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Anonymous Posted on Aug 26, 2014

1991 mitsubishi mighty max 2.4 has no injector pulse why?

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Randy

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  • Posted on Aug 26, 2014
Randy
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Joined: Nov 29, 2009
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It could be that your crank sensor is bad or your ecm. your crank sensor sends a small amount of voltage to your computer telling it that you are trying to start your engine the computer in turn sends a signal to the injectors telling them to pulsate because you are trying to start the engine but if your crank sensor is bad and sends no voltage signal to your computer your computer doesn't know you are trying to start your engine therefore it doesn't send the signal to your injectors telling them to pulsate. If your crank sensor is sending a signal to your computer then your computer is not sending the signal to your injectors more likely a grounding issue through the computer I have seen this before let me know how it goes.

5 Related Answers

Anonymous

  • 131 Answers
  • Posted on Jul 10, 2008

SOURCE: 1991 mighty max

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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Anonymous

  • 39 Answers
  • Posted on Jan 28, 2009

SOURCE: 95 mitsubishi mighty max main required light

If you are speeking of the check engine light you can disconnect the battery for a few minutes then reconnect it and the light should go off.

Anonymous

  • 523 Answers
  • Posted on Oct 15, 2009

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

Anonymous

  • 523 Answers
  • Posted on Apr 27, 2010

SOURCE: put in distributor for 1991 mitsubishi mighty max

Please confirm which engine your truck has; 3.0 V6?

Thanks,
Tom

Anonymous

  • 232 Answers
  • Posted on Mar 11, 2011

SOURCE: 1991 mitsubishi mighty max want

if this is carb motor than it needs a manual choke that mounts on inside of lower dash, the kind you see on lawn mowers,,,push and pull.

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What is the torque for installing the crankshaft for the 2.4 mitymax motor?

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Why 1991 mitsubishi mighty max has no injector pulse 2.4 engine?

The problem may be a cam/crank position sensor that is causing this. Check that the cam shaft is turning ( broken timing belt/chain)
0helpful
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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...

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
1helpful
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1991 Mitsubishi Mighty Max 2D 4X4 V6 3.0L No Start.

you can get pressure specs from your local parts dept, and check injector signal with a noid light
2helpful
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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.
Please let me know your results and if this had assisted you.
Thanks, Tom
0helpful
1answer

Put in distributor for 1991 mitsubishi mighty max

Please confirm which engine your truck has; 3.0 V6?

Thanks,
Tom
0helpful
1answer

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
0helpful
2answers

Engine not starting turns over good, clean out gas tank and replace fuel filter and blew out the lines and have power to the plugs

Do you have pulse to the fuel injectors? The besy way to test is with a set of NOID lites; these can be rented at many places like AutoZone for little or no cost. Unplug a fuel injector and plug in a noid light; if there is no flash you know you have minimized your search. My gut feel is your trucks ECU (Engine Control Unit) these units from early 90's Mitsubishi have big isses with the capacitors leaking (a matter of when not if). I fully expect you'll need to replace the ECU (the NOID lites will confirm this) when changing the ECU you want to identify it by the MD number on it, this it what you'll need to order a new one. I have had two Montero's and now my son's 3000GT all of whichhad their ECU's fail.
This issue can effect either spark or injector pulse.
Please see attached link for further info:

http://en.allexperts.com/q/Mitsubishi-Repair-824/Galant-spark.htm

I hope this may have helped,
Tom
1helpful
1answer

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
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