Does anyone know what is going on with my z?

niznizbobo · 05-08-2012, 07:06 PM

Hello everyone, recently I found there is something wrong with my car I think I need your help.

When I wait for the traffic, the RPM is not stable, it is moving, it should stay around 600 or 700. I don't know. But it seems the car will turn off by itselfs when it is jump down to 500 and jump back to normal. Hard to describe, but yea, I think that is what I want to say. Anyone same happend?

My Mod is G3 intake, Berk HFC, FI cat back. Didn't Uprev it. ( Should I do this to fix the problem)? I am in Australia, no one knows about Uprev... Sad...

Thanks

red6spd · 05-08-2012, 07:28 PM

Did the problem happen out of no where or did it happen after a mod?

niznizbobo · 05-09-2012, 09:58 AM

Quote:

Originally Posted by red6spd

Did the problem happen out of no where or did it happen after a mod?

It is only happens sometimes... Dont know when and how? I am not sure it is only shows up apbefore or after mod... So I really do need peoples help...

Thanks

Nick911sc · 05-09-2012, 10:04 AM

Regardless what your problem is... You're rolling the dice running intake/exhaust/hfc without a tune.

cheshirecat · 05-09-2012, 10:45 AM

I'd bank on an exhaust leak between the headers and HFC causing the O2 sensors to freak out.

OP, any codes thrown?

Lug · 05-09-2012, 11:38 AM

I smell a rat!

Strange engine performance diagnosed and resolved!

Waiz · 05-09-2012, 11:55 AM

Any codes or warnings?

Check your MAF

Quote:

Originally Posted by Nick911sc

Regardless what your problem is... You're rolling the dice running intake/exhaust/hfc without a tune.

Completely false

Jordo! · 05-09-2012, 12:55 PM

Could be ECU overcompensating for an intermittent vacuum leak. Check all intake connections. If all looks good, you can spray some carb cleaner around the hoses while car is running. If the idle changes, you found your leak.

370Z Purist · 05-16-2012, 11:17 AM

Quote:

Originally Posted by Jordo!

Could be ECU overcompensating for an intermittent vacuum leak. Check all intake connections. If all looks good, you can spray some carb cleaner around the hoses while car is running. If the idle changes, you found your leak.

Vacuum leak sounds most likely.

macaddict111 · 05-16-2012, 01:19 PM

I could see vacuum leak too. With VVEL, the throttle valves really only exist to regulate idle and vacuum. If your vacuum kept dropping out the ECU can do a lot with this intake system to get it back up...

advan37 · 05-19-2012, 07:13 PM

Tunning should solve your issue , I had same rpm issue when I added 3g intake and the exhuast, after I did tune no more issues.

toplessdottie · 06-07-2012, 03:19 PM

The easiest/ first thing you could do is check all the connections on your G3 Intake tubing. Whoever installed may not have tightened them up properly. If they are not sealed you will get symptoms like what you are describing, and EVENTUALLY you will thorw a code. (I know form experience).

Hope it's an easy fix

MattP725 · 06-07-2012, 03:47 PM

+1 Vaccuum leak... check the idle air control valve (assuming we have one). That could cause it to flux/stall. We might not have one though since we have an eletronic throttle.

vividracing · 06-07-2012, 04:09 PM

Either an intake leak or vacuum leak. Check all connections on the intake, then check vac lines. It could be an exhaust leak between the 02 sensors as well.

05-08-2012, 07:06 PM	#1 (permalink)
niznizbobo Base Member Join Date: Sep 2009 Location: australia Posts: 41 Drives: 09 nissan 370z Rep Power: 16	Does anyone know what is going on with my z? Hello everyone, recently I found there is something wrong with my car I think I need your help. When I wait for the traffic, the RPM is not stable, it is moving, it should stay around 600 or 700. I don't know. But it seems the car will turn off by itselfs when it is jump down to 500 and jump back to normal. Hard to describe, but yea, I think that is what I want to say. Anyone same happend? My Mod is G3 intake, Berk HFC, FI cat back. Didn't Uprev it. ( Should I do this to fix the problem)? I am in Australia, no one knows about Uprev... Sad... Thanks

