It gave me a cylinder 2 misfire before changing the coilpacks now this. Checking the battery tomorrow to see if it may be the problem.

 

if it was the battery im sure the car wouldn't start. If you read higher up u can see i kept getting a cylinder one misfire. I no longer have any misfires. Check all probable reasons mentioned by other Helpful people who gave me advice above. Mine was solved with the new Coil i replaced. Just so u know the coils I had were brand new. Not even A week old. I had the problem before getting the ignition system. Kept getting cyl 1 misfires. So Got new ignition system. Same problem. Took it to the shop. Was told it could be Fuel pump and got my Cat removed till i found the problem. Got brand new Fuel Pump, it Did nothing, still got misfires and smoke still continuously came out exaust. Took it back. They found out it was A faulty coil. Got new coils and Now the problem solved. No misfires and no more smoke. Im catless for now. Hope u figure out what it is.

 

Good stuff

 

please help getting code p0300 and p0302 I replace spark plug 3 weeks. appointment with Mazda dealership tomorrow morning. video

 

Have you gone through the list posted on the first page? Did you only change the spark plugs? Or did you do coils as well? All 4?

Go through the list and check off what may or may not be the culprit of your issues.

 

I have an 04 that I've been restoring and one of the first things I did was get new plugs, wires and coils. Before this I got the flashing CEL and after I replaced this.... I got the flashing CEL. Now a couple things to note. No loss of power that I could feel. Anyway I thought the odds of new parts being bad was low but I wanted to do the easy stuff first and make sure. So my original plan was to pull the coils mark them front to back A, B, C, D and install them in reverse order. Well... I'm glad I didn't do that because my problem really was a new coil and going D, C, B, A would have changed my problem from the second rotor (front of the car to back) with the trailing plug to the 1st rotor leading plug.

Anyway I saw someone on youtube show three different ways to test coils and one was just to remove them and ohm them all out and see if one of them wasn't the same as the other three DING DING! We have a winner. Or in this a looser. I just finished paying for a bunch of work on the work truck so I'm pretty broke I think I'll just get one from O' Reilly to replace the odd one out (And pray the other three aren't duds) I hate new parts that don't work. I checked and they have "MasterPro" or "Import." The import looks like the **** ones I bought. The MasterPro ignition going is a light color so it ought to stick out like a sore thumb.

Anyhow I got the oil lines in (With the right number of washers) My repair job on the Oil Pan looks nice and it appears to be tight. I thought once the new coils, plugs, wires go in maybe for ONCE no more flashing CEL.... Oh, and looking at an article on replacement of plugs I note that there is ANOTHER missing part... The rubber splash guard that you need to remove to get at the spark plugs. Well more parts to find or maybe I've got some sheets of rubber someplace to fashion something while I figure out what the part number is.

Anyhow for what its worth another thing to ponder if you have misfires. Are my brand new parts broken?

 

My misfire is a little different. I knew flashing Cel light indicated misfire but I hooked up my diagnostic tool and I was giving codes for random misfire ,bad crank shaft positioning sensor, "cat" something bank 1 and cylinder 2 misfire. I replaced coils plugs and wires and the CEL light went off but did just light before and would flash at high Rpms. Now the only codes it shows is cylinder 2 misfire and the "cat" bank 1. So my question is what would cause 1 cylinder to misfire and which one is cylinder 2? Thought rotary engines don't have cylinders?

 

Generic term for the housings.
If You're getting P0420 code, your cat is likely bad and that can cause misfires.
Inspect it, if It's bad, gut it or replace.
Misfires kill cats, bad cats kill engines.

 

​​​​​​​that will throw a code for a misfire just on one cylinder?

 

​​​​​​​so bad cat will throw a code for only one cylinder misfiring?

 

Misfires kill most cats, not all ...

 

So a bad cat will show a misfire on one cylinder and not just a complete misfire code?

 

I don't know for sure, I don't remember the code, but I got the flashing CEL with all new ignition components and a clogged cat 5 years ago.
Installed a midpipe and no more misfires.

 

​​​​​​​thank u for your help

 

I noticed on my 04 that the PO had installed an O2 sensor at the cat that had a different connector then what the car needed. So it looks like they cut the connector off the old O2 and sliced it into the new O2 that's in the car now. I too am getting a misfire at high RPM's although I never get a code for the O2 sensor though being faulty. Could this cause a misfire??
Its beyond me why they wouldn't just buy the correct O2 in the first place...

Thanks,

 

HI GUYS....so here is my situation:

a month ago I was driving at highway speed of 75mph and then my car decides to give me a CEL and losses power to were i can only maintain 50mph. This had happened to me before but what i did was replaced all the ignition system. So the coils, Sparkplugs, and the wires. It fixed it then but it could not be the same issue because it had only been a few weeks since i changed them. So what i have done is cleaned the eccentric shaft and replaced the MAF sensor. No luck and I did this when the car was running like in the video, know it only cranks over. Right now my car only has a little bit less than a quarter of fuel. What I want to do next is check my barometric sensor and my fuel pressure. Am I on the right track? Any suggestions? The mazda dealership is two hours away and its hard to get it towed and with college and a baby coming its hard to pay something like that!! Help please!!!!!

my specs on my car are
2006 Spec I with 115,000
All stock except for de-CAT
i try to maintain by premixing and keeping current on oil changes.

Any suggestions or help would be great!!!

 

You need to get an OBD scan to find out what's causing the misfire.

 

Yeah my codes were p300 p302 and C1093. Then like I said after
I completely changed all sparkplugs again, and had the MAF sensor replaced but to no prevail.

 

Yeah, check the fuel pressure.

I would also read the front O2 readings if possible.

 

Hey so today I was going to check the o2 sensor and fuel pressure but since I had replaced the spark plugs I wanted to check them and see what they would look like and they looked like in the picture. Rotor 2 so the one closest to the driver had the plugs like new l!! And the front rotor had them black?! Could it possibly mean that my coils are failing or should I still try the fuel pump?

 

This is all a guess but the fuel pump would (?) effect everything the same. Right?

I think blackened plugs indicate a too rich fuel to air mix. Having one rotor different from the other? Maybe something to do with the injectors? *I'm guessing. I had all the plugs look black from stuck selenoid(s) screwing up vaccum lines to turn things on and off. The error was Misfires and the CEL flashed but it was just gagging with too much fuel when I let up on the gas. All it needed was two new selenoids and it runs great now. No more #$(*#&$#ing flashing CEL.

 

The other day I was at a red light and my rx8 was missing real bad and then it died. It started back up but it kept revving up and down between 600-2000 rpm and when i tried to go up in rpms it kept missing and would pull back and re catch itself while accelerating. I got home and took apart the intake only to find oil everywhere inside the filter and the throttle body. I just had the motor rebuilt less than 6000 miles ago. when i would get up t high rpms it would just blow clouds of smoke and misfire. What does this mean? I have pictures of the oil in the intake and throttle body.

 

Hi everyone, plz help on this, I have this mazda rx8 and Iv come across a problem while on high speed. The engine doesn' respond, rpm drops fast, misfires, exhaust out let is white which is so abnormal, when I'm starting....I struggle raving it and the rpm doesn't go more than 4000rpm , engine sound is completely changed and no pulling.

Below is what iv checked and all seems to be fine

plugs
leads
coils
fuel pump
aircleaner
Midpipe CAT

I need more suggestions on the following process plz advise.

thanks

 

Sounds like your fuel filter is plugged - high speed will use gas fast and the flow drops off, misfires and stalls.

 

I checked on the filter that is inside the tank and seems to be fine. Is they any other filter that I should check?