Sputter/power loss under load
02-09-2012, 03:54 PM
#1
Sputter/power loss under load
Im having a problem with a sputter/power loss only under WOT, The car has had a 300 code for a while for a random misfire.
It always ran fine so i figured maybe a coil was on the way out but it ran fine,pulled hard and smooth. If it was a random misfire why would it happen every i go WOT ?
The car still pulls pretty hard but feels like it's choking somewhere. I was going to do all the coils but im trying to avoid throwing parts at it if i don't have to. I wonder if it could be S/C belt slip ? Thanks in advance for anyone with any insight.
It always ran fine so i figured maybe a coil was on the way out but it ran fine,pulled hard and smooth. If it was a random misfire why would it happen every i go WOT ?
The car still pulls pretty hard but feels like it's choking somewhere. I was going to do all the coils but im trying to avoid throwing parts at it if i don't have to. I wonder if it could be S/C belt slip ? Thanks in advance for anyone with any insight.
02-09-2012, 08:38 PM
#4
Just a crazy thought, spark blow out. BTW you didn't provide much detail in the problem so for someone to diagnose it over the internet would be difficult. Hopefully someone more experienced can chime in. You should explain it more like when it happens, how, what rpm, how much throttle input, afr etc. Pulling the plug is easy. You should pull them out and see what they look like and maybe post pics. Especially the one from the misfiring cylinder.
02-10-2012, 11:04 AM
#6
I would suggest pulling the plugs you maybe able to tell which cylinder is misfiring by reading them. From there I would either clean and regap or get new plugs. If the misfire is still there and one of the plugs were different I would swap coils with another cylinder and see if the misfire moves, if so replace the coil and enjoy
Btw what is your a/f when the misfire happens
Btw what is your a/f when the misfire happens
02-10-2012, 11:12 AM
#7
I would suggest pulling the plugs you maybe able to tell which cylinder is misfiring by reading them. From there I would either clean and regap or get new plugs. If the misfire is still there and one of the plugs were different I would swap coils with another cylinder and see if the misfire moves, if so replace the coil and enjoy
Btw what is your a/f when the misfire happens
Btw what is your a/f when the misfire happens
Time to get a wideband 02: http://www.ebay.com/itm/AEM-WIDEBAND...item2a0a2fcb28
02-10-2012, 02:46 PM
#8
It drives perfectly fine under normal and even spirited driving, Only seems to sputter at WOT from 3k on up.
Not sure of A/F ratio i don't have a W/B just a NEO to tune A/F's and the sad part is i was supposed to go to the dyno today and get re-tuned and check A/F's while on the rollers.
I pulled all front 3 plugs and they look fine but it won't tell me which cylinder is missing as it's a random misfire code. The 300 has been there for a while and the car never seemed to miss at all until now.
Don't want to spend 550 on plugs, coils and IM gasket if i don't have to.
Not sure of A/F ratio i don't have a W/B just a NEO to tune A/F's and the sad part is i was supposed to go to the dyno today and get re-tuned and check A/F's while on the rollers.
I pulled all front 3 plugs and they look fine but it won't tell me which cylinder is missing as it's a random misfire code. The 300 has been there for a while and the car never seemed to miss at all until now.
Don't want to spend 550 on plugs, coils and IM gasket if i don't have to.
02-10-2012, 05:06 PM
#13
Thanks MaximaSpd85, What do you recommend for a good set of plugs ? It has NGK 2 step colders and i know the car was tuned with those in it, if i ran a 1 step colder would it hurt anything performance wise ? Or is it better to stay with the 2 step's ? Pre gapped or gap them myself ?
02-10-2012, 05:53 PM
#14
if its tuned with 2 step colders then i would stay with those. however, i dont know too many guys that have really had to go with 2 step colder. ive been fine with 1 step colder plugs, and i run a 2.62 pulley. someone with more knowledge can chime in on the performance differences.
you will have to gap them yourself because theyre probably pregapped to something around .044 i would guess. gap them to around .032? maybe .035? somewhere in there
you will have to gap them yourself because theyre probably pregapped to something around .044 i would guess. gap them to around .032? maybe .035? somewhere in there
02-11-2012, 01:53 PM
#15
Cheers.http://forums.maxima.org/supercharge...-step-2-a.html
Last edited by Quickywd01; 02-11-2012 at 02:00 PM.
02-11-2012, 02:04 PM
#16
It drives perfectly fine under normal and even spirited driving, Only seems to sputter at WOT from 3k on up.
Not sure of A/F ratio i don't have a W/B just a NEO to tune A/F's and the sad part is i was supposed to go to the dyno today and get re-tuned and check A/F's while on the rollers.
I pulled all front 3 plugs and they look fine but it won't tell me which cylinder is missing as it's a random misfire code. The 300 has been there for a while and the car never seemed to miss at all until now.
Don't want to spend 550 on plugs, coils and IM gasket if i don't have to.
Not sure of A/F ratio i don't have a W/B just a NEO to tune A/F's and the sad part is i was supposed to go to the dyno today and get re-tuned and check A/F's while on the rollers.