05-08-2012, 07:28 PM	#2 (permalink)
red6spd A True Z Fanatic Join Date: Apr 2010 Location: Long Island NY Posts: 3,277 Drives: 2010 Z Coupe M6 SPT Rep Power: 21	Did the problem happen out of no where or did it happen after a mod? __________________ 2010 Base+Sport 6spd: Stillen G3, FI Non-Resonated CBE, FI Non-Resonated Test Pipes, UpRev Tuned, Custom 24R Oil Cooler, JDM Rear Fog-OEM Harness. ???Whp ???WTQ (Will find out come spring time)

05-09-2012, 11:38 AM	#6 (permalink)
Lug A True Z Fanatic Join Date: Dec 2008 Location: Texas Posts: 1,926 Drives: 2006 350Z Rep Power: 20	I smell a rat! Strange engine performance diagnosed and resolved! __________________ keep Chubbs in your pocket - Chubbs

05-09-2012, 12:55 PM	#8 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Could be ECU overcompensating for an intermittent vacuum leak. Check all intake connections. If all looks good, you can spray some carb cleaner around the hoses while car is running. If the idle changes, you found your leak. __________________ Enjoy it. Destroy it.

06-07-2012, 03:19 PM	#12 (permalink)
toplessdottie Base Member Join Date: Oct 2011 Location: Dallas, TX Posts: 143 Drives: An Evil Monkey Rep Power: 14	The easiest/ first thing you could do is check all the connections on your G3 Intake tubing. Whoever installed may not have tightened them up properly. If they are not sealed you will get symptoms like what you are describing, and EVENTUALLY you will thorw a code. (I know form experience). Hope it's an easy fix __________________ Chris '70 Datsun 2000 Roadster '09 370z- Invidia, Stillen G3, ZEnclosure

05-09-2012, 10:04 AM	#4 (permalink)
Nick911sc A True Z Fanatic Join Date: Feb 2009 Location: Long Island, New York Posts: 1,698 Drives: 2010 Nissan GT-R Rep Power: 20	Regardless what your problem is... You're rolling the dice running intake/exhaust/hfc without a tune.

05-09-2012, 10:45 AM	#5 (permalink)
cheshirecat A True Z Fanatic Join Date: Jan 2009 Location: Florida Posts: 1,428 Drives: N54 135i Rep Power: 292	I'd bank on an exhaust leak between the headers and HFC causing the O2 sensors to freak out. OP, any codes thrown?

05-16-2012, 01:19 PM	#10 (permalink)
macaddict111 Base Member Join Date: Apr 2012 Location: Tacoma, WA Posts: 33 Drives: '09 370z White Auto Rep Power: 13	I could see vacuum leak too. With VVEL, the throttle valves really only exist to regulate idle and vacuum. If your vacuum kept dropping out the ECU can do a lot with this intake system to get it back up...

05-19-2012, 07:13 PM	#11 (permalink)
advan37 Base Member Join Date: May 2011 Location: UAE Posts: 63 Drives: 08 G37 Rep Power: 14	Tunning should solve your issue , I had same rpm issue when I added 3g intake and the exhuast, after I did tune no more issues.

06-07-2012, 03:47 PM	#13 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 17	+1 Vaccuum leak... check the idle air control valve (assuming we have one). That could cause it to flux/stall. We might not have one though since we have an eletronic throttle.

06-07-2012, 04:09 PM	#14 (permalink)
vividracing The370Z.com Sponsor Join Date: Jun 2009 Location: Gilbert, AZ Age: 38 Posts: 7,306 Drives: 350Z,370Z,GTR Rep Power: 39	Either an intake leak or vacuum leak. Check all connections on the intake, then check vac lines. It could be an exhaust leak between the 02 sensors as well. __________________ Rocky @ Vivid ♦ 480.966.3040 x236 ♦ Rocky@vividracing.com Email, PM, or call me directly for aggressive The370Z.com member pricing!!!