1994 300ZX electrical problems
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1994 300ZX electrical problems
I've got a 94 300ZX n/a automatic. I'm running into issues with the brake light on the dash flashing on everytime i hit the brakes (note: all lights are all in working order). The stock bose radio only works on one am station plus i'm getting engine noise through the speakers. But the worse part is the damn car is misfiring we've changed spark plugs and injectors still no fix. I have a feeling its an electrical issue b/c everything seems to be going haywire. The check engine light flases on and off also, but i have a OBDII reader and from what i understand this car isnt compatible to that reader. So, I can't read the codes to help trouble shoot the problem. thanx ahead of time for any info that might help me with fixing this issue.
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If a brake light bulb has been replaced and doesnt match the resistance of the stock bulbs exactly then that light on the dash will come on...the lights will still work but but the dash indicator will still come on when the pedal is pressed.
The stock blows (Bose) radio is garbage it could just be shot
For the misfire do a power balance test to find the bad cylinder...unplug one coil pack at a time and listen to the idle drop, when you unplug one and it has no effect on the idle then that is the bad cylinder. Once you find it ohm the injector, should be between 11-13 ohms. If that is ok then check the coil, swap it out with one from another cylinder, if the misfire moves to that cylinder then thats your problem. If the injector is good and so is the coil then check compression
If the misfire comes and goes with the check engine light you could have a corroded connector or bad wire
To check the ECU codes pull up the passenger floor board and get to the ECU, there is a hole in the side with a little dial, turn the dial clockwise for 2 seconds and then back, the check engine light will flash. The first series of long flashes is the first number followed by a series of short flashes which is the second number
Ex....5 long flashes followed by 5 short flashes would be a code 55 which means all clear
For detailed instructions with pictures and ECU codes go here ECU diagnostics
The stock blows (Bose) radio is garbage it could just be shot
For the misfire do a power balance test to find the bad cylinder...unplug one coil pack at a time and listen to the idle drop, when you unplug one and it has no effect on the idle then that is the bad cylinder. Once you find it ohm the injector, should be between 11-13 ohms. If that is ok then check the coil, swap it out with one from another cylinder, if the misfire moves to that cylinder then thats your problem. If the injector is good and so is the coil then check compression
If the misfire comes and goes with the check engine light you could have a corroded connector or bad wire
To check the ECU codes pull up the passenger floor board and get to the ECU, there is a hole in the side with a little dial, turn the dial clockwise for 2 seconds and then back, the check engine light will flash. The first series of long flashes is the first number followed by a series of short flashes which is the second number
Ex....5 long flashes followed by 5 short flashes would be a code 55 which means all clear
For detailed instructions with pictures and ECU codes go here ECU diagnostics
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Originally Posted by Automobile Magazine
The 300ZX Turbo is a dance; it's a song; it's rolling, roaring automotive art. There is no color that doesn't suit it. There is no mood-lifting chemical substance it can't replace.
Last edited by ZXTT; Feb 6, 2010 at 12:57 AM.
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Did you find out what the problem was? I have a 94 vertible 5speed and I'm having the same problem. It killed the alternator so I changed it and that fixed the spuddering but the brake light never stopped. Now the spuddering is back and I think my alternator is going to die again.
