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Sputtering During Warm-up

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Old 03-28-2011 | 01:14 AM
  #621  
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Originally Posted by FastGreg
What do you think about Midz ?
My car stopped sputtering right after the Haltech EMS. So, its either the stock ECU or the variable cam control since my intake cells is set to zeros in the Haltech.

I lean more to the variable cam control since people noticed a difference with different oil wights.
Old 04-11-2011 | 06:19 PM
  #622  
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mine sputters when warm. Going to a 10w-40w resolved the issue for about 300 miles, then the problem came back. The heavier oil was as a recommendation from Nissan to test. Nissan tech net according to the local dealership diagnosed my problem as bad VTC covers. They wanted $1500 to replace them. I found the covers and service manual page online. Seems easy enough. Except the online manual says that coolant/oil drain is required. I imagine oil drain is required, but is coolant required as well for this swap? Also, anyone know if the used covers have any value? new ones are $448 for each side of the engine... So this is obviously a hell of an expense, some cost recovery would be lovely. Thanks for the help. BTW, just fyi, mine has been doing this since November w/72k miles on the odo at the time.

Last edited by FalGra; 04-11-2011 at 06:21 PM.
Old 04-18-2011 | 11:31 AM
  #623  
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I guess it's not the same issue.

Originally Posted by FalGra
mine sputters when warm. Going to a 10w-40w resolved the issue for about 300 miles, then the problem came back. The heavier oil was as a recommendation from Nissan to test. Nissan tech net according to the local dealership diagnosed my problem as bad VTC covers. They wanted $1500 to replace them. I found the covers and service manual page online. Seems easy enough. Except the online manual says that coolant/oil drain is required. I imagine oil drain is required, but is coolant required as well for this swap? Also, anyone know if the used covers have any value? new ones are $448 for each side of the engine... So this is obviously a hell of an expense, some cost recovery would be lovely. Thanks for the help. BTW, just fyi, mine has been doing this since November w/72k miles on the odo at the time.
Old 04-18-2011 | 11:55 AM
  #624  
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Few update from my side, and oil test results:

- Motul 300V 5W40, oil density:0,893 = Important sputtering
- Motul 300V 5W30, oil density: 0,871 = Light/Medium sputtering
- Mobil 1 New Life 0W40: oil density: 0,850 = Extremly light sputtering, almost none
- Castrol Edge Sport 0W40: oil density: 0,838 = No sputtering at all

I will also test the Motul 8100 X-Max 0W40, design for the 350Z, 370Z and GTR by Motul, with an oil density: 0,842.

Then, I guess the issue come from the density of the oil, which not allow a good work of the solenoid of the VTC, as explain by this garage with the Consult III results: http://translate.google.lu/translate..._20070408.html

So, it seems that the issue come from the oil, but not from the SAE range, the oil density is the issue, more than 0,6 mean "sputtering".

I hope that this short report will help you guys, with the same problem.

And waste less money than me to changed the O2 sensors, MAF sensors, spark plugs, air filters, tune the ECU...

Just try another oil

Originally Posted by FastGreg
New cold start yesterday, no sputtering...

After several starts I will be able to provide you with a consistant feed-back.

I already order some Castrol Edge Sport 0W40 for a last oil trial !

But it seems that the issue really come from the motor oil...
Attached Files
File Type: pdf
300v5w40.pdf (19.5 KB, 121 views)
File Type: pdf
300V_05W30_PowerRacing.pdf (19.7 KB, 151 views)

Last edited by FastGreg; 05-10-2011 at 10:47 AM.
Old 04-19-2011 | 05:34 AM
  #625  
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How do you figure it is not the same issue? Regardless of OIL weight/viscosity effecting the sputter, the problem isn't in the oil...it is the VTC. The oil helps because it is able to compensate for the flaw in the "solenoid." There should not be one type of oil that an engine is required to run on in order to not have a problem. Secondly, if that was the case, would that not be the oil NISSAN recommended or used themselves? I suppose it just makes more sense to me to treat the problem, not the symptom.

Originally Posted by FastGreg
I guess it's not the same issue.
Old 04-22-2011 | 07:47 AM
  #626  
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Originally Posted by FalGra
How do you figure it is not the same issue? Regardless of OIL weight/viscosity effecting the sputter, the problem isn't in the oil...it is the VTC. The oil helps because it is able to compensate for the flaw in the "solenoid." There should not be one type of oil that an engine is required to run on in order to not have a problem. Secondly, if that was the case, would that not be the oil NISSAN recommended or used themselves? I suppose it just makes more sense to me to treat the problem, not the symptom.
Go ahead and let us know
Old 04-22-2011 | 11:06 PM
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hmm well i ran the amsoil 5w-40 and i have had good results from using it. went from all the time on cold starts to every once in a while it will do it. I know i shouldnt do this but some times i just hit the gas just a tad and problem solved lol. i would take it to the stealership but the dealership i go to it rather Gay when it comes to them reproducing problems. what im wondering if gamermodz hast his same problem sense he has a built vq35hr... but probably not it would be nice to know if he would get it.

Also i took my car to uprev(austin) they said they couldnt because i did a long drive up there but it would be nice if someone in the austin area who is having this problem could leave there car at the shop for a couple days so uprev so see what going on the start up.

Also noted my problem started when i changed from royal purple 5w-30 synthetic(if i remember if it was synthetic) to castrol 5w-30(synthetic) then it started the sputter during warm up. and this was 1 week after the retune of my car(also once again at uprev in austin)

im not sure if this info helps but just stating when my started and what ive done to try to address the problem. also i have done the spark plug change at 25k, maf clean and vacuum test for leaks. car currently at 30,500k.

