Mitsubishi Repair Problems? Ask a Mechanic for Answers ASAP
When you first turn the key to the on position can you hear the fuel pump buzz for a few seconds?
Have you tried spraying fuel or starter fluid in the intake duct and then try to start it?
That sounds a little strange that the fuel pump doesn't run until it's cranking, but I suppose it could be something specific to this year/model. I've just never heard of that being the case on the eclipse.
The best way to determine if it is a fuel delivery problem is to try spraying some type of fuel in the intake and then try to start it. If it starts and runs for a second or two and then dies, you know the problem is with fuel delivery.
You can use starting fluid, gas in some kind of spray bottle, or even wd-40 will make it run for a few seconds.
Also, do you have a spare key you could try? These cars will disable the spark and injector pulse if the ignition key transmitter chip dies. This is very common. Sometimes a spare key will have a good transmitter and the engine will start. Then all you have to do is replace the dead key that won't work.
You can unhook the air intake duct at one of the two points I circled in blue on this picture and spray a little fuel in then reconnect the hose, then try starting.
Just make sure you don't spray the Mass air flow sensor marked with a red X. It could damage it (not likely, but it could).
I'm leaving the shop for the day in about 10 minutes- I'll check in with you this evening to see if you need more info.
If it didn't start with starting fluid then the problem probably isn't the fuel pump. I would lean toward a bad security key or a bad crank position sensor.
Do you have a scan tool?
If you don't have any communication with your scan tool check fuse #9 to see if it's blown. I can't get a diagram of the fuse box, but if I can remember correctly I think it's in the under hood fuse box.
Let's try that first and see if we can get the communication going. If that fuse is blown, replace it and see if the vehicle will start.
Any luck checking the #9 fuse?
So that means you have spark at least.
I'm still thinking we need to get it communicating to figure out what's really going on.
You can check both of the fuel pump relays for power to the #3 terminal. Then you can see if the #4 terminal on fuel pump #2 is getting power from the PCM.
Mitsubishi shows them to be in the under dash junction box (fuse box).
Can you get someone to crank the engine while you feel top of the fuel pump module to see if you can feel it buzz/hum?
Can you test for voltage at the fuel pump connector? You should get ground on the black wire and 12 volts on the white wire when the key is either in the run position or crank position.
I'm trying to find a diagram of the under hood box. I'm not sure why Mitsubishi is so stingy with their diagrams.
The connector I circled in red should have a white wire with a black stripe. That's your power lead to the fuel pump.
Sorry! Somehow it didn't attach- let me try again.
I would probably replace the fuel pump if you know you are getting power but can't seem to get it to pump. You could pull the fuel line and see if fuel pumps out in the crank position, but be prepared for a pretty strong fuel spray if it is working. You could still be having problems with the injector pulse rather than the fuel pump, so you would probably want to be sure before changing the pump.
There is not a fuel filter on this model. It is just a strainer at the bottom of the fuel pump.
The best way would be if the scan tool will communicate.
We need to be able to check for a cam position sensor signal through the scan tool.
I would probably replace the cam position sensor. It's cheaper than a PCM and the only other part that would affect injector pulse. It's not terribly hard to change. Do you want to go that route next?