What is the best way in checking the fuel injector for a 1991 3000GT VR4 Mit?

Fuel-injected cars often experience clogs in the oil filter. This is especially a problem for cars that are filled up with low-quality gas and cars that have recently run out of gas. Try adding a fuel injector cleaner and filling up with premium gas for a couple weeks. In addition, check to see if the fuel injectors are functioning properly, and make sure the fuel pressure is within normal range.
For cars with carburetors, check the fuel pump. This is an essential part for fuel delivery, so it is the first thing to check when a car is hesitating during acceleration. It's also possible that the car is hesitating when accelerating because the carburetor is failing.
If the problem persists, have the spark plugs tested to see if there is a malfunction. Also inspect the wiring for frayed edges. Other things to check include the air filter, fuel filter, timing and gas leaks.

Check your fuelfilter could be clogged up good luck hope this helps

It may not be getting fuel. You have to maybe look to changing the inline fuel filter or have the fuel pump itself checked for operation. The fuel pump is in the gas tank, but you can check fuel flow by separating the line at where it goes into the injectors. Put a plastic container under the line where separated and crank the engine a couple times and see if you have fuel flow. Often times the inline fuel filter gets gunked up by sediment from the gas tank and blocks fuel flow.

Check that hour injectors are clean and correctly set. 12,5 l/100km is a very high consumption. Also check that the engine oil is not too full and that the engine breather is not sucking oil/fumes into the inlet sustem.

Best Practices

• Using lower quality gasoline can result in recurring fuel injector problems, even after a fuel injector replacement.
  

• Fuel injector seals should always be replaced along with fuel injectors.
  

Common Symptoms

• Failing fuel injectors can cause engine misfiring and hesitation. The Check Engine Light may come on and set diagnostic trouble code(s).
  

With a friend, crank it over and check for spark. If spark, ok. Crank over for 5 seconds or so then remove a plug or two and check for fuel, if fuel ok. Next it would have to be compression or timing. If no fuel I expect the ECU has failed (typical for late 80's early 90-'s mitsubishi's as capacitors in ECU were poor)
Use a set of NOID lights to check for injector pulse (if injected) No spark could be distributor components or if 3.0 V6 the distributor itself.

I hope this may have assited, please let me know if I may help more,
Tom

what you need to do is add some sulfur additive to the fuel to build the viscosity rateing and also check the glow plug realy itselfs to make sure when it fires that voltage is actaully getting to the glow plugs

seized on main shaft spines.If you can spray DW40 on the splines and leave for a while should.come out shacking and pulling.

It might be just the fuel issue.
Tight the fuel tank cap, change the gas station and use higher octane fuel, use fuel injector cleaner or octane booster.
Good Luck

If this just started, maybe after a hard run, you may want to check your sparkplugs. I've melted the insulator on one of my plugs after a prolonged, spirited run causing same symptoms.