Question about 1994 Mitsubishi Mighty Max

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Mitsubishi mighty max 1994 v8 idle issue

My tuck has 170000 miles and it has had a few issues my idle has varied day by day and start by start sometimes being really high and others low and cuts out low to lower then back. im not sure if this is some computer or idle sensor of some kind, the fan and belts get loud at times when its running and it was running perfect and steady at one point then it started to cut out lox again, if you have any suggestions id appreciate it.

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  • 30 Answers

Have u checked to make sure that a vacum pipe hasent come off and the engine is taking on seconry air making it idle roughly .

Posted on Jan 12, 2013

  • Keegan Perea
    Keegan Perea Jan 12, 2013

    yes i havent found anything unsecured, could this be timing belt or maybe a belt issue ? any other suggestions?

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Posted on Jan 02, 2017

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SOURCE: Timing Belt for 2004 Mitsubishi Endeavor

Yes, I would replace it according to the owner's manual. Could be very expensive if it breaks.

Charlie

Posted on May 31, 2009

  • 740 Answers

SOURCE: My service engine soon light is on on my 2004 Mitsubishi Lancer.

You can't guess with this vehicle take it to Auto-Zone they will check the code for free and get back to me. Good Luck

Posted on Dec 20, 2008

  • 1 Answer

SOURCE: 2003 Lancer ES High pitch squeal and constant squeak

Shortly after replacing the serpentine belt in my lancer, the same thing happened. It is NOT the timing belt. Belts squeal when they slip. If your timing belt slipped it would cause your car to run funny.

have somebody check the belt for wear (or do it yourself), replace if necessary. If it doesn't need replacement, just tighten it.

If you have the 4cyl engine that I have, the tightening is kind of a pain in the ****. Not a great design by mitsubishi. There's a pulley near the front right corner of the engine in front of the alternator. the belt should be running around this pulley GROOVE SIDE OUT. This is the tension pulley.

To tighten:
1) Lightly loosen the bolt in the center of the pulley (slightly loosen, DO NOT REMOVE).
2) Under that pulley there's another bolt. You can see that the bolt goes through a piece of metal
attached to the back of the pulley. Figure out which way you need to turn the bolt to move the
pulley toward the front of the car. (i don't remember if it's right hand thread, or left hand) This
puts extra tension on the belt. You probably don't need much. Over tensioning the belt can
cause pulley bearing failure. If you haven't done this work before, ask someone for
help
. It's better to tighten a little bit, a few times rather than overtighten once.
3) Don't forget to ReTighten the bolt in the center of the pulley.

If there's lots of cracks and pieces missing on the ribs or grooves of the belt you should replace it first.

Happy repairing,
Cliff

Posted on Mar 09, 2009

  • 1071 Answers

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

  • 5 Answers

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

could be coolant temp sensor

Posted on Oct 30, 2009

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Mitsubishi mighty max 3.0 v8 loud noise coming from the fan area


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Jan 12, 2013 | 1994 Mitsubishi Mighty Max

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How do you check for trouble codes on a 1994 Mitsubishi Mighty Max p/u


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Aug 08, 2012 | 1994 Mitsubishi Mighty Max

1 Answer

1994 Mitsubishi Mighty Max, 2.4 injected. Truck would start but idle way up then down almost stalling. After warmed up it would idle decent and drive, but under load it had no "pull" and...


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.
Also check the coolant temperature sensor, if it is out of range it will send a false signal to the engine controller, the controller will not open the injector circuit to squirt enough fuel under a load.

I hope this helps & good luck with your mighty max.

Aug 27, 2011 | 1995 Mitsubishi Mighty Max

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How many miles?
Could be a bent pushrod.
Could be just a high mile engine that needs overhauld.
Could be you engine needs higher octane fuel...as engines get older and worn they will benifit from higher octane.

Sep 14, 2009 | 1994 Mitsubishi Mighty Max

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