Question about 1991 Mitsubishi Mighty Max
1991 Mitsubishi Mighty Max 2D 4X4 V6-(FUEL INJECTED) Hi, My truck acts like its starting but it wont start. Its getting gas (i know this because i took off the fuel pump hose off the motor and it is spraying) So the pump is working (but i dont know if its pumping enough) I also put gas in the air filter hose it did pop! Now im going to try replaceing the fuel filter, if that doesent work i will check the injectors. then a fuel pump if needed. I understand that this truck needs fuel pressure so i dont know if its getting enough pressure. Please help! Thanks!
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.
Posted on Apr 25, 2010
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Posted on Jan 02, 2017
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