Last edited by hellsoldiers08; 04-22-2011 at 11:07 PM.
Old 04-24-2011 | 06:27 PM
  #628  
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next oil change Mobil1 0w40 . . .
from the Mobil1 website "Density @15.6 ºC, g/ml (ASTM D4052) = 0.85"
sooo . . denser oils are better ? ? ?

wtf ? Mobil1 5w30 also has density of 0.85 . . . but i sputter like crazy with that . . XXCONFUSEDXX

Last edited by srsairbags; 04-24-2011 at 06:33 PM.
Old 04-27-2011 | 07:05 PM
  #629  
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Originally Posted by hellsoldiers08
hmm well i ran the amsoil 5w-40 and i have had good results from using it. went from all the time on cold starts to every once in a while it will do it. I know i shouldnt do this but some times i just hit the gas just a tad and problem solved lol. i would take it to the stealership but the dealership i go to it rather Gay when it comes to them reproducing problems. what im wondering if gamermodz hast his same problem sense he has a built vq35hr... but probably not it would be nice to know if he would get it.

Also i took my car to uprev(austin) they said they couldnt because i did a long drive up there but it would be nice if someone in the austin area who is having this problem could leave there car at the shop for a couple days so uprev so see what going on the start up.

Also noted my problem started when i changed from royal purple 5w-30 synthetic(if i remember if it was synthetic) to castrol 5w-30(synthetic) then it started the sputter during warm up. and this was 1 week after the retune of my car(also once again at uprev in austin)

im not sure if this info helps but just stating when my started and what ive done to try to address the problem. also i have done the spark plug change at 25k, maf clean and vacuum test for leaks. car currently at 30,500k.
I don't have any sputter at 2K RPM's. I have noticed a lot of you use synthetic. I used synthetic in my stock motor but in my built motor I use standard 10W 40

I don't remember having this issue on my stock motor either though.
Old 04-28-2011 | 10:56 AM
  #630  
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Well, these are only conclusions from my own experiments, don't know if it's the truth, or the solution for all of you.
Just want to share my experiences

Originally Posted by srsairbags
next oil change Mobil1 0w40 . . .
from the Mobil1 website "Density @15.6 ºC, g/ml (ASTM D4052) = 0.85"
sooo . . denser oils are better ? ? ?

wtf ? Mobil1 5w30 also has density of 0.85 . . . but i sputter like crazy with that . . XXCONFUSEDXX
Old 04-28-2011 | 04:41 PM
  #631  
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Originally Posted by FastGreg
Well, these are only conclusions from my own experiments, don't know if it's the truth, or the solution for all of you.
Just want to share my experiences
i know, something isnt right mobil1 5w30 and 0w40 cant be the same density . . . cant trust specs of Mobil1
Old 05-09-2011 | 09:44 PM
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hmm so do you think it could be the problem of running synthetic and should only use reg oil?
Old 05-10-2011 | 10:39 AM
  #633  
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Originally Posted by hellsoldiers08
hmm so do you think it could be the problem of running synthetic and should only use reg oil?
IMO the issue don't come from the oil composition (synthetic, mineral, ester or something else...) but from the oil density.

Last edited by FastGreg; 05-10-2011 at 10:48 AM.
Old 05-18-2011 | 08:13 PM
  #634  
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Originally Posted by FalGra
mine sputters when warm. Going to a 10w-40w resolved the issue for about 300 miles, then the problem came back. The heavier oil was as a recommendation from Nissan to test. Nissan tech net according to the local dealership diagnosed my problem as bad VTC covers. They wanted $1500 to replace them. I found the covers and service manual page online. Seems easy enough. Except the online manual says that coolant/oil drain is required. I imagine oil drain is required, but is coolant required as well for this swap? Also, anyone know if the used covers have any value? new ones are $448 for each side of the engine... So this is obviously a hell of an expense, some cost recovery would be lovely. Thanks for the help. BTW, just fyi, mine has been doing this since November w/72k miles on the odo at the time.
ok, so youre saying yours sputters continuously when warm or does the sputter go away after a few minutes ?
Old 06-25-2011 | 05:58 PM
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just put redline 5w30 . . and sputtering is still there . . but it has reduced somewhat . . will look for sputter tomorrow after cold start
Old 07-08-2011 | 08:42 AM
  #636  
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Originally Posted by srsairbags
just put redline 5w30 . . and sputtering is still there . . but it has reduced somewhat . . will look for sputter tomorrow after cold start
Did you checked the density of your new oil ?
Old 07-08-2011 | 12:09 PM
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Originally Posted by FastGreg
Did you checked the density of your new oil ?
nopes . . but Redline didnt help much . . sputtering is the same
Old 08-10-2011 | 05:42 PM
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Unless I missed it, no definite root cause has been defined. If it matters, mine only 'sputters' after sitting in the hot sun (95-100 degree temps) all day in humid weather. I have recently installed a cat back exhaust (ARK Grip V2) and JWT pop charger intakes (HR) and it's been hot ever since the install. My car does not sputter/ studder when started up in the mornings when temps are around 75-80 degrees. Only when it's stupid hot outside. No other engine mods. 07 HR
Old 08-22-2011 | 01:38 PM
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im thinking of getting my towed to nissan so its cold when it gets there and going for a ride with nissan service person to show them exactly what the sputtering is, im still under warranty so my car is covered. I took it there once cause of this issue and they said "we cant find anything" and gave me my car back so hopefully this time they find/fix the problem.
Old 08-22-2011 | 03:59 PM
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Originally Posted by SE5spd
im thinking of getting my towed to nissan so its cold when it gets there and going for a ride with nissan service person to show them exactly what the sputtering is, im still under warranty so my car is covered. I took it there once cause of this issue and they said "we cant find anything" and gave me my car back so hopefully this time they find/fix the problem.
let us know, how it goes


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