Question about Cars & Trucks
Check engine light came on with trouble code P0300. Replaced ignition control module, coils, spark plugs. Check engine light came on again with same P0300 code again.
A P0300 code indicates random, multiple misfires were detected. You eliminated the possibility of ignition system faults by replacing the ignition module, the coils, and the spark plugs (unless the replacement part(s) were no good). However you did not mention the ignition wires which are another probable cause. In addition, there could be vacuum leaks due to damaged hoses or improper routing. Consider also fuel contamination or a problem with the fuel system.
Posted on Dec 24, 2013
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Posted on Jan 02, 2017
SOURCE: 1991 honda accord "no spark"
There is a relay mounted way up under the dash on the driver side. It is about 1"x1"x2" and it says Mitsuba on it. This is the PGMFI relay, sometimes called the main relay or fuel injection relay. It is very likely the problem. You can buy another one, or there was a bulletin on how to repair it. You need to take it out, pop the cover off, and resolder the cracked solder joints on the pc board that the relays are mounted on. Really not that hard if you have a little soldering experience. If not, just buy another one, about 50 bucks.
Posted on Mar 26, 2009
1174 is a lean code, and would have to been set first because it will not set when the 0300 is there. 0300 is a random misfire, because it read after the lean code, it was probably caused by the lean condition. 1st check for vacuum leaks from hoses or intake gaskets, you cal listen for a hissing sound, or spray carb cleaner around intake systems, a change in rpm will be noticed when spraying near a vac leak. other probable causes are the upstream 02 sensor, map sensor, or fuel delivery problems. does the vehicle idle porly, or does it miss at the top end?
Posted on Dec 20, 2009
Tips for a great answer:
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