Question about 1990 Nissan 300ZX

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I have a 1990 300zx non turbo automatic if the car starts off in "D" the car starts off in 2 or 3 gear and stays in the gear im doing 80 with a rpm at 5000 but when i start the car off in "1" it takes

I need a price and what its going to cost or should cost

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  • Master
  • 1,511 Answers

The aged engine needs to be replaced. Look for an aftermarket used and reconditioned engine. Have a station lift your out and replace it with a good engine. Could cost $1000 or more.

Posted on Mar 25, 2014

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

MobyMech
  • 106 Answers

SOURCE: EGR Flow and Knock sensor 1

Hi

The EGR valve allows a percentage of exhaust gas back into the engine during part throttle driving conditions. The exhaust gas enters the combustion process and cools the charge down slightly which lowers the emissions.

The EGR flow malfunction is usually rectified by removing the EGR valve and cleaning out the valve itself and the port(s) on the intake where it was sat, which have probably become narrowed due to all the deposits. You need to use a piece of wire to get right into the ports and clean them right out. The valve is connected to both the intake manifold and the exhaust, it is round and will have a vacuum pipe to it. It will either be mounted directly on the intake manifold, or linked to it via a hose, probably metal, and it will be linked to the exhaust via a hose, probably metal.

The knock sensor listens for engine knock, usually caused by incomplete combustion or over advanced ignition timing, and retards the ignition timing to counteract the knock.

You very highly likely have a faulty sensor, but check the wiring first. To suss the problem properly you would need to have alive scan carried out.

Knock sensors are usually located under the intake manifold on these cars and are a complete pain to get to. You'll probably need a universal joint type of affair to get it off. They held on with one bolt.

Very best regards

Geordie

Posted on Jun 14, 2008

pal03246
  • 726 Answers

SOURCE: idle too high +goes higher when put in gear (manual transmision

IAC valve problem. Nissan has a updated harness (with one way diode inside of the harness) to prevent backfeeding for the IAC valve and a new IAC valve also gets installed. That's where I would look. IAC valve or "idle air control" valve.

Posted on Sep 21, 2008

j_del
  • 1586 Answers

SOURCE: 300zx engine idle

The reason it's stalling out is because of the adjustments you made to the CAS and TPS. You need to reset the CAS where it was, since when you rotate this sensor, you change the ignition timing. As for the TPS, that also needs to be reset to how it was. The way to adjust the idle on this engine is with a screw on the idle air control valve (IACV). At the back corner of the engine, on top on the driver's side, the IACV is bolted on. If you crouch down next to the driver's fender and look straight in at the IACV (with a flashlight) you will see a screw recessed in there, with the head pointing toward you. That's the idle adjustment screw. With the engine running, AFTER you have reset the CAS and TPS, turn this screw until you are able to set a warm-engine idle of roughly 750 RPM. Messing with TPS voltage and ignition timing is a sure-fire way to stall or blow up your engine.

Posted on Oct 19, 2008

j_del
  • 1586 Answers

SOURCE: 92 300zx rpm will not go over 2500 rpm pops from intake

This is a classic symptom of a bad mass airflow sensor. Nissan designed this as a protective feature on the car. If the mass air sensor goes bad, the computer limits the car to a 2400RPM rev limit to prevent damage.

The sensor is under the center nose panel between the headlights. Take that off and on the back of the airbox (which fills this space) you'll see a pipe coming out that meets at a "T" with another hose going across and down under the headlights. That pipe off the back of the airbox is the mass air sensor (it has a harness plugged in).

Posted on Mar 27, 2009

csmock132
  • 4669 Answers

SOURCE: automatic transmission wont go to first gear

You have checked the fluid. It's full?

Posted on Aug 16, 2009

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Hi I havw question how many gears have 1991 nissan 300 zx tt automatic and when at chenging gears (rev) I heard around 4000rpm.


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1990 nissan 300zx


I assume this is an automatic transmission. Is it a twin turbo or a non-turbo model? It sounds like you've lost fourth gear and are stuck in 3rd - those RPM would be about right. If you can provide more information, it will probably help in the diagnosis.

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