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Newbie Forum: Beginner/newbie/general DSM modification questions. First mods, how to run 10's when you haven't run 12's yet, any tech question that doesn't fit in another tech forum. Probationary Members must limit their tech posts to this forum and sub-forums.

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Old 10-08-2010, 10:22 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #1 (permalink)
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1990talondsm's Avatar
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Car cranks but wont start :(


I was driving my car the other day and getting on it. When I let off and started cruising the engine just died. The timing belt didn't break and it is still in time. I am getting no spark and the fuel pump wont turn on but did shoot out fuel with fuel line disconnected and cranking the car. Does anyone know where the fuel relay is cause my Manuel doesn't tell me and how do you tell if your ECU is bad.



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Old 10-08-2010, 11:27 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #2 (permalink)
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Pump does run when the starter is engaging - why you got fuel out while starting and stays on after the motor has started

It doesn't say anything like that in the manual and I'm sure that your ECU took a dump .. like mine did when my car did the exact same thing-suddenly died at an intersection and had to have it towed home.

-good luck . DSM
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Old 10-08-2010, 02:44 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #3 (permalink)
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Do you know how to tell if an ECU is bad or how to test a crank sensor. When cranking the car usually displays some oil pressure cause the motor is turning, same with RPM but it is not showing either.


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Old 10-08-2010, 08:24 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #4 (permalink)
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Quick way to check ECU


If you still have the stock pretend "Boost gauge" hooked up, it should move to zero when you turn the ignition to on. If you remember it working before and now it doesn't move, it's probably the ECU.

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Old 10-08-2010, 09:02 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #5 (permalink)
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Or you could always open it and see if anything looks bad. And the fuel relay is located next to the ecu.

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Old 10-09-2010, 11:40 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #6 (permalink)
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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.


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Old 10-09-2010, 11:47 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #7 (permalink)
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my car did the SAME thing. It was the Crank Position Sensor. it controls spark on these and most mpfi cars. id get one from Mitsubishi, hope this helps..

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Old 10-10-2010, 08:57 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #8 (permalink)
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Quote:
Originally Posted by 1990talondsm View Post
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.
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Old 10-11-2010, 06:09 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #9 (permalink)
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Thanks for the great help wise man. Ill check out your thread.


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Old 10-12-2010, 06:59 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #10 (permalink)
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I went and got a new 20 amp fuse for the MPI next to battery. When I turned the car on everything worked for a second then the fuse blew. Any suggestions where to start looking cause my Manuel doesn't give a good wiring diagram.


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Old 10-12-2010, 07:47 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #11 (permalink)
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Open ECU and look/smell on both sides of the board for burnt black gooey stuff leaking around the capacitors. This is a common problem for 1g ecu's that came with subpar caps.

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Old 10-12-2010, 04:48 PM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #12 (permalink)
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Blown ECU is one thing that could cause you to pop MPI fuses, but so can wiring shorts, bad MAF, bad CAS, or less likely problems with the solenoids, ISC, and injector resistors.
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Old 10-13-2010, 07:30 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #13 (permalink)
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I traced the wires from the MPI and non are split or shorted that I can see. I have a GM MAF so I will have to check the voltage there. I took the ECU out and where one of the capacitors is the is a little brown but nothing crazy. I will try to post some pics of it.


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Old 10-13-2010, 07:34 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #14 (permalink)
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Like stated. Sounds like your ecu is fried.

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Old 10-13-2010, 09:56 AM Show Printable Version Show Printable Version   Email this Post to a Friend Email this Post      #15 (permalink)
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ecu is bad bud.

the caps should be shiny, not discolored at all.

trying rebuilding the ecu and see if that helps.

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