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Car keeps shutting off/fuel problem
07-02-2011, 04:39 PM
Post: #1
Car keeps shutting off/fuel problem
2000 mitsu. galant, 4cL, 3.1L not sure bout tranny. Indianapolis, Indiana.


It first started last week, it was jerking around and missing like it would do if it was running out of gas but i have half a tank i just put in. then yesterday i drove to the west side and sat for like a half hour, car was probly still kind of hot, and it just would not stay running long enough for me to even put it in drive. just kept shutting off over and over, even if i revved it to hell its like the gas just isnt circulating. So we checked all the fuses by removing them all which were all good, but then the car was running again. We thought maybe the fuses had just been reset but I am thinking now that the car had just cooled off and was in working order again. So I got half way home and it died on me, then kept dying over and over and i couldnt get more than a few inches. So i left it, got a ride home, and this morning was able to drive it again to auto zone where they did a diagnostic and came up with the camshaft position sensor (poor electrical connection or short circuit)and also a random cylinder misfire (faulty ignition/fuel system faulty/vacuum leak). Everyone thinks its the fuel pump, but none of these people are mechanics.
This is the first real problem ive had out of this car since I got it 2 months ago. The only minor problem has been a loose battery cable. Also I just got an oil change 4 days ago.
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07-02-2011, 08:43 PM
Post: #2
RE: Car keeps shutting off/fuel problem
Do you have the Code NUMBERS from the diagnostic scan? Those descriptions don’t really tell me a lot. Code P0300; Random Misfire, could indicate a fuel problem or electrical. Camshaft Position Sensor points toward electrical. This is all guessing though without the code numbers.

If a fuse blows it won’t start working again after cooling. Other electrical items might like the ignition coil, module, or fuel pump.

Something fairly inexpensive to try would be a gas filter. It could completely cure the problem or “help” it. If it helps I would then suspect the fuel pump.

Please get us some code NUMBERS and we might be able to provide better information.

Thanks for using the forum,
Garner

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07-02-2011, 09:28 PM (This post was last modified: 07-02-2011 09:30 PM by MissBB.)
Post: #3
RE: Car keeps shutting off/fuel problem
The codes I received are P0300 and P0340
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07-02-2011, 11:45 PM
Post: #4
Car keeps shutting off/fuel problem
I would be leaning more towards an electrical issue. Look at the wires and connectors for the camshaft position sensor. Look for bare, melted, or broken wires. Check any connectors. Check that they are plugged together properly. Unplug them and make sure that they are clean & free of rust or corrosion.

Other things to consider would be Plugs, Wires, Cap, & Rotor. If you haven't done a tune up in a while, now might be the time. I have included a couple of links to very short articles with good information.

P0300

P0340

Please let us know what you find.

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Garner

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07-03-2011, 06:34 PM
Post: #5
RE: Car keeps shutting off/fuel problem
I'd have to agree with Garner but my gut feeling is leaning toward a fuel pump, especially if you are over 100,000 miles. It's one of the few things that will sometimes "get better" after waiting a half hour, although an ignition coil can do that at times.

If you feel brave enough to take a few spins around the block till it acts up try smacking the bottom of the fuel tank with a large rubber hammer when the problem happens. If it seems better then it's the fuel pump.

BTW, if you change the pump then also change the fuel filter. You'd be amazed at how much crap a failing pump will throw into the system.
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07-03-2011, 07:53 PM
Post: #6
RE: Car keeps shutting off/fuel problem
Well I have been driving back and forth to work the past few days which is only a few blocks (should be walking lol) to see if anything happens. Is there a test for the fuel pump I can do that can show me if the fuel pump is actually pumping the gas?
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07-03-2011, 09:08 PM
Post: #7
RE: Car keeps shutting off/fuel problem
Whenever I suspect the fuel system I hook a gauge to the fuel line, route it out to where I can tape it to the windshield, then drive the vehicle until it dies. At that point I can simply look at the gauge and tell if the pump is working. I would think that any garage in the area could do the same for you. That would be a good way confirm or eliminate the fuel pump.

Please let us know what you find.

Thanks for using the forum,
Garner

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