2010 Mazda 6 67000 Miles Check Engine Light Help Misfire issues
P0300 random misfire
P0421 warmup catylyst efficiency bank 1 below threshold P0301 cylinder misfire |
can someone please advice me the best steps to resolve this problem does my car have individual coil packs or do they come in a pack. Also i was thinking about changing the spark plugs but i am not sure which one to go with i have 2010 mazda 6 V4 and i would lilke some help with the catalyst issue and how to fix it thanks any help would be greatly appreciated
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The spark plugs are due to be changed at 75,000 miles. Change them now. You may also have a bad ign coil. Ign coils from dealer are expensive and are individual.
Now for the Good News :);): The Catalytic converters are warrantied for 96 months (8 years, 80,000 miles i believe) as per: Mazda Factory Warranty | Automotive Warranty | Mazda Canada Provided you kept up your services. If your car is not covered,:mad: look here: https://www.mazdaforum.com/forum/maz...3-0-ltr-30510/ and every other car. The code comes on @ 5% inefficiency and can be cleaned, see post in above thread for more! Do not drive very long while car is misfiring otherwise your cat will be destroyed due to the raw fuel being dumped in the exhaust and igniting in the catalytic causing it to melt:eek:: How can I tell if my catalytic converter is... — Yahoo! Autos AND CLICK HERE: http://reviews.ebay.com/Reasons-for-...00000002803746 Click here to see how to test your cat, not easy: |
i might add:
Make sure there is no oil in the sprk plug wells. Oil would indicate a Valve cover seal leak and the vavle cover seal would need to be replaced along with the ignition parts. The catalytic converter may still be fone but it cant handle all the fuel coming by because of the misfires. In other words the P0420 may clear up. But why not take advantage of the warrenty? Good luck. |
Mazda 626 check engine light and misfires
Had my Mazda 626 for 3 yrs. check engine light started coming on going up hills and it literally crawls up hills. We have brought to several mechanics!! Reads misfires. Changed spark plugs twice, spark plug series twice, coil. Still does it. Cat converter is ok far as I know. One mechanic said due to misfire and other said due to open flap - oil? Very frustrated as no no on seems to be able to pinpoint problem. In PA and need to pass emissions test. This seems to be a common problem. Have already put in over $1500 just in parts tying to troubleshoot and everyone that scans car comes up with different codes. HELP!! It amazes me that no one has been able to actually find the problem and fix it. Next stop Mazda dealer?? Suggestions anyone?
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I had a long reply and accidentally "X"'d it out.
READ and do it: https://www.mazdaforum.com/forum/new...-avatar-30905/ Missfires Can Be Caused By a Million and One Things, Vac Leaks Wiring Issues Spark Plugs(Even Fresh Spark Plugs That Are Crappy Quality.... E3 And Such) Ignition Coils Alternators (Search EMI) MAFS Injectors Injector O-Rings Intake Gaskets TB Gaskets PCV Hoses PCV’s Malfunctioning EGR Malfunctioning CAS O2 Sensors Aftermarket Intakes Intake Hoses Vac Lines Timing Chains Timing Chain Tensioner Broken Cam Gears Malfunctioning Cam Sensors Incorrect Crank Gears(The I4 Has Like 40 Different Configurations For Whatever Reason) Incorrect PCM Flash Issues Within The PCM PCM Wiring Bad Diaphram Within The FPR Issues Within The Fuel Pump Dirty Fuel Filter Dirty Fuel Lines Pre-Cats/Poor Exhaust Flow If the above gaskets/seals have not been changed, change them. Clean your MAF sensor, throttle body. Change your PCV valve and probably that short hose as well. Inspect the intake accordian tube for cracks. Inspect for vaccuum leaks. Put in a good Fuel system cleaner: Red Line Synthetic Oil - Gasoline Fuel Additives - SI-1 Complete Fuel System Cleaner Inspect wires. Re-set ECU after doing above. |
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