RPM dips below 600 after reving

justin_boy · 01-21-2019, 10:54 PM

Hey Guys, so when warmed up our cars idle at about 600. Today I noticed that when I rev'd it in the garage , it would dip below to about 400 and then go back up to 600 again
car is 2019 nismo with 1800 miles, is this normal?

JARblue · 01-22-2019, 12:45 AM

New enough that it shouldn't be dirty throttle bodies or MAFs... do you ever see this dip at idle or does it only happen when you rev first? I'd be inclined to think it's not unusual to dip after a rev at rest but others with much more knowledge than I may have something else to say. My 2011 with 100K miles typically idles around 700 RPMs with clean intakes.

justin_boy · 01-22-2019, 01:43 AM

Quote:

Originally Posted by JARblue

New enough that it shouldn't be dirty throttle bodies or MAFs... do you ever see this dip at idle or does it only happen when you rev first? I'd be inclined to think it's not unusual to dip after a rev at rest but others with much more knowledge than I may have something else to say. My 2011 with 100K miles typically idles around 700 RPMs with clean intakes.

only when i rev and it comes back down it dips to about 450 ish and comes back up again

fryzia23 · 01-22-2019, 07:10 AM

Sounds like you have a vacuum leak. Any mods? Intake?

Spooler · 01-22-2019, 11:13 AM

Quote:

Originally Posted by justin_boy

only when i rev and it comes back down it dips to about 450 ish and comes back up again

Sounds normal if it is cold and the car is cold. This can happen if it has just come off of fast idle to normal idle. I wouldn't be too concerned about it.

justin_boy · 01-22-2019, 02:46 PM

Quote:

Originally Posted by fryzia23

Sounds like you have a vacuum leak. Any mods? Intake?

no internal mods

only tomei cat back

vq37818 · 01-23-2019, 02:40 AM

It's normal. I find that it happens more when the oil temps are higher. Don't worry about it and enjoy

justin_boy · 01-23-2019, 10:39 AM

Quote:

Originally Posted by vq37818

It's normal. I find that it happens more when the oil temps are higher. Don't worry about it and enjoy

hell yeah brother

01-21-2019, 10:54 PM	#1 (permalink)
justin_boy Track Member Join Date: May 2015 Location: woodland hills Posts: 600 Drives: z34 Rep Power: 8367	RPM dips below 600 after reving Hey Guys, so when warmed up our cars idle at about 600. Today I noticed that when I rev'd it in the garage , it would dip below to about 400 and then go back up to 600 again car is 2019 nismo with 1800 miles, is this normal?

01-22-2019, 12:45 AM	#2 (permalink)
JARblue A True Z Fanatic Join Date: Mar 2011 Location: Austin, TX Age: 43 Posts: 36,450 Drives: 11 Z34, 98 E36 M3 Rep Power: 2684440	New enough that it shouldn't be dirty throttle bodies or MAFs... do you ever see this dip at idle or does it only happen when you rev first? I'd be inclined to think it's not unusual to dip after a rev at rest but others with much more knowledge than I may have something else to say. My 2011 with 100K miles typically idles around 700 RPMs with clean intakes. __________________ 2011 370Z 6MT Sport Gun Metallic \| ARC \| CJM \| Ecutek \| FI \| Fujimura \| R2C \| SPL \| Stillen \| TWM \| Z1 \| ZSpeed \|

01-23-2019, 02:40 AM	#7 (permalink)
vq37818 Base Member Join Date: Aug 2016 Location: Glendale Posts: 97 Drives: 19' 370z 6MT Rep Power: 9	It's normal. I find that it happens more when the oil temps are higher. Don't worry about it and enjoy __________________ 2019 370z Sport 6MT \| Magnetic Black

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01-22-2019, 07:10 AM	#4 (permalink)
fryzia23 Enthusiast Member Join Date: Dec 2010 Location: new jersey Posts: 452 Drives: 2011 MB 370Z NISMO Rep Power: 1246	Sounds like you have a vacuum leak. Any mods? Intake?