so i've experienced the infamous misfire... i replaced one coil and it seemed to go away for a bit then it came back, so i replaced all coils, but for some reason I still feel a misfire. i also changed the spark plug in the misfiring cylinder, what else could be causing the misfire?

 

Low octane fuel. Did you reset the ECU?

 

... that sounds like something with the spark plugs then maybe. You already replaced the coils, i would replace all of the plugs now too. then if you still have the problem, and havent already replaced your MAF do so. And by misfiring do you mean sluggishness, or do you feel your car shakin...?

 

by misfiring i mean shaking... and a p0305 code

 

try cleaning your MAF sensor. Use electric parts cleaner.

 

i reset the ECU and it seemed to go away for a little while, but its back, of course. so im going to change all of the spark plugs again and clean the maf.

 

get the MAF......

 

Just curious why replace all of your spark plugs again if you already did so?

Since you said you replaced all coils and plugs, check also the condition and loosness of the engine ground harness(ECC) and get your injectors cleaned.

Do you get your SES or SLIP, TCS lights ON again when the car is shaking?

-Reprogramming your ECU will not solve this snag.

-The MAF could be a possibility but I don't think it's the culprit.

 

If you're using platinum ngk plugs changing them again can be expensive and shouldn't be necessary. If you really want to go back in there I would just pull and look at them. If you have a haynes manual it can tell you what it means when a plug looks like yours does. I would just pull the one on the misfired cylinder. Make sure it's gapped correctly too. If that doesn't work, you've tried everything else so you may want to have a dealer diagnose it. I don't know how expensive that'll be but If you're changing everything multiple times that too is expensive. You also may not want to clean your MAF. I don't know, people fall on either side of that debate. I'm concerned that I'll mess it up trying to clean it. Maybe that's just me.

 

Someone I know had the same problem (ejik80 on .org) but he had a different code. The ECU was recet every time, spark plugs changed, coils changed, MAF changed, but the damn misfiring (shaking) kept coming back again after a few days. What he did to solve the problem is got rid of his Max for 05 Accord V6 MT w/leather and XM....

 

where is this engine ground harness/ecc?

sadly, i am thinking about just getting another car.

 

You're gonna get another car cause of this problem? Hmm, obviously you should know there's no perfect car from anomalies and expect maybe other worse ones to arise from your next purchase.

I also had this intermittent multiple misfire and since I've only changed my plugs(original) and coils, the engine is running great. No ECU reprogram or MAF replacement/cleaned.

The ECC runs around the engine block and there's 2 attachment bolts on the front left hand side of the engine when looking forward under the hood.

I'd suggest to pay a competent/experienced independent mechanic or your local dealership to troubleshoot your problem and let them know exactly what you've done. Then go from there. Good luck.

 

well look. In some instances, the problem can be cured, in some just can't (read my prev. post). Independent mechanics, the "good mechanics" dont know **** about electrical, the Nissan dealer charges by the hour, not a flat fee. It may take them countless hours to find the problem. There's cost and benefit.

 

True. I would agree with you on that. Just wondering if he's looked at all possibilities. He can explain his situation at the dealer and ask them how long it will take to diagnose and for sure they may say well we don't know how long. 1hr? 2hrs? 50US/hr?. Maye they will find something.

 

the dealer said that they charge hourly and can not really tell you how long it will take to diagnose the problem. It could be that they will tell him to replace the coils again when he had them replaced, just to collect their $$$ all over again, this is like a closed loop.

 

so cylinder misfire will set off an SES light? or do you just have to know it's misfiring?

 

i undertand your frurstration. it happened to me as well. i was getting hesitation, and crappy gas mileage. i replaced the coils, maf and plugs. and after spending all that muaa, it drove like new for a month and then started misfiring. i put on the old plugs and it went away. then i took it to nissan and pointed the problem. they fixed it and i don't have the prob anymore. i forget what they said was the problem. i will dig up the paperwork, if i find it i will let you know

 

thanks for all of the input. as for getting a new car, its obvious that i love my max, but there is a certain point to which the limits of repair would be. since the plugs and coils are new, and the nissan techs i talked to said that it should solve the problem 99% of the time, i wouldnt spend hundreds of dollars for them to search for a problem and then not find one or to find out its a major problem that will cost even more to fix. hopefully this is something that just solves itself or can be fixed easily, and i will be bringing it to a mechanic when i do have time. sadly it doesnt speak very well for the nissan community as many people have experieneced similar problems, hopefully under warrenty for them, even though it is a relatively cheap fix, compared to the a/t's of acura, it still is something that could have been prevented. thanks again for the input and replies