engine rpm drop at idle?

Cell · 06-04-2013, 06:09 PM

While sitting in neutral and when I rev the engine, as the rpm drops it drops below idle and goes back up to normal idle rpm. When it hits it lowest rpm it sounds like the valves are banging on the cylinders. I know others had this problem before but what can I do to fix this? It doesn't happen all the time. I also made a video that I will upload when I get home.

DEpointfive0 · 06-04-2013, 06:11 PM

Sub'd

megalapagas · 06-04-2013, 07:58 PM

Have this problem too, Cell by any chance when that hapoens does your Batterry Gauge seem to drop aswell???

Baer383 · 06-04-2013, 08:04 PM

Is this a stock tune or Uprev?

DIGItonium · 06-04-2013, 10:22 PM

I get this, too, and I can hear the fuel pump motor sag.

Cell · 06-05-2013, 03:55 AM

updated post with video.

Quote:

Originally Posted by megalapagas

Have this problem too, Cell by any chance when that hapoens does your Batterry Gauge seem to drop aswell???

Don't know.

Quote:

Originally Posted by Baer383

Is this a stock tune or Uprev?

stock. does uprev fix it?

logenl7 · 06-05-2013, 07:37 AM

sub'd

jpritche · 06-05-2013, 07:56 AM

My does something similar but when I'm driving and come to a stop, the rpms drop and I can feel the car almost like shudder.

Cell · 06-05-2013, 04:44 PM

Anyone with uprev and tuned have this problem?

DIGItonium · 06-05-2013, 06:26 PM

I've got the UpRev tune, but I don't remember revving it seeing it drop like that since it's something I hardly do. However, if I let my car idle for several minutes or warm up there are times idle drops momentarily.

Baer383 · 06-05-2013, 09:12 PM

Mine has Uprev and my idle is steady + or - 15 rpm

Drex · 06-05-2013, 10:41 PM

wow, never seen my rpm drop that low

SouthArk370Z · 06-05-2013, 11:02 PM

If you're still under warranty, let the dealer worry about it.

I'm no expert but if this was happening to me I'd try a few things that are easy to check and/or fix.
Dirty air filters. Real easy to check and change if needed. Instructions in Owner's Manual.
Dirty MAFs. Easy to check/clean if you have a few common tools. Spray cleaner is available at most auto parts stores.
O2 sensors. Easy to check if you have an OBD/CAN scanner.
Vacuum leaks. Check all the hoses and fitting on the engine.

An OBD/CAN scanner will also allow you to check other engine variables that might be related to the problem. Good investment if you plan on doing any troubleshooting or mods.

Maybe someone who is an expert will chime in soon.

Cell · 06-05-2013, 11:12 PM

Quote:

Originally Posted by SouthArk370Z

If you're still under warranty, let the dealer worry about it.

I'm no expert but if this was happening to me I'd try a few things that are easy to check and/or fix.
Dirty air filters. Real easy to check and change if needed. Instructions in Owner's Manual.
Dirty MAFs. Easy to check/clean if you have a few common tools. Spray cleaner is available at most auto parts stores.
O2 sensors. Easy to check if you have an OBD/CAN scanner.
Vacuum leaks. Check all the hoses and fitting on the engine.

An OBD/CAN scanner will also allow you to check other engine variables that might be related to the problem. Good investment if you plan on doing any troubleshooting or mods.

Maybe someone who is an expert will chime in soon.

Car has 2400 miles on it and the only mod is a catback exhaust. I think it might be the stock tune.

Sent from my Nexus One using Tapatalk 2

megalapagas · 06-06-2013, 01:17 PM

Quote:

Originally Posted by jpritche

My does something similar but when I'm driving and come to a stop, the rpms drop and I can feel the car almost like shudder.

