1992 mitsubishi precis and the fuel injectors will not work!

Hi Clyde:
Since you mention "gas rail" I'm assuming fuel injected.
I'd check the fuel pressure in the rail. Should be around 40 PSI.
If pressure is OK then injectors not working. Time to check cps.
You know the spark side is OK since it will run.

You would put on a new crank sensor because the ignition system won't work, it gives no spark. So now do you have spark at a spark plug wire end? A blue consistent spark? Probably good ignition system, as long as all spark plugs get a spark.

One thing you always want to check with no start is the fuel pressure. Turning the key to on should turn the fuel pump on and put pressure in the fuel rail at the engine. Autozone and maybe others rent or loan fuel pressure gauges. Multi-port injection systems have high pressure specifications, around 40 psi normally. That is what the injectors require to spray out fuel when they pulse and open the nozzles.

With the injector circuit, the first thing to check is if each injector has power to it with the key in ON. One power wire and one ground wire goes to each injector. The power wire is from a fuse that is powered with key on or key in start, and then it is spliced to all of the injectors. The injector grounds all run into the engine computer, where the circuit can be internally grounded for a split second and cause the injector to pulse. But anytime the key is on, the injectors have steady voltage available to them.

Check all fuses first, then with an assistant, check for spark with a spark tester. if there is spark at 2 plugs, check for fuel pressure at the fuel rail with a gauge. Engines need three things to run, fuel, spark, and compression. If there is spark and fuel, do a compression test, if the timing belt jumped/broke, you won't have any

sounds like a bad ignition module if your pressure reads out good, if you have spark and no start it most likely is this since it takes the signal from the distributor and sends it to the injectors and the spark coil get a reading on that pressure first though

have you replaced the fuel filter? Where did you test the fuel pressure at (was it after the filter or before?)
Also - I'm just curious -- how old is the fuel?

If the 8th letter of the VIN # is W which i bet it is than your fuel pressure is to low.

This engine uses a CPI unit to deliver fuel to the cylinders. The CPI unit consists of a central injector that feeds fuel to the poppet valve that are right above the intake valves. The poppet valves require high fuel pressure in order to open and deliver fuel to the cylinders at start up.

The reason why it starts and runs if you add a little gas through the throttle body is that once the vehicle is running the intake is under vacuum. The poppets can open with less fuel pressure in a vacuum. This is a real common scenario with these style injection systems.

A new good quality fuel pump (a/c delco or delphi are good pumps) and your fuel pressure should be back into spec of 58 psi or more and the vehicle should fire right up. Make sure you replace the fuel filter when you replace the pump.

I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

There is a injector spider under the intake,this,or the fuel pressure regulator could be the problem,so you might just check this out.

I have been told on some cars that the cam sensor provides the pulses for the fuel injection. Hope it works for Ya!!

have you checked the fuel pump?

spark and fuel pressure at the times while it not starting? I hope so.
Will it start if you spray carb cleaner in the intake? If so we are dealing with an Injector issue Several injectors could be failing when hot It's very common also you need to hae a NOID light to verify that the injectors are being PULSED by the ECM if you have NOID and spark and fuel pressure then the only thing to do is while its stone cold. OHM all the fuel injectors and record all the reading for each cylinder.
Drive it then once it will not start, quickly do the ohms test again and record all readings again and any readings that are lower are likely bad injector windings and you need new injectors.
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