel Pump -- Low Fuel Pressure.
10 Inspect Solenoid Switch -- Faulty Starter Solenoid Switch.
11 Inspect Fuel Pump Relay -- Faulty Fuel Pump Relay.
12 Inspect Fuel Injector Pressure Regulator -- Faulty Fuel Injector Pressure Regulator.
13 Inspect Ignition Switch -- Improperly Connected or Faulty Ignition Switch.
14 Inspect Starter Drive -- Faulty Starter Drive.
15 Inspect Fuel Injector -- Dirty or Worn Fuel Injectors.
16 Inspect Fuel Pump Strainer -- Clogged or Dirty Fuel Pump Strainerat.
17 Inspect Engine Control Computer -- Incorrect Operating Information Being Delivered and Sent From The EEC.
18 Inspect Fuel Tank -- Fuel Tank Empty.
19 Inspect Carburetor -- Carburetor Flooded or Faulty Choke.
20 Inspect Distributor -- Worn, Loose, or Incorrectly Installed Distributor.

Aug 17, 2011 | 1993 Mitsubishi Mighty Max

1 Answer

I appreciate the last answer about installing a new distributor on my "91" Mitsubishi Mighty max 2.4 but was not the answer I was looking for so I will re word it .The firing order part I know ,it's the...


I believe what he is telling you is to put a mark on the motoor something to reference where the rotor in the distributor is pointing.
This way when you put the new one in, you can make sure the rotor is pointing the same way and not mess up the timing. Only problem with this, if you are not exact and drop it one tooth offm it will not run right.

Aug 26, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

What problems arise with a faulty "Control Module" which on my "91" Mitsubishi mighty max it's located inside the distributor it's self ? Also I believe that when it's getting hot ,it's breaking down...


If the Might Max has a 3.0 V6 then the distributor uses several small LED lights wthin it and a spinning disc with small holes in it as the disc spins the the light briefly passes thru the holes calling on the ECU to spark or injector pulse; I do no think this may be rebuilt. However given the year of the truck my money is on the ECU failing (the capacitors on early 90's mitsubishi will leak and fail) You can read the ECU by use of a small connector near it and using a standard analog volt meter.
Please let me know if I may assist further.
Best regards,
Tom

Aug 25, 2010 | 1991 Mitsubishi Mighty Max

2 Answers

What's the firing order for a 1990 Mitsubishi Mighty Max (4.banger)?


1990 Mitsubishi Truck Mighty Max 2WD 2.4L FI 4cyl
The Firing Order mitsutrk01:
Firing order 1-3-4-2 --------- front | | of | 1 2 3 4 | Distributor rotates clockwise vehicle | | ---------

1990 Mitsubishi Truck Mighty Max 4WD 3.0L FI 6cyl
The Firing Order mitsutrk04:
Firing order 1-2-3-4-5-6 ------- front | 1 3 5 | of | | distributor rotates counter vehicle | 2 4 6 | clockwise -------


Hope help with this (remember rated this help).

Mar 12, 2010 | 1989 Mitsubishi Mighty Max

1 Answer

Put in distributor for 1991 mitsubishi mighty max


Please confirm which engine your truck has; 3.0 V6?

Thanks,
Tom

Feb 28, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

I NEED TO KNOW WHERE THE HOSE THATS UNDER THE CHARCOL CANISTER GOES TO ON THE 91 MITSUBISHI 2.4L TRUCK.


That vacuum line goes to the purge control solenoid valve. I believe it will be located on either the firewall or on fender near canister

Hope that may have helped,
Tom

Jan 01, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

Computer in 1991 mits pick up


I recently replaced the ECU in my 91 mighty max. If you remove the glove box you will see it on the right hand side.

Feb 28, 2009 | 1991 Mitsubishi Mighty Max

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