ASAP!!! HELP!!! 93 300 zx Dies while driving

[rewolf24]

my 93 300 zx has failed to start/ run for the passed couple weeks. Basically it started dying on me while cruising at 30 to 40 mph. rpm's would slowly cut out regardless of pedal pushing. All lights would come on in dash and i lose power steering and brakes were difficult to push. At first i was able to let it sit for a few minutes and it would start up as if nothing had happened. Just recently it died on me again and i tried to get it to start but it would just crank over as if it wasn't getting any fuel or it would start and try to run but cut out the first few seconds. I checked the fuel line before and after the filter by disconnecting and turning ignition to see if fuel was shooting out of the line and it was. I tried to test the engine to see if it was getting fire through the plugs but i don't have the right spark plug tester that fits into the coil pack and onto the plug. Is there a certain spark plug tester i can buy for this or does engine fire have to be tested another way? Also, could this be a crank angle sensor issue? I saw a video on youtube of a 93 doing something similar to mine. Need help ASAP!! I miss driving my convertible!!!

[DCaff300ZX]

You can pull the spark plug and then put it back into the coil pack, then crank the car over (with fuel pressure released and fuel pump fuse pulled!) and hold the electrode of the spark plug on your intake manifold to make it ground, which should then show if it is firing.
Since you are also going to check your CAS from what you said, a better way is after removing the CAS, put the harness plug back in and with the ignition switch on, rotate the CAS by hand to make the plugs fire as in the example above.

[rewolf24]

where exactly is the cas located?

[ThisIsSparTTa]

Crank Angle Sensor (CAS) is located on the exhaust cam on the drivers side: http://www.z32photoguide.com/sensors.html#sensors

[Z-owned]

I really don't suggest adjusting the cas without a timing light. I would pull codes before anything else as well as checking the ptu for damage/corrosion.

[ChadzTurbo]

My 1993 300ZX /na is dying on me when I come down from 60 or 70 mph to a dead stop. The RPM gauge will flutter between 1000RPM and 0. It will fire back up and run but it does it occasionally. I just replaced the wiring harness and found the top hose on the EGR valve was completely off. My old harness would kill the engine when you pressed the throttle position sensor connections together. It runs good while driving around town at about 30 or 40 mph. Any suggestions or do you think it might be related to this crank angle sensor? I have read on the forum about the ConZult you can run off a laptop and plug it into your car and it will give you the codes and real time info on your car running with the sensors and everything. You can even adjust the timing thru this program. Do you think this will help diagnose my problem? Z1 motorsports sells the kit for about $370.00 Id appreciate any help you can suggest.

I also have an issue since my Z was hit in the front ripping off half my front bumper off. My driver side turn signal works when the headlights are off but when you turn the headlights on, the left turn signal is on solid and it does not blink. I had it working for a minute the other day but when I turned on my fog lights it blew the turn signal bulb. I replaced it today and it only works with the lights off. Any ideas?

[rewolf24]

well i pulled the codes and it comes up code 55 which means no malfunctions of the ones listed in this.
http://www.nicoclub.com/archives/nissan ... ostic.html

Any ideas on what the problem could be?

[rewolf24]

My 1993 300ZX /na is dying on me when I come down from 60 or 70 mph to a dead stop. The RPM gauge will flutter between 1000RPM and 0. It will fire back up and run but it does it occasionally. I just replaced the wiring harness and found the top hose on the EGR valve was completely off. My old harness would kill the engine when you pressed the throttle position sensor connections together. It runs good while driving around town at about 30 or 40 mph. Any suggestions or do you think it might be related to this crank angle sensor? I have read on the forum about the ConZult you can run off a laptop and plug it into your car and it will give you the codes and real time info on your car running with the sensors and everything. You can even adjust the timing thru this program. Do you think this will help diagnose my problem? Z1 motorsports sells the kit for about $370.00 Id appreciate any help you can suggest.

I also have an issue since my Z was hit in the front ripping off half my front bumper off. My driver side turn signal works when the headlights are off but when you turn the headlights on, the left turn signal is on solid and it does not blink. I had it working for a minute the other day but when I turned on my fog lights it blew the turn signal bulb. I replaced it today and it only works with the lights off. Any ideas?

Have you looked up how to pull the codes off the ECU in the floor board?

[ThisIsSparTTa]

My 1993 300ZX /na is dying on me when I come down from 60 or 70 mph to a dead stop....

Trying adjusting your idle the proper way. If you have the idle adjustment screw all the way in, it will do this because the engine can't get enough air to recover. http://z32.wikispaces.com/Idle+Control

[ChadzTurbo]

I adjusted the throttle cables and the idle air screw to match the rpm listed for the 93 300ZX Na and it is still stalling when I go to slow down to go over train tracks or stops. I checked the vaccume on the car at idle and its pulling 18 psi. Does this sound right? We messed with the screw quite a bit yesterday on the idle air controller to see if it would make a difference but no luck. Its still idling at about 750 rpm when warmed up. Any other ideas? I called Z1 motorsports and they were suggesting the idle air controller too. We took it apart and it was clean and the springs were light on the ACC and FICD. Any more suggestions? I had to put it in the shop this morning to get a new front bumper but im looking forward to getting it back running properly as soon as I get it back. Ill pull the codes off the ecu and see what I find.

Thanks,
Chad

[ThisIsSparTTa]

Have you also checked out the TPS? It tells the ECU what position the throttle is in. If the ECU thinks the throttle is open, but its actually closed, that would be a problem. http://z32.wikispaces.com/Throttle+Position+Sensor

Other than that, you don't use PSI for a vacuum units. I'm not sure why the stock gauge is labeled that way. My aftermarket meter reads near 20 in.Hg at idle.

It could very well be your idle air system.

One more, possibly silly question, do you have a dual intake? There were some things they had to do with the old JWT ones to make them idle properly. They don't have to do those tricks any more with the Selin setup.

[ChadzTurbo]

MY BLACK 300ZX NA Runs Again!!!!! Believe this or not.....I took it down to get the front bumper fixed and the driver side turn signal fixed since it was staying on when the headlights where on...well my body man found that the socket the bulb was in had a bad ground inside it and they replaced it with a comparable socket modified to fit the Nissan bulbs and it fixed my turn signal and my stalling issue!! No Joke I guess that socket was grounding out and sending a short back to the ecu killing the car causing the crazy idling when I would hit bumps or come to a stop too quick. She is running like a whip now...well she isn't my turbo but very enjoyable!!!