Question about 1990 Mitsubishi Mighty Max

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Engine light and dont run

I have a 91 mighty max with fuel injection. the truck runs great until it gets warm and the engine light comes on and the the truck revs up and down and will only tac about 1000 rpms. changed plugs, wires, cap, and button. i have also changed fuel filter and gutted the catalytic converter. any suggestions or does anyone know how to get the codes for the check engine light?

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  • cwj83 Oct 12, 2008

    yes no vacuum leaks.

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

Posted on Oct 09, 2008

  • tony yeatman
    tony yeatman Oct 13, 2008

    Is the pcv working .Not sure with your model but its usualy located on the top of the rocker cover .pull it out with the engine running engine should react to valve bieng removed also with engine running put your thumb on and off the end of the valve if no reaction you need to replace.the reaction should not be a delayed reaction.how did you check for the vacuum leak?

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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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Where is the fuel filter on 1993 mighty max


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Jan 21, 2012 | 1993 Mitsubishi Mighty Max

1 Answer

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Hello brian..these are great little trucks, i have a 87 (hitachi carb) with over 300k on it---still going strong and gets good mileage. Sounds like a fuel delivery problem on yours--- You can test the fuel pressure and the pressure regulator with a manual gauge...autozone has loaner tools if you dont have a fuel pressure tester. You should have aprox 36 psi ---remove the vacuum line on the pressure regulator with the engine running, the pressure should come up about 5-10psi, if it dont the regulator is bad. (Make sure there is vacuum on that hose) Make sure the MAF sensor is clean, if dirty clean it with MAF sensor cleaner, don't use brake cleaner.

Check for vacuum leaks around the manifold and emissions hoses...a good way to do this is with carb cleaner...spray it on the areas you are checking, it engine rpm change, you found the leak.
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I hope this helps & good luck with your mighty max.

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you can get pressure specs from your local parts dept, and check injector signal with a noid light

Apr 23, 2010 | 1991 Mitsubishi Mighty Max

1 Answer

91 mighty max wont start when cold


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I hope this may have assisted you,
Tom

Oct 30, 2009 | 1991 Mitsubishi Mighty Max

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