1990 Nissan 300ZX Logo

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Anonymous Posted on May 15, 2017

90 300zx engine problem at operating temperature only. When i push the gas pedal, on gear or not, the rpm drops back to idle after 2000rpm. If i keep pushing the gas, after like 2 - 3 second hesitation, it gives a big kick and accelerates only (means i can't keep the car steady on one speed, because it drops to idle as soon as i let go a little bit of the gas). This doesn't happen when the engine's cold. This seems like a bad sensor or something the ECU does face to a bad sensor signal. Thanks in advance!

  • Anonymous Oct 05, 2011

    no ideas anyone?

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1 Answer

Bill Boyd

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  • Nissan Master 53,816 Answers
  • Posted on May 15, 2017
Bill Boyd
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Have the fault codes read first to determine the problem area

4 Related Answers

seedless916

  • 1 Answer
  • Posted on Dec 03, 2008

SOURCE: 2003 2.5L nissan altima hesitation/check engine light is on

you might want to take the car in to the dealer there was a lot of recalls on that car i know i have one and i just took it in they did a recall on the computer and the catyltic converter the cat shoots pieces of the cat called catalyss into the pistons and blows the motor it only cost a 125 dollars for the dealer to check it and if it is a recall you get that money back!!!

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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

  • 716 Answers
  • Posted on Jan 15, 2009

SOURCE: ok how do you check codes ecu on 300zx 90

People Most Often Take Their Cars To A Local Auto Zone And They Do It Free.
But You Can Buy A Really Over Priced Code Reader If You Want.

Anonymous

  • 1970 Answers
  • Posted on Jul 09, 2010

SOURCE: 2001 Nissan Sentra idling and running issues

mcdevito75 here, I woild bring the car to an auto electrical shop and have them check out the entire electrical system.

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Related Questions:

2helpful
1answer

Rpm does not drop below 1000

No,only on carburated engines it,idles down to the set point,on yours,it's fuel injected,pushing gas pedal won't kick idle down,should go down after a certain amount of time,does it automatically,If you start and drive a 5 mile ride and stop at a stop sign,it should idle at it's set point if there's no engine problems,which may be.5 to .7 on your tac.When you normally first start,it will idle between 1000 to 1200 rpm's,don't push on gas,let idle say 15 seconds,put in drive and go.
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You have a mechanical bind. Disconnect the main linkage and work it all by hand. Everything should be free and slopy. Aerosol carb cleaner will help, but only when the engine is not running.
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High rpm at idle: code P1294 target idle not reached

Hi Rodrigo, The idle control is activated by the temperature sender unit. It sounds as though yours is giving a cold signal to the computer and it pushes up the idle speed to compensate as if it has just started. The sender unit is a different unit from that which operates the gauge on the dash instrument panel. Replace it and I believe your problems will be over.Regards John
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When a car is in gear with the Gas pedal pushed down, the engine RPM is high so the oil pressure is high too that means the Sending unit is detecting high pressure. But when you engage the clutch that means the gas pedal is released so the RPM drops and the pressure drops down too. So all i can say is that you might have a bad oil pump that needs always high RPM to keep the oil pressure normal.

Good luck
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Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.
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RPM is over 400 rpm higher than it should be with no gas pedal.

Could be several things.. I would suggest replace the neutral safety switch, all O2 sensors and fuel and air filters, PVC valve and if needed plugs n wires..
The issue could also be a bad throttle body.. Should be a good idea to get it hooked up to a diagnostic machine - get the codes and then you will know more of what you are dealing with..

Have a great day !!
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