Originally Posted by 1990talondsm
OK I check the boost gauge and it is not going to zero. I have already replaced the stock fuel relay then. It was just called something else when I got the part from Mitsubishi.
I think your talking about the MPI relay.
When you first turn the ignition on the ECU should turn the CEL on for about five seconds and then turn it off. On the turbo cars it also moves the "boost" gauge pointer to zero and holds it there until you start cranking. While cranking the pointer should move to the vacuum side and if the engine starts remain there while idling, if the car doesn't start it should move back to zero when you stop cranking.
If your ECU doesn't do this it's not running and it time to figure out why, nothing else interesting is going to happen until the ECU is working.
There are a bunch of posts by me on checking the operation of the MPI relay as it applies to powering the ECU. Here's an example. ecu problems
If the relay is functioning then it's time to look at the ECU since the caps fail on all of them and can cause the ECU to fail.