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Michael Cone Posted on Oct 04, 2017

91 300zx turbo Occassional high idle

I have a 91 300zx turbo. my problem is during cold starts the car idles aroung 1.3 RMPs. After the car warms up the engines automatically drops to 0.5 RPMs or if I depress the gas peddle after it warms up the idlle drops to 0.5 RPMs. Occassionally the idle won't change it stays at 1.3 during the duration of the commute. Does anyone know how to fix this?

5 Related Answers

hiseyj

Jackson Hisey

  • 99 Answers
  • Posted on Nov 29, 2008

SOURCE: 2000 maxima won't stay started on a cold morning

Have the plastic intake manifold and gasket replaced. I have posted this fixed at least once before and have seen it numerous times.

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dj_ricko_198

ricky horwood

  • 128 Answers
  • Posted on Dec 27, 2008

SOURCE: Hesitation or stumble during acceleration

take your car for a tune up
if they are carburetor type motors you may need your carbie cleaned and a tune up
if you clean it your self with carbie cleaner it may increase in idle speed this is nothing to worries about it is a simple adjustment
with a carburetor type motor they tend to idle higher when their cold this is the automatic choke kicking in and normally it should happen till the car is a bit warmer and the accelerator has been depresses
although a car should idle at 800 rpm my paddok car dose when it is cold it idles at 1200rpm i like it this way as the car warms up quicker as i will not drive a car while it is cold
hope this helps
ricko

Anonymous

  • 11 Answers
  • Posted on Mar 09, 2009

SOURCE: have 1987 nissan sentra wagon 1.6 carb.engine the

Check your Ignition timing before anything
check your plugs see what color they are
red or orange means carb is to lean , black
or oil means to rich then you can go from there
and set mixture screws on carb , let me no how you make out .

Bill Hackett

  • 383 Answers
  • Posted on Apr 07, 2009

SOURCE: 2005 Nissan Altima cuts off while driving.

Dear Tajack73: Nissan had a voluntary recall campaign on the 2002,2005,2006 Altima's with the 2.5 litre engines It envolves reprogramming the ECM.
The campaign ID # RD0712 NHTSA #: 07V-527
2005 Altima Vin's 1N4AL11**5C 100003-957025
1N4AL11**5N 400000-934180

The symptom you have described fits the one they have describe in the bulletin. Check with Nissan and see if your car falls within the campaign. Let men know how you do.

Anonymous

  • 140 Answers
  • Posted on Jul 19, 2009

SOURCE: car wont hold an idle and shuts off after u start

Have your idle air control valve and throttle position sensor and mass airflow sensor checked

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I do believe you are correct, but here's how the system works. You turn the switch on, the computer is activated, the temperature sending unit, sensor sends a signal to the computer that it's cold so the computer sends out a signal to the engine to go into cold start mode. The fuel is enriched into the cylinders by raisin the idle just a bit placing more fuel into each cylinder, and the idle is advanced by a little electric plunger at the throttle body. Once the engine has warmed, the water temperature sensor sends a message to the computer to take the engine out of cold start mode and into normal run. Now you can understand why the temperature sending unit/sensor is so vital to proper starting procedure. Replace the temp sending unit/sensor and she will work just fine. School's out. Time to go to work.
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Have you checked for vacuum leaks? Poor idling when cold that gets better when the engine warms up, or at higher RPMs are symptoms of vacuum leaks. Check all hoses and connectors. If it's a manifold gasket, you will want to use a smoke machine (check when the engine is cold).
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91 300zx Turbo idle issue

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All three of my vehicles (2 trucks and 1 car) do the same thing

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89 dodge shadow. hard start. normal idle cold, fast idle warm. sometimes it wont start until i hear fuel pump activate.

Hello,
The car may be hard to start because it may need a normal tune-up. If the spark plugs are pretty used, they will slowly stop burning as much fuel because the spark slowly gets lesser and lesser. On a cold day the fuel is harder to ignite with a small amount of spark.
Normal idle when its cold means that your cars idle is probably too high. If you lower the idle, the choke on a cold day will keep the idle a little higher until the motor warms and then it will kick back off. If the idle is too high, it will run very rich, smothering itself with fuel, and causing the idle to stay low. When the car warms, its creating better spark when its warm, and with the idle being too high its running at a fast idle.
The car wont start sometimes can be the cause of a few things. If the ground is bad on the fuel pump, it wont make a good connection sometimes for when you turn the key on, the fuel pump dont pump the fuel to the engine. Another one can be that your accessory switch can be loose going to the fuel pump. I think its your ground though. Good luck! Hope this helps.
Have a nice day. -Steve
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High idle speed when the engine is cold

The high idle speed at start up is normal. As the engine temperature increases, the engine idle should kick down automatically. Insofar as the emissions results, if there were a problem, the check engine light should be on. If it is, take the car to an autoparts store and have the fault codes read. Most parts stores will perform the scan for free. If the check engine light is not on, and the idle question was all you were worried about, you are good to go! Hope this helped and best wishes.
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Idle out of control.

check all your vacuum hoses and the throttle body itself for a vacuum leaks if the hoses replace as nessasary if to check for throttle body get can of carb cleaner and spray around base of throttle body and sides not in it if idle raises you have a vacuum leak goto a good parts store and ask for a rebuild kit don't goto auto zone or advance they don't carry them
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