Question about 1991 Mitsubishi Mighty Max

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I'm doing a valve job on my 1991 Mitsubishi mighty max v6 3.0L 4x4. I recently replaced my ECU the truck sat in the woods for 5 years so im wondering what I should I replace while I have it apart. Altogether I have replaced the fuel filter, fuel, oil and ECU because it was bad. What else should I replace? Thanks in advance!

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The problem with the truck sitting so long with any amount of fuel in the tank is that it turns into varnish. You may have to drop the fuel tank to make sure it is clean. Also the fuel pump may be locked up from the varnish. Make sure all the fuel lines are clear before you reconnect them. You may have problems with the injectors too. I am guessing this is a fuel injected engine? If not, you may only have to clean out the tank, fuel lines and carburetor.

Posted on Oct 03, 2010

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  • Nick Vellis Oct 03, 2010

    Yes this is a fuel injected truck. I Drained the fuel tank so it wouldn't get in the system. I will check my tank for rust. Should I just do the regular maintenance to make sure this truck is reliable and runs well?

  • Bryan Neff Oct 03, 2010

    There shouldn't be any rust in the tank as long as it was closed up. Hopefully the pump didn't get varnished up sitting that long. I would just do the regular maintenence. I would only put in 5 gallons of gas to check the pump out for sure. Pumps aren't cheap, So it doesn't hurt to check. If it's an auto trans I would change that fluid too. Oil like gas does go bad sitting for too long.

  • Nick Vellis Oct 03, 2010

    Yeah when i changed the oil it had fuel in it. Thanks for your help!

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Hi i have a 1991 Mitsubishi mighty max 3.0L 4WD. I just got it running today. Its making a ticking noise when idling. I think it was doing this before but im not shure. I dont want to damage anything. I...


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Apr 23, 2010 | 1991 Mitsubishi Mighty Max

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No Fuel??? Not starting.


You have fuel flow but the question now is are the injectors pulsing. Given the year of the truck my gut says your ECU, Engine Control Unit, has failed. Mitsubishi had issues with the capacitors in their early 90's cars, trucks SUVs. I have been thru this with two monteros and one 3000GT, very common. To check your injectors rent a set of NOID lites from Autozone our such. Remove an injector plug and itstall a noid light. Turn the engine over, if no flash, no pulse. Remove the ECU and carefully open it up. Look for the capacitors, there should be 3, look under the capacitors on the board; if there is a grease like substance, often time it has a green hew to it, then the capacitor(s) have failed. It may be possible to replace the capacitors or simply purchase a rebuilt ECU. Be ceratin the MD number matches on the new unit.
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1 Answer

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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.

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7 - 5 - 2 - 4 - 10

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I hope this may help,
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Does not have adjustable valves . It has hydrolic valve lasher's . they are spring loaded ( i believe ) . I just replaced them in mine . valve giude seal's where worn out causing it to smoke realy bad ( looked like a mosqito truck ) and the valves where ticking , due to the hydrolic valve lash adjuster's being worn out . They are about $ 8 - 10 buck's each at advance .

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If it is 4X4 and you re not going far. Put the transfer case in neutral. If it is 2X4 standard transmission, put it in neutral. If it is an automatic transmission you need to remove the driveline.

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