Fuel Pump / Injector / Coil Pack Issues

[colin.ssc]

Any idea what the difference is between our VTC cover and the revised ones for 370GT?

[Rufus007]

3 hours ago, colin.ssc said:

Apparently hold more oil than the originals

 

Any idea what the difference is between our VTC cover and the revised ones for 370GT?

[colin.ssc]

And apparently that fixes the issue? Or am I being overly optimistic lol

[Rufus007]

3 hours ago, colin.ssc said:

And apparently that fixes the issue? Or am I being overly optimistic lol

Already answered, exactly 11 posts above this one now

[colin.ssc]

Yes you are right. I haven't been reading things properly.

Where did you get the consult 3 from?

[Rufus007]

Got it from ebay.  If you type 'consult 3' into search (without 'nissan') its the first one in the results, seller is chinacardiag.  That was the highest rated seller with the best price.  Actually it arrived today, I just need to pick up a chinese to Oz power adapter this weekend before I can use it now.  Have installed consult 3 on to the WinXP virtual machine and that runs fine so looking forward to getting it all up and running.

[Rufus007]

Relearn is done...  only took a few seconds.    Lets see how it goes over this week

[Rufus007]

VTC relearn didn't fix the problem 100%, but it helped significantly!  Out of the last 7 cold starts, I've had 3 with no stutter, and 4 with minor stutter.  Still using Edge 5w30 which stutters worse then Edge 5w40.  My plan here is to do the VTC relearn when oil temp is approx 60 deg C instead of at full temp like I did last time at around 90 deg C.  Then after a few more thousand kms drop some Edge 0w40 back in and see how that goes.  Might be able to help people around Brisbane out with the consult 3 hardware if needed also.

[colin.ssc]

Yea, let me know how it goes over the next few weeks. If it's good and stays that way I might just pull the trigger and get the consult 3.

[Rufus007]

For now I'm going to say don't bother with the knockoff consult 3... The results are inconsistent so I'm not going to chalk this up as a fix.  It also can't flash software updates and do a lot of what a real consult can do, plus it freezes the consult 3 program often, so can take a few goes to do any maintenance operations.  What it did help was balance the exhaust bank timing:  Bank 2 was always 0.5 less then Bank 1 (I don't know if this is degrees or another measurement), but now is fairly even since the relearn.  Monitored using NDSIII, which by the way has a Exh relearn button that doesn't work for me.

What I did notice just recently was that everytime the engine stutters, the 'Exh/V Timb1 & Exh/V Timb2' in NDSIII spikes by about 20 (degrees?) before settling back to normal.  Not sure how I missed this before, and is still happening since the relearn.  Definitely something going on here, and I'll look at this further.

I've downloaded a shittone of reprogramming files, and I'll take my time looking through which ones could work work if using a real consult 3 computer.  Of course, my testicles would have to grow 10 fold in size before I would feel comfortable flashing any ECU files myself, but still worth checking out.  (wonder if Nissan would rent out a consult 3 machine without leaving the building?)

I think Berni has the best idea for now about changing the engine oil temp with a resistor, even just 10% would probably help.  So much to do sigh

[colin.ssc]

So over the week I've changed my exhaust cam phasing to zero. Stutter and hesitation are now gone. However this would be a temporary fix at best. Not too sure where to go from here. Looks like a VCT issue....ideas, suggestions, thoughts?

 

[Rufus007]

On 11/21/2016 at 10:22 AM, colin.ssc said:

So over the week I've changed my exhaust cam phasing to zero. Stutter and hesitation are now gone. However this would be a temporary fix at best. Not too sure where to go from here. Looks like a VCT issue....ideas, suggestions, thoughts?

 

Good to have a confirmation on what we thought it was anyway.  Obviously will loose power / economy leaving it set at zero.  I still think a small resister to lower the oil temp reading will be the best way to go (given difficulty to get software update).  I'm happy to experiment and find the right resistor, I think about 10% change will do it.  I don't want to remove oil temp sensor in car to throw in a pot of boiling water.  So if anyone wants to donate towards this experiment for a possible solution we could split the $150 for a test oil temp sender.  Got the price from local Nissan dealer.

It will be important to remember that limp mode will come on slightly higher will this mod, but will only affect if racing etc and not normal driving.

[colin.ssc]

I have made contact with a tuner in UK who had posted on the 350z site. They said this "We see a problem on these car mostly at part throttle which is caused by the exhaust cam control issue , basically the PID (closed loop) is to aggressive and causes the cam to move to far causes a stutter it could cause the same issue at cold warm up I presume if it is using the same part of the exhaust cam map.


We basically smooth the exhaust cam control around this area when we tune with the Uprev software sorts the stutter out ever time , no parts need changing."

Which is where I'm at now. In feb I will be looking to do a tune via email with them to see if it works. Issue here is - it'll cost me 150 pounds. Half up front. Half after. I don't know if it'll work which is why I'm hesitating.

[Rufus007]

So do they just edit the full temp map to reduce exh timing at light throttle (maybe low rpm also)?  If so, are you able to do this yourself?  In a similar way you set everything to zero, but just back the numbers off a bit instead?

I spoke with some tuning places in Brisbane, but they all told me the same thing, they don't have the ability to simply raise the oil temp threshold for when exh timing kicks in (which is what the Nissan update does apparently) 

Edited January 5, 2017 by Rufus007
add info

[colin.ssc]

I think they do it so that you still get torque and fuel economy throughout regardless of temp. By zeroing out the exhaust cam phasing, it means 0 regardless of temp or rpms. Losing the ability. 

Thinking back at the other thread on SAU where the guy got techline to update the firmware, I'm gonna take a stab and say that's what they did...change the degree of exhaust cam phasing to not as aggressive as per above which stops the stutter.

I will probably bite the bullet and do it, just need to sort a few things out on the car before letting them tune it. 

Edited January 5, 2017 by colin.ssc

[30ONA]

I skimmed through most of this, so excuse me if I missed it.have you ruled out injectors? Removed and cleaned them. Perhaps a leaky injector, as in dripping instead of spraying.