Question about 2000 Mitsubishi Galant

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2000 Galant trouble code P0300

My car is wanting to stall. high speed is fine. its just during exeleration or idle.  Trouble code says its a random misfire.  What the heck does that tell me?

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  • Anonymous Mar 20, 2014

    3.5 engine out of no where engine misses stalls sets code po300 restarts and runs fine till next time

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The usual problems with the ISC motor are
a) one of the two coils goes open circuit ie it burns out.
b) the ISC internal gears chew themselves up, likely causing a).

The issue is therefore why the ISC chews up the internal gears. The usual
reason is that there's a build up of carbon and fuel gum in the throttle
body that stresses and jams the ISC gears. This gunk has to be cleaned out.
Further, most of the carbon comes from the PCV valve that vents hot oil
vapour into the intake from the rocker cover. This oil vapour can become
excessive when the valve stem seals are old and not doing their job
adequately any more. Since your car is a 2000, its not unlikely. Piston rIng
blowby is another source.

At a guess, the dealer tech has just replaced the ISC motor without doing an
adequate check (and clean) of the rest of the throttle body to ensure that
the ISC can adjust the speed freely. It may be that the new ISC is faulty,
but its unlikely. An unexpected failure (esspesially if the ISC gears are
again stripped) should result in a more detailed investigation.

Yes, its a warranty issue. Be polite to the dealer.

Posted on Jul 13, 2008

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Just replace plugs/wires also check the cam angle sensor to solve your problem because sometimes an old wire can ground itself and cause a short and misfire your cylinder.......

Posted on Jul 13, 2008

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Hi

Random misfires which do not occur at high revs are usually caused by an intake air leak.

Check all the vacuum lines and intake hosing for splits or insecurity.

A good way of doing this is to start the engine and spray carb spray or the like around the intake hoses etc and listen for a change in engine note, which would indicate a leak.

Very best regards

Geordie

Posted on Jul 13, 2008

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It means that youre either not filling it up properly, or you got a transmission problem, or the pressure in your system is not right..Check for vacuum leaks and transmission issues..

Posted on Jul 13, 2008

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