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Old 08-06-2012, 05:40 PM
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300zx wont start

Have a 1990 300zx that was running great .Shut off wont start back. Changed the Power Transister-still just spins...... any ideas?
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Old 08-06-2012, 07:43 PM
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Power transistor? for what?
Ignition? Injector resistor?
Maybe you could provide more info?
Do you have spark? fuel pressure? Injector pulse?
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Old 08-06-2012, 07:47 PM
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Timing belt.
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Old 08-07-2012, 04:39 PM
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Quote:
Originally Posted by LATECH View Post
Power transistor? for what?
Ignition? Injector resistor?
Maybe you could provide more info?
Do you have spark? fuel pressure? Injector pulse?
Picky picky picky lol
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Old 08-07-2012, 06:52 PM
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Chet.....
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Old 08-09-2012, 07:52 AM
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Power transistor? for what?
Ignition? Injector resistor?
Maybe you could provide more info?
Do you have spark? fuel pressure? Injector pulse?
Fuel Pump comes on- No spark at the coil packs . The power transistor tells the coils when to fire. That was a common problem on these cars. Replaced that , and still no spark... Cam shaft Sensor is next in the circuit. Would that cause the same symptoms?
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Old 08-09-2012, 03:19 PM
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I put $5 on crank angle sensor bad

EDIT: talked to a Nissan guy here at work and he says they don't normally go bad, but they can. He said more than likely it has come loose. Just tighten it. Supposedly easy to get to to tighten. You are lucky.
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Old 08-09-2012, 03:24 PM
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Okay… Will try that next
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Old 08-09-2012, 03:28 PM
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It isnt loose… just checked
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Old 08-09-2012, 04:23 PM
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Did you check for Ig + 12 volts at each coil? The power transistor (module) fires the coils, most likely from the ground side. If there is no Battery voltage ( 12 v + ) at each coil, you wont have spark.
Also You could check the signal from the PCM with a logic probe to determine that the PCM is sending its pulse to the Ig module (or power transistor)
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Old 08-10-2012, 06:35 AM
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Havent checked the voltage at the coil… would u do that before replacing the cam shaft position sensor?
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Old 08-11-2012, 06:26 AM
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I would do abunch of checking before spending money on parts.
I would ch eck for 12 v + supply to coil and injectors. Also check reference voltage to sensors.
It would be helpful to extract trouble codes also. You can use an OBD 1 scanner to do so. There should also be a method to get flash codes out of it, you know , count the engine light flashes when the ECM is put into output mode. I just dont remember offhand what to do to the system to get the ECM to test output the codes.But I would certainly do it.
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Old 08-11-2012, 07:34 AM
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Okay, so far: All the fuses have been checked, and all the relays that could be found.. We did find a relay for the fuel pump, believe that it was bad, so we changed it and the fuel injectors are working.. Not getting a fire tough, have tried everything that we know how to do. Got a cam shaft position sensor off a junk 1991 Nissan ZX and that wasn't the problem...
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Old 08-11-2012, 08:10 AM
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Going to have to check for trouble codes. You may need to get out an oscilliscope and do some testing also. Outputs for the ignition coils before the Ignition control module will need checked. You should be able to check that with a logic probe. You may be able to check input signals with a DMM. Camshaft and crankshaft signals to be exact. Like I said before, you also need to check for a 5 volt reference signal, also some vehicles use a seperate circuit from the PCM for cam and crank sensors, it may be 5 volts or more. A technical manual would help there.
It could be a defective PCM.
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Old 08-11-2012, 07:42 PM
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Car is FIXED!!! Well It will atleast crank up and run Change out the computer.. Thank you guys for all the help! Now to swap transmissions.. Hope to be able to drive it soon! That is one fun car!!! Thanks again for all the help!
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