Question about 2004 Mitsubishi Endeavor
When i started the car stubled @ 30-40 MPH. Pulled the codes and found: P0431 Cat eff on bank 2 P0421 Cat eff on bank 1 P0302 Misfire on Cyl #2 Tracked the misfire down and replaced the Direct ignition Coil on 2 and. code no longer pops up. However There is still the stumble @ 30-40 MPH and now i have a pending P0300 Random misfire code.
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Posted on Jan 02, 2017
SOURCE: 2000 Galant trouble code P0300
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
P0300 is for random miss-fire, loose or defective gas-cap, water in the fuel, damaged vacuum line, clogged fuel and/or air filter, faulty plugs and/or wires, fuel injectors. These are more common reasons, there are others but this a good start.
Posted on May 15, 2009
code 304 is number 4 cyl,check the plug insulator for white(arch) markings-if you see any markings replace the insulator
Posted on Aug 31, 2009
determine when it misfires, and isolate cylinders. a poormans method is use an infrared temperature gun (one with high range, 700 degrees or more is preferable) and with engine held at rev(say 2500) point at each exhaust port 1 by 1, misfiring holes have colder exhaust than firing holes.
If the misfire is momentary or intermittant, or caused by defective cam or crank sensors, you should see professional help...those problems require more advanced equipment to get the 1st time, unless you dont mind lobbing expensive parts randomly till you get lucky
Posted on Sep 12, 2009
SOURCE: Service Engine Soon
you need to change all the o2 sensors reset the computer it might come back on a couple of times just keep resetting it you could buy one of the cheap code scanners for 49 or 59 dollars and reset yourself if you go to a shop they are going to sell you a catalytic converter for a few hundred bucks and the code will come back. let me guess you got about 100,000 miles on it what it really means is a shop or dealer will get paid for a cat job when you dont need one
Posted on Aug 03, 2010
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