SteveSter Posted December 20, 2008 Report Share Posted December 20, 2008 Na, seafoam in the gas isnt enought to burn up carbon buildup in the cylinder since the gas is injected and combusted too quickly to take effect, thats just to clean out the injectors. You have to use it through the PCV the right way and let it sit for a good 30 minutes to an hour. Whats problably happening is the carbon in the cylinder heats up so much that it ignites the fuel prematurely creating 2 flame fronts causing the misfire and possibly a knock if it gets bad enough. Might want to do a vacuum and a compression test also, if piston rings are worn down enough that could also cause a misfire. Quote Link to comment Share on other sites More sharing options...
Task514 Posted December 20, 2008 Report Share Posted December 20, 2008 Whats problably happening is the carbon in the cylinder heats up so much that it ignites the fuel prematurely creating 2 flame fronts causing the misfire and possibly a knock if it gets bad enough. That's why you need 91 octane. Quote Link to comment Share on other sites More sharing options...
SteveSter Posted December 20, 2008 Report Share Posted December 20, 2008 Ehh even 100 octane wont prevent carbon from igniting fuel. Quote Link to comment Share on other sites More sharing options...
///BHRpowered Posted December 21, 2008 Report Share Posted December 21, 2008 Usually if the car is shaking to where you can feel it then it really should be picked up by the ecu, if you've switched/replaced the coils and the plugs then there really isn't much else it can be, I mean the controls and relays, but it wouldn't be the same one all the time Quote Link to comment Share on other sites More sharing options...
SteveSter Posted December 21, 2008 Report Share Posted December 21, 2008 Controls and Relays??? What you talk about willis? That would have anything to do with a misfire like condition. I think seafoam the crap out of it first and we"ll go from there. Quote Link to comment Share on other sites More sharing options...
///BHRpowered Posted December 21, 2008 Report Share Posted December 21, 2008 no, I mean there is only so much that has a part in igniting the fuel. Quote Link to comment Share on other sites More sharing options...
SteveSter Posted December 22, 2008 Report Share Posted December 22, 2008 Hah, there is more going on then you would even dream of to properly ignite the fuel. The fuel:ratio has to be 14.7:1 (depending on atmospheric pressure), spark has to occur at different times BTDC depending on engine load and has to stop 23 degrees ATDC, enough spark has to be produced to ionize the mixture at the right time. So coils and plugs or even carbon buildup may not be the answer. Could be something a bit more tricky especially with no CEL on to help guide you. Could be an injector... Quote Link to comment Share on other sites More sharing options...
Matt64341 Posted December 22, 2008 Report Share Posted December 22, 2008 I read this a long time ago and just found it again, it might help you. http://www.mazdaforum.com/fb.asp?m=45912 Ken inn is also a member at mazdaworld. He says to run a fuel system cleaner and a couple of bottles of heet through the tank. Worst case it doesn't work and your out $4 for both bottles of heet and maybe $8 for techron or other cleaner. Quote Link to comment Share on other sites More sharing options...
latinopikachu Posted December 25, 2008 Report Share Posted December 25, 2008 this is going to greatly anger BHR, but who cares I had a p0421 for the past week, and I decided to run some regular unleaded through to burn crap off the sensor, and wouldn't you know that it turned off and has stayed off? Quote Link to comment Share on other sites More sharing options...
Frankzao Posted January 5, 2009 Author Report Share Posted January 5, 2009 Did you check to see if the code is stored? I cleared mine it it takes a few hundred miles or so to show back up. Regular Unleaded you say? Quote Link to comment Share on other sites More sharing options...
Frankzao Posted April 27, 2010 Author Report Share Posted April 27, 2010 would you believe the P0431 code stayed away till last week. Same scenario. It was raining and the CEL lit up. The Milly S now has 94K....and I cleared it again and it has not returned....to think I almost replaced a bunch of stuff. So keeping my occasional P0431 code in mind and now that I have $$$ to spend...what should I do? O2 sensor, High flow CAT, Exhaust? 20" woofers in the trunk? rear spoiler? tow hitch? hmmm...... Quote Link to comment Share on other sites More sharing options...
