Question about 1990 Nissan 300ZX

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Engine losing power

I have 1990 nissan 300zx that i losing power all around, i just had mass air flow meter replaced and fuel injector replaced. this fixed the problem at first but then it now started having problems again. It feels like the engine is "bogging" down, but all the time. and sucks up gas. idk what the hell is wrong w it. i took it in and the dealer said it has enough power, we don't know what is wrong w it. and ditched me on the situation... pls help!

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Check all the vacuum lines for cracks by bending the lines for dry rot as well as the plug wires check the fuel filter as well to start with as well as any exposed bare wires that may touch ground too ,,,look for the obvious by visually inspecting the motor compartment as well a good starting point also ck all fluid levels ,

Posted on Sep 13, 2009

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Posted on Jan 02, 2017

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03 Nissan Altima showing codes P0304,P0102,P0154,P0113 what are they and how do i repair the problems.


Hi Chris.

p0304 = Number 4 Cylinder Misfire Detected

Faulty spark plug 4
Clogged or faulty fuel injector 4
Faulty ignition coil 4
Fuel injector 4 harness is open or shorted
Fuel injector 4 circuit poor electrical connection
Ignition coil 4 harness is open or shorted
Ignition coil 4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak

The P0304 code means that the cylinder 4 is misfiring or is randomly misfiring. Start by checking for intake leaks an if no leaks are found the next step is to replace the spark plugs on cylinder 4.


p0102 = Mass or Volume Air Flow Circuit Low Input

Faulty mass air flow sensor
Intake air leaks
Dirty mass air flow sensor
Dirty mass air filter
Mass air flow sensor harness is open or shorted
Mass air flow sensor circuit poor electrical connection

Before replacing the mass air flow sensor, try replacing the air filter and cleaning the air flow sensor with low compress air or mass air flow sensor cleaner.
Reset code and drive vehicle.
If the code comes back, it may be necessary to replaced the mass air flow sensor.


p0154 = O2 Sensor Circuit No Activity Detected Sensor 1 Bank 2

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front Heated Oxygen Sensor Bank 2 circuit poor electrical connection
Inappropriate fuel pressure
Faulty fuel injectors
Intake air leaks may be faulty
Exhaust gas leaks

Replacing the Front Heated Oxygen Sensor Bank 2 usually takes care of the problem.


p0113 = Intake Air Temperature Sensor Circuit High

Faulty Intake Air Temperature (IAT) sensor
Dirty air filter
Intake Air Temperature (IAT) sensor harness is open or shorted
Intake Air Temperature (IAT) sensor circuit poor electrical connection

The Intake Air Temperature (IAT) sensor is built into mass air flow sensor or in some vehicles mounted to the air filter duct housing. The sensor detects intake air temperature and transmits a signal to the Engine Control Module (ECM).The temperature sensing unit uses a thermistor which is sensitive to the change in temperature. Electrical resistance of the thermistor decreases in response to the temperature rise. The Intake Air Temperature signal is used as an input for various systems in the vehicle.



Hope this helps
FYT

http://www.autocodes.com/make/nissan

Mar 26, 2017 | Nissan Cars & Trucks

1 Answer

Engen problem and missing


Sir, your question is not very clear, but I will still try to post a solution here. Engine missing could be due to any problem in fuel system, ignition system, engine or ECM as well.

LOW ENGINE IDLE SPEED (Poor idling):
-Throttle body (do the cleaning and idle speed learning)
-A /C signal circuit
-Fuel pump control circuit
-Fuel pump
-Intake system
-P C V valve (clogged or open) and hose

ROUGH IDLING:
-Cylinder Compression
-Ignition system (Igniters, spark plugs, wiring harness)
-Spark plug fouled, gap too wide or too short. (1.00-1.1 mm)
-Fuel injector circuit
-E C M power source circuit
-Fuel pump control circuit
-Fuel pump (required pressure 44 psi - 49 psi)
-Throttle body (cleaning)
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Heated oxygen s ens or
-Mass air flow meter
-Idle hunting
-Throttle body
-Intake system
-P C V valve and hose
-Air fuel ratio sensor
-Mass air flow meter

HESITATION/ POOR ACCELERATION:
-Fuel pump control circuit
-Fuel pump
-Spark plug
-Ignition system
-Fuel injector circuit
-E C M power source circuit
-Mass air flow meter
-Throttle body (do cleaning)
-Intake system
-Valve timing
-Cylinder Compression


Jan 18, 2014 | 2008 Toyota Corolla

1 Answer

My 1990 300zx twin turbo car is running in safe mode due the the fuel temperature sensor? I replaced it and still the odb1 says the same. I reset the car and checked a few other sensors, yet there still is...


vacuum leaks do not show on computer scans-neither do old fashioned tuneups--start checkin hoses and testin for air leaks thruout-also inspec fuel injectors and ignition system

Aug 15, 2010 | 1990 Nissan 300ZX

1 Answer

No take-off speed


if i was you i would first check your maf.thats your mass air flow sensor.make sure that all of your connectors look good .you could also check your tps sensor.that is your throttle position sensor.other than those i would also check your fuel pressure.bad regulator or dampner could do that, i have a 1990 also only mine is twin turbo and had all kinds of probs when i got it so just hang in there and if you have n e q's e me at krunk24@yahoo.com

Dec 07, 2008 | 1993 Nissan 300ZX

6 Answers

1990 nissan 300zx loss of power when accelerating hard at around 4000 rpm after a few seconds power returns


I had this exact same problem and it was the Crank Angle Sensor and Crank Angle Sensor connector shorting out at High RPM.

THe solution was to put some electro-conductive grease on the connector the the sensor.

You'll find the sensor on the driver side near in front of the engine.

Aug 14, 2008 | 1990 Nissan 300ZX

1 Answer

85 nissan 300zx turbo


alternator and mass air flow meter.
see my solution above.....
h

Jul 28, 2008 | 1985 Nissan 300ZX

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