I pulled all front 3 plugs and they look fine but it won't tell me which cylinder is missing as it's a random misfire code. The 300 has been there for a while and the car never seemed to miss at all until now.
Don't want to spend 550 on plugs, coils and IM gasket if i don't have to.
02-11-2012, 06:22 PM
#19
I'd be worried about A/F ratio too because when I put on my V1 w/ 2.87" pulley, with one step colder copper ngk's, fmu, and 255 fuel pump, the engine would cut out at 3k rpm and then blast back into WOT. It'll run lean around that rpm I found out later. I personally think your issue might be a coil pack/ spark plug.
02-15-2012, 09:25 PM
#25
Unfortunatly i do man
Haven't had time to check it out yet because im working like 50 plus hrs a week but it also has a code for lean bank 1 as well. And i REALLY need a wide band asap i know i know.
Since i owned the car it old stars fine idles 1200ish and then when it drops down to 9/1000 it misfires bad until fully warmed up and then it goes away.
It also threw a MAF code bout a month ago because the MAF pigtail was rubbing under hood pad.
I rotated it away and fixed the pigtail and has not thrown the code again so idk.
Last edited by 036mtmax; 02-15-2012 at 09:29 PM.
02-19-2012, 01:50 PM
#28
I pulled the plugs today and there all fine. Im almost thinking it's a boost leak or belt slip because it only misses when im in boost. It won't miss under WOT unless the rpms are over 4k, I noticed the belt loose and i also have a crushed charge pipe that needs replacing. That and because that 300 code has been there since i bought the car and it never missed before.
Last edited by 036mtmax; 02-19-2012 at 01:53 PM.
02-19-2012, 03:31 PM
#29
So you're not going to take our advice and replace/troubleshoot the coilpacks, eh?
Also, 2 step colder plugs are unnecessary and could be the source of your problem as well. 1 step colder is recommended.
Also, 2 step colder plugs are unnecessary and could be the source of your problem as well. 1 step colder is recommended.
02-19-2012, 05:07 PM
#30
Anytime i had a coil **** the bed on any of my Nissan's/Infiniti's it threw an individual cylinder misfire code, Im not saying it couldn't be a coil on the way out but either way the belt has a ton of play in it and i think it has a boost leak as well. Would a slipping belt do that too ? I didn't put the plugs in the previous owner did.
Last edited by 036mtmax; 02-19-2012 at 05:10 PM.
02-19-2012, 05:26 PM
#31
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Anytime i had a coil **** the bed on any of my Nissan's/Infiniti's it threw an individual cylinder misfire code, Im not saying it couldn't be a coil on the way out but either way the belt has a ton of play in it and i think it has a boost leak as well. Would a slipping belt do that too ? I didn't put the plugs in the previous owner did.
I can't remember if you said you checked the coilpacks (I'm exhausted. lol), but I had a coilpack go on the turbo 5.5 gen a little while back and it started as a random misfire. Eventually ended up being coilpack number 2. I would confirm that they are all working and the plugs are ok, and then start chasing down boost leaks and such.
02-20-2012, 02:57 AM
#32
Anytime i had a coil **** the bed on any of my Nissan's/Infiniti's it threw an individual cylinder misfire code, Im not saying it couldn't be a coil on the way out but either way the belt has a ton of play in it and i think it has a boost leak as well. Would a slipping belt do that too ? I didn't put the plugs in the previous owner did.
IMO, the sputtering and the "WRX sound" don't sound like a loose belt problem, they sound like coilpack(s) problems.
Boost leak=leaving power on the table, not sputtering.
Swap coilpacks with a buddy for testing purposes. Then try out 1 step colder plugs.
02-20-2012, 05:25 PM
#34
Nismomaxct: Thanks for reminding me your car is faster lol j/p, The only reason i was thinking about staying with the same plugs is because that's what the car was tuned with and i wasn't sure if changing would effect anything.
Wizard: Im going to change plugs and coils asap and cross my fingers, Ill let you guys know how it turns out. Any ideas where to get deals on coils ? Is there a way to test them if i get used ones ?
Nexus: Thanks for the info man i need to replace that section of charge piping and throw on a new coupler too.
Wizard: Im going to change plugs and coils asap and cross my fingers, Ill let you guys know how it turns out. Any ideas where to get deals on coils ? Is there a way to test them if i get used ones ?
Nexus: Thanks for the info man i need to replace that section of charge piping and throw on a new coupler too.
02-20-2012, 09:25 PM
#35
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Well yours is prettier so I gues I can't have everything. And I jinxed my self. I had a coilpack randomly go on the way home from work. lol. Let us know how your fix work out.
02-20-2012, 10:46 PM
#36
From my experience, testing coils is inconclusive. I've tested good coils and my "on the way out" coils, and the results were the same.
02-21-2012, 04:37 PM
#38
Im going to replace the plugs with NGK iridium's because that's whats in there now and im going to go 1 step colder but the coil situation sucks because everyone i know around here has a 3.5 Max, Might just have to suck it up and buy coils. Every salvage yard i called around here doesn't have any. Might give Aackshun a call tomorrow and see if he can't dig me up a set.
