so i just got a new motor put in my 2004 Rx8. when i drive at steady or high rpms the engine light blinks and has a code that reads misfire cylinder two, could this be from having crappy gas in it or something more? cause the car runs fine and isn't blowing smoke or anything noticeably bad.

also i see a lot of opinions on what oil to use. and was wonder if i should go with 10W20 or 5W30, and is there a brand i should go with? i would like to use either mobile one, or royal purple, what do you's think? I'm from ct so it gets very cold in winter. and also very hot in summer, cause i heard that the weather effects what oil to use. so any help/opinions would be appreciated.

~~~~~PROBLEM SOLVED~~~~~

 

misfire usually means coils, plugs, n wires.

not sure if they reuse those when replacing the engine.

 

check coils plugs and wires ... in the worst case, a misfire can cost you a motor

I used Castrol Gtx .... 10w30 in summer .... 5 w 20 in winter and I change every 2k to 3k miles

 

ok i have 10W20 gtx semi synthetic in it now so good to hear im not doing everything wrong. and wih the misfire..i already lost one engine. so ill get wires for it tomarrow and see what happens. but will seafoam help get rid of the **** in the gas tank? or at least help burn it off?

 

I read in here recently that a particular synthetic oil ,not to use ,is Mobil 1.As best as I can remember.But dont quote me.

 

**** in the gas tank? How do you mean? Seafoam is primarily used as a de-carbon method

 

well the car sat for about 4-5 months. and i didnt kno if that would make the gas in it go bad or stail. so i thought that seafoam would help burn it off like it does with the carbon build up.

 

Had the same problem with mine when I had my new engine installed. Reset the eccentric shaft position sensor.

 

not to sound like a noob...but where would this censor be located?

 

Not sure exactly but the location isn't important. (I believe it is located right near the main crank) There is a procedure to reset the sensor. I believe you turn the key to the on position and pump the breaks quickly 20 times until the check engine light blinks. Anyways its something like that. Do a little research and you will find the procedure. Its been a while since I've done it myself.

 

thanks man i found that procedure. but the light now comes on and off randomly.. lol so im gonna try changing the coils and wires see what happens. but that did get it to go off for a little while

 

Clean the Ecc. Sensor, might help.

 

i cant find the damn thing. lmao any pics or something to help me locate it? but thanks for all your's help so far

 

Mobil 1 is a great oil. Though go read the oil threads for general info on synthetics.

From underneath the car, it's right in front of the oil pan next to the e-shaft pulley (the bigger one).

You can also do it from the top if you take off your intake (or if you have the MS/AEM CAI there's enough room to get to it.). It's between the e-shaft pulley and the A/C compressor pulley all the way at the bottom. I find it's easier from underneath the car though.

 

I had a bad sensor, and it only caused problems when starting. It also threw up an ecc. sensor error code, rather than a mis-fire code. I understand that your problem could be the sensor, but I think its far more likely to be (as already mentioned) bad coils, plugs, or leads.

 

also another few questions.. does the numbers on the coils matter? cause mine went 1-3-2-4 or something close, and i replaced them with others from my other motor but in no order...would this cause a problem if the numbers arent in order or in a certain pattern? and does the check engine light have to b reset to go off? or when the problem is fixed it will go off itself?..

 

here is the sensor




image taken from here https://www.rx8club.com/showthread.p...ht=DIY+seafoam

 

as for your coils ... make sure you have the correct signal going to the correct spark plug ... otherwise you could be rebuilding pretty soon ... I do not think that the Coils physically differ from each other though ... what is the exact CEL you are getting?

 

solid engine light and blinks randomly. also thank you for that picture it helped tonss..but the coils will have to go 1-2-3-4 then? cause when i got it they werent in order of 1234 cause i had two 3's..im so confused lmao

 

You are confusing me ... what numbers are you talking about?

Blinking CEL means misfire ... ur engine is in danger ... what is the code you are getting?

 

The following link should help you out.

https://www.rx8club.com/series-i-trouble-shooting-95/coil-pack-order-138419/

 

i dont know the code. the kid just hooked it up to a computer and said it was saying misfire on cylinder two. and on the top or the spark plug coils they have numbers 1-2-3-4... i dont know if they have to go in order or not

 

What matters is that each coil pack is feeding the correct spark plug.

Check that the wires run exactly like this:

 

that's exactly howthey are...i reset the Eccentric shaft censor today and diconnected the battery along with the 21x brake pedal reset and its been fine. so i think you guys have helped my dilemma!! i will let you know if it goes back on tomarrow or if other problems occur, but THANK YOU ALL for your understanding and willingness to help, it is much appreciated and very helpful!!

 

bad news ppl =[ lol i drove it today to see if the light would come on and the light is blinking at random rpm's again but not staying lit like last time. so i dont know what it could be and im getting very frustrated with the car. any other opinions on what it could be? cars still runs/starts and idles fine