This is what i meant , didnt know how else to put it lol

06-04-2013, 06:09 PM	#1 (permalink)
Cell A True Z Fanatic Join Date: Jan 2010 Location: Chicago Posts: 1,449 Drives: A Garbage Truck Rep Power: 21	engine rpm drop at idle? While sitting in neutral and when I rev the engine, as the rpm drops it drops below idle and goes back up to normal idle rpm. When it hits it lowest rpm it sounds like the valves are banging on the cylinders. I know others had this problem before but what can I do to fix this? It doesn't happen all the time. I also made a video that I will upload when I get home. Last edited by Cell; 06-05-2013 at 03:54 AM.

06-04-2013, 06:11 PM	#2 (permalink)
DEpointfive0 Premium Member Bitches Join Date: Jan 2012 Location: SoCal Posts: 14,824 Drives: a lot Rep Power: 17151	Sub'd __________________ Do YOU want to know what/where I got my username from? ( Click to show/hide ) NSFW due to language:

06-04-2013, 08:04 PM	#4 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	Is this a stock tune or Uprev? __________________ 2013 ZL1 754 rwhp 747 rwtq

06-04-2013, 10:22 PM	#5 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	I get this, too, and I can hear the fuel pump motor sag. __________________

06-05-2013, 07:56 AM	#8 (permalink)
jpritche A True Z Fanatic Join Date: Oct 2010 Location: Cartersville, Ga Age: 32 Posts: 2,570 Drives: '15 RR, '14 IS250 Rep Power: 31	My does something similar but when I'm driving and come to a stop, the rpms drop and I can feel the car almost like shudder. fuct, Initial Z and megalapagas like this.

06-04-2013, 07:58 PM	#3 (permalink)
megalapagas Enthusiast Member Join Date: May 2013 Location: McAllen,TX Posts: 457 Drives: '10 370Z Tour A/T Rep Power: 12	Have this problem too, Cell by any chance when that hapoens does your Batterry Gauge seem to drop aswell???

06-05-2013, 07:37 AM	#7 (permalink)
logenl7 Enthusiast Member Join Date: Sep 2012 Location: Marysville Ohio Age: 38 Posts: 357 Drives: 09 Nissan 370Z 6M Rep Power: 13	sub'd

06-05-2013, 04:44 PM	#9 (permalink)
Cell A True Z Fanatic Join Date: Jan 2010 Location: Chicago Posts: 1,449 Drives: A Garbage Truck Rep Power: 21	Anyone with uprev and tuned have this problem?

06-05-2013, 06:26 PM	#10 (permalink)
DIGItonium A True Z Fanatic Join Date: Jan 2009 Location: Kansas Posts: 3,800 Drives: 09 Z34-TT 6MT Rep Power: 42	I've got the UpRev tune, but I don't remember revving it seeing it drop like that since it's something I hardly do. However, if I let my car idle for several minutes or warm up there are times idle drops momentarily. __________________

06-05-2013, 09:12 PM	#11 (permalink)
Baer383 A True Z Fanatic Join Date: Aug 2010 Location: Lawrenceville,Ga Posts: 4,293 Drives: My foot up your azz Rep Power: 30	Mine has Uprev and my idle is steady + or - 15 rpm __________________ 2013 ZL1 754 rwhp 747 rwtq

06-05-2013, 10:41 PM	#12 (permalink)
Drex Enthusiast Member Join Date: Apr 2011 Location: Maryland Posts: 498 Drives: '11 370z MB 6MT SP Rep Power: 14	wow, never seen my rpm drop that low __________________ 2011 Nissan 370z \| 6MT \| Magnetic Black \| Sport Package

06-05-2013, 11:02 PM	#13 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	If you're still under warranty, let the dealer worry about it. I'm no expert but if this was happening to me I'd try a few things that are easy to check and/or fix. Dirty air filters. Real easy to check and change if needed. Instructions in Owner's Manual. Dirty MAFs. Easy to check/clean if you have a few common tools. Spray cleaner is available at most auto parts stores. O2 sensors. Easy to check if you have an OBD/CAN scanner. Vacuum leaks. Check all the hoses and fitting on the engine. An OBD/CAN scanner will also allow you to check other engine variables that might be related to the problem. Good investment if you plan on doing any troubleshooting or mods. Maybe someone who is an expert will chime in soon. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

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