Question about 1990 Nissan 300ZX
I need a price and what its going to cost or should cost
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
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Posted on Jan 02, 2017
SOURCE: EGR Flow and Knock sensor 1
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
Posted on Jun 14, 2008
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
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
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
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