Troutman Posted April 29, 2010 Report Share Posted April 29, 2010 I invite Latino Pikachu's commentary. Quote Link to comment Share on other sites More sharing options...
enginph Posted April 29, 2010 Report Share Posted April 29, 2010 High flow cat is OK in CA? Quote Link to comment Share on other sites More sharing options...
Frankzao Posted April 30, 2010 Author Report Share Posted April 30, 2010 I have no idea Quote Link to comment Share on other sites More sharing options...
enginph Posted April 30, 2010 Report Share Posted April 30, 2010 I have no idea I think they dont even sell/ship to CA unless it is OEM. http://www.car-sound.com/ Quote Link to comment Share on other sites More sharing options...
Frankzao Posted May 4, 2010 Author Report Share Posted May 4, 2010 yuck!!!! Quote Link to comment Share on other sites More sharing options...
Frankzao Posted May 15, 2010 Author Report Share Posted May 15, 2010 well the laser plats, oil change, and ChiTown CAI all passed California emissions test..... Quote Link to comment Share on other sites More sharing options...
Troutman Posted May 16, 2010 Report Share Posted May 16, 2010 Quote Link to comment Share on other sites More sharing options...
enginph Posted May 16, 2010 Report Share Posted May 16, 2010 well the laser plats, oil change, and ChiTown CAI all passed California emissions test..... Mileage? I think I will fail in the next emissions, I have two years till then. Quote Link to comment Share on other sites More sharing options...
Frankzao Posted May 17, 2010 Author Report Share Posted May 17, 2010 My Mileage is 95,000..... My results at 15MPh were not good....I feel I too may have a problem in two years.....It did pass but the HC meas 44 PPM at 15mph and only 10 at 25mph....the max is 51 and 35....the CO% was good 0.09 and 0.00 at 15mph and 25mph with max at 0.48 and 0.46.....the NO measured at 255 and 54 with max being 419 and 706 PPM Not sure what it all means except that the hydrocarbons (HC) level at 15 mph is high measuring at 44 when the average is 9ppm and max allowed is 51 ppm....this needs to come down (some how) in the next 2 years. Quote Link to comment Share on other sites More sharing options...
enginph Posted May 17, 2010 Report Share Posted May 17, 2010 My Mileage is 95,000..... My results at 15MPh were not good....I feel I too may have a problem in two years.....It did pass but the HC meas 44 PPM at 15mph and only 10 at 25mph....the max is 51 and 35....the CO% was good 0.09 and 0.00 at 15mph and 25mph with max at 0.48 and 0.46.....the NO measured at 255 and 54 with max being 419 and 706 PPM Not sure what it all means except that the hydrocarbons (HC) level at 15 mph is high measuring at 44 when the average is 9ppm and max allowed is 51 ppm....this needs to come down (some how) in the next 2 years. When I first went CA emissions at around 110k the HC level was half way to the max IIRC. CO and NOx were almost zero. After 2 years at 130k I failed at first and barely passed the next. I found a tear on the flex pipe but I think my problem is burning oil which doesnt sound good in MCE. I may be ruining the s/c and the cat. Are you using synthetic like me? Quote Link to comment Share on other sites More sharing options...
Frankzao Posted May 17, 2010 Author Report Share Posted May 17, 2010 Nope..I am running regular 10w-30w....which flex pipe? the exhaust? Quote Link to comment Share on other sites More sharing options...
enginph Posted May 17, 2010 Report Share Posted May 17, 2010 Nope..I am running regular 10w-30w....which flex pipe? the exhaust? The one between the air box and resonator. Now I have a short ram intake there Quote Link to comment Share on other sites More sharing options...
Frankzao Posted May 18, 2010 Author Report Share Posted May 18, 2010 you must share pix of this....must see....hows it work? Side note: It is raining in the Bay area and i have a random misfire....no CEL, just sputtering....Ideas anyone? Quote Link to comment Share on other sites More sharing options...
DoN_BLaZe34 Posted June 7, 2010 Report Share Posted June 7, 2010 what became of this CEL Frank? Quote Link to comment Share on other sites More sharing options...
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