20 Most Recent 1991 Nissan 300ZX - Page 2 Questions & Answers

Have you checked the tranny fluid?

The throttle position sensor may be causing your issue----This sensor monitors the outside air temp.In the winter the throttle opens up far because th.e air temp is cold and vice versus

open the valve cover and feel all your lifters to see which is loose.

spin your push rod with your fingers while tightening your rocker arm(should be 5/8) once you can not spin the push rod any more give it 3/4 of a turn and your good to go repeat for any loose rocker arms.

take a known good wire and install on cylinder 5.if it fires replace the wire and do same on cylinder 6.if this has no effect replace the cap and rotor.If the cap is broken check the motor mounts for too much movement. Ask when you are going to buy the new cap.Have you pulled the diagnostic codes? They sometimes tell where to look.Success!!!

Here's a link to where your fuse box is.

got a lot of miles on it???? might need syncros

Click here to see.

You have 2 problems: the mounting bracket behind the dashboard has broken loose, thus it "flipped" over. Secondly, the speedometer cable is probably kinked or broken and needs to be replaced...

When you turn the key to on, not start, the pump should come on for about two seconds and then shut off. It won't come back on until the car is being cranked. Then it should be on, and remain on when the car is running. If the car won't start, and you suspect a fuel or fuel pump problem, the best way to check it is have the fuel pressure tested. Correct pressure at the injectors is critical for the engine to get enough gas to run proper.If you don't want the pressure test, and only want to verify pump is working, then break into the fuel line somewhere convenient and see if gas spurts out when you are cranking the engine over. If it does, pump is working. If no gas comes out, line is plugged or pump is not working. To test for power to the pump, a mechanic would check for power at the fuel pump connector while the engine was being cranked.

when a tranny has this sort of problem the modular unit or actuator piston is registering the tailshaft/ engine speed ratio at the point when a shift is required. Have a auto shop check the pressures in the tranny as it may be a mechanical adjustment problem or if electrical it may be the wires in the oil or the unit itself

I've seen cracked flywheels on chevys make that kind of noise

have a 1993 300ZX N/A and have had two injectors go out on me at different times. This is an expensive fix for two reasons; 1) the injector. 2) the installation process.If you're lucky you can find a shop or eBay seller with new or reconditioned injectors at an affordable price. $150~$275/injector is steep. Worse is the cost of removal and installation since the upper plenum and fuel rails must be removed. This is a design flaw by Nissan since you can see both screws to remove the injectors, but one is partially covered by the aliminum upper plenum (big silver colored aluminum air intake over the block). There are some sites that will talk about drilling or filing the plenum to allow access to the second screw, but this is highly frowned upon and you run the risk of putting a hole in the plenum. Best to leave this as-is.It's cost effective to replace these yourself if you're handy with a wrench and a screwdriver. the cost for a shop to do this job is between for one injector. Most of the cost is the labor to remove and replace the plenum and fuel rails.If you want to do this yourself, start with using a voltmeter and check each injector to find the bad one. Set the voltmeter to Ohms, disconnect the electrical from the injectors, and check the resistance between the contacts of each injector. They should read between 10 and 18 Ohms. Here's how:http://www.2carpros.com/how_to/how_to_check_fuel_injector.htmHere's a step by step process for replacement:http://wiki.answers.com/Q/How_do_you_install_fuel_injectors_in_Nissan_300_ZXLike I said, I paid for this twice and never again. Too much money for such a small part that I can do myself in my spare time.

does system have fluid if it does then need to bleed system

duplicate question

Sort of.There should be a relay that provides power to the pump when you first turn the key on.Then once the engine starts power is provided by way of the oil pressure switch. That way the pump won't run in an accident.The oil pressure switch grounds the fuel pump relay on some models.