idle @ 500

johncarlopang · 04-05-2014, 12:55 AM

hi everyone i just notice tonight that my car's idle is on 500 only. everytime i press the gas pedal its like still reving for 2-3 seconds even though im not touching the gas pedal anymore. any thoughts? plus everytime i go on 40mph and up and then go on break slowly, the steering wheel is shaking alittle bit. how will i fix this?

Elan · 04-05-2014, 06:26 PM

Quote:

Originally Posted by johncarlopang

hi everyone i just notice tonight that my car's idle is on 500 only. everytime i press the gas pedal its like still reving for 2-3 seconds even though im not touching the gas pedal anymore. any thoughts? plus everytime i go on 40mph and up and then go on break slowly, the steering wheel is shaking alittle bit. how will i fix this?

So you let off the gas and the revs continue up for a second or two? Sounds normal to me...Engine isn't going to immediately stop revving as soon as you take your foot off the accelerator...

Steering wheel shake while braking at high speeds sounds like warped rotors to me!

DOOMMONKEY777 · 04-05-2014, 07:26 PM

Jordo! · 04-05-2014, 08:12 PM

Search for a vacuum leak. The low idle is quite possibly due to a large positive fuel trim in response to AFR's skewing lean at idle; the revving up would be from it running into unmetered air from a leak in real time, before attempting further correction.

If its a vac leak, it could be anywhere along the intake tract all the way to the primary O2 on headers, but my guess is something under the hood. Check out those little resonator boxes coming off the intake tubes, or possibly even a loose hose clamp.

If nothing obvious is found, spray carb cleaner around the intake -- when the idle revs up you've found your leak.

The vibration while braking is either unbalanced wheels or uneven rotors as somebody else suggested.

Good luck!

johncarlopang · 04-05-2014, 11:50 PM

hey guys. thanks for your suggestion, i dont know how to fix it

Jordo! · 04-06-2014, 07:02 PM

Quote:

Originally Posted by johncarlopang

hey guys. thanks for your suggestion, i dont know how to fix it

Did you find evidence of a vac leak? If so, where?

Fountainhead · 04-06-2014, 08:26 PM

I'm assuming your car's stock? You don't have date of model so hopefully it's not a 2009 with a lot of miles on it, which could lead to seals hardening and vacuum leaks. Hopefully it's something minor. Searching for the vacuum leak as suggested is the first step.

Hauling *** then stopping abruptly and holding the brake pedal down the entire time the rotors are scalding hot can cause buildup on the rotors which can cause the grabby feeling you're having on braking.

johncarlopang · 04-07-2014, 10:56 AM

370z - YouTube

SouthArk370Z · 04-07-2014, 11:10 AM

Quote:

Originally Posted by johncarlopang

370z - YouTube

Throttle response looks normal to me. That's just how modern cars act.

You probably have some buildup/glaze on one (or more) of the rotors(s). Do a couple of 60-5mph hard brakes and it should "burn" the glaze off. If you don't notice a dramatic improvement, you may have warped rotors - but that is not very common.
As per Fountainhead, don't hold your foot on the brake after a hard and/or long stop as this can cause buildup/glazing. Try to keep rolling until the pads/rotors cool down a bit (not always possible to do safely).

gbrettin · 04-07-2014, 11:20 AM

If your rotors are warped you can also take them to a machine shop to have them turned on a lathe.

johncarlopang · 04-07-2014, 11:39 AM

Is my idle normal? During morning like 6am idle runs at 1k and after i get hone from work . It shows between o-1 rpm

Chuck33079 · 04-07-2014, 11:46 AM

That sounds normal. When it's cold, it idles higher and settles down when the engine is warm. That's just how things work.

johncarlopang · 04-07-2014, 12:43 PM

what full synth oil do you use on your Z?

Chuck33079 · 04-07-2014, 12:44 PM

Quote:

Originally Posted by johncarlopang

what full synth oil do you use on your Z?

Any full synthetic of the appropriate weight will do you just fine.

gbrettin · 04-07-2014, 01:18 PM

Quote:

Originally Posted by johncarlopang

what full synth oil do you use on your Z?

Becareful what you ask around here

Moble1 Full Synthetic is pretty popular here. I've been running Royal Purple.

04-05-2014, 12:55 AM	#1 (permalink)
johncarlopang Base Member Join Date: Apr 2013 Location: las vegas Posts: 141 Drives: none Rep Power: 12	idle @ 500 hi everyone i just notice tonight that my car's idle is on 500 only. everytime i press the gas pedal its like still reving for 2-3 seconds even though im not touching the gas pedal anymore. any thoughts? plus everytime i go on 40mph and up and then go on break slowly, the steering wheel is shaking alittle bit. how will i fix this?

04-05-2014, 07:26 PM	#3 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Oct 2010 Location: Crooklyn Posts: 1,008 Drives: 370Z 6psd-sport-pkg Rep Power: 21	__________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

04-05-2014, 08:12 PM	#4 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Search for a vacuum leak. The low idle is quite possibly due to a large positive fuel trim in response to AFR's skewing lean at idle; the revving up would be from it running into unmetered air from a leak in real time, before attempting further correction. If its a vac leak, it could be anywhere along the intake tract all the way to the primary O2 on headers, but my guess is something under the hood. Check out those little resonator boxes coming off the intake tubes, or possibly even a loose hose clamp. If nothing obvious is found, spray carb cleaner around the intake -- when the idle revs up you've found your leak. The vibration while braking is either unbalanced wheels or uneven rotors as somebody else suggested. Good luck! __________________ Enjoy it. Destroy it.

04-07-2014, 11:20 AM	#10 (permalink)
gbrettin A True Z Fanatic Join Date: Oct 2010 Location: Portage, MI Posts: 2,284 Drives: Tricycle Rep Power: 589151	If your rotors are warped you can also take them to a machine shop to have them turned on a lathe. johncarlopang likes this.

04-07-2014, 11:46 AM	#12 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29539	That sounds normal. When it's cold, it idles higher and settles down when the engine is warm. That's just how things work. johncarlopang likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

04-05-2014, 11:50 PM	#5 (permalink)
johncarlopang Base Member Join Date: Apr 2013 Location: las vegas Posts: 141 Drives: none Rep Power: 12	hey guys. thanks for your suggestion, i dont know how to fix it

04-06-2014, 08:26 PM	#7 (permalink)
Fountainhead Track Member Join Date: Feb 2013 Location: FL Posts: 834 Drives: 2019 Civic Type R Rep Power: 14	I'm assuming your car's stock? You don't have date of model so hopefully it's not a 2009 with a lot of miles on it, which could lead to seals hardening and vacuum leaks. Hopefully it's something minor. Searching for the vacuum leak as suggested is the first step. Hauling *** then stopping abruptly and holding the brake pedal down the entire time the rotors are scalding hot can cause buildup on the rotors which can cause the grabby feeling you're having on braking.

04-07-2014, 10:56 AM	#8 (permalink)
johncarlopang Base Member Join Date: Apr 2013 Location: las vegas Posts: 141 Drives: none Rep Power: 12	370z - YouTube

04-07-2014, 11:39 AM	#11 (permalink)
johncarlopang Base Member Join Date: Apr 2013 Location: las vegas Posts: 141 Drives: none Rep Power: 12	Is my idle normal? During morning like 6am idle runs at 1k and after i get hone from work . It shows between o-1 rpm

04-07-2014, 12:43 PM	#13 (permalink)
johncarlopang Base Member Join Date: Apr 2013 Location: las vegas Posts: 141 Drives: none Rep Power: 12	what full synth oil do you use on your Z?

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