![]() ![]() Here’s a quick and easy test to determine what is causing your 3’s fourth cylinder to misfire. ![]() If you have multiple codes with P0304, jump down a section. EGR valve is good, engine compression is good plug wires are good - the only thing we found was the new plugs put in were double diode, not NGK like Mazda recommends - we are going to change them out this weekend and see if that helps. If P0304 is the only code you get when you plug an OBD II scanner into your 3, this section should help you determine what is causing the code. It started losing MPG so I had it tuned up - ever since I have the same shuddering, engine light, wanting to stall, no power - code P0300 shows, which is a General Engine Misfire - could be anything. I have a 2002 Protege that I bought in June 2008 with 84500 miles. The car only has problems when at a complete stop or crawl speed (like moving up a car length in an intersection). Since then, I have had a rough idle that I simply cannot get rid of. The real fix would be anywhere from 300-1000 and that would be a new catalytic converter i beleive (not a. My father and I recently replaced the head gasket on my 2002 Mazda Protege DX (2.0L Engine). EGR valve is good, engine compression is good plug wires are good - the only thing we found was the new plugs put in were double diode, not NGK like Mazda recommends - we are going to change them out this weekend and see if that helps. Getting rid of check engine light for code P0421. It started losing MPG so I had it tuned up - ever since I have the same shuddering, engine light, wanting to stall, no power - code P0300 shows, which is a General Engine Misfire - could be anything. SOURCE: obd2 code p0300 on mazda protege 2002 Just had one of these with a maxima, the code is multiple random misfire, when a misfire occurs, to start is do the basics, replace the plugs, check fuel pressure, clean throttle body, and coolant is topped up. ![]()
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