only firing on 3 cylinders?

[pauld90]

im only running on 3 cylinders. the driver side is the only side getting fire. i check the coil packs and there all good. i have been looked about the ptu and how to test it. i was hoping one of u guys might of had the same problem and could tell me what u did to fix it. the ptu is the original from 1990. please help

[ThisIsSparTTa]

http://tech.aus300zx.com/pturepair/Image8.jpg if you have the PTU on the left, take it to a nissan dealer for a recall replacement.
If you have the new one, then I'd test it.
I'd also check your injectors, you are likely to have old style, which are prone to fail: http://z32.wikispaces.com/Fuel+Injector

[pauld90]

thanks will do

[nissanfreak12]

If you are only getting one side to fire, might need to check your timing belt, may have slipped. CHeck to make sure the injectors are actually clicking, you can always do this by taking out the CAS spinning it slowly with the key to the on position and either a stethoscope or long screwdriver. This will tell you you are at least getting fuel. Spark is just taking the coil pack out and seeing if it sparks.

[ThisIsSparTTa]

Need to ohm to make sure injector is working. It can click but not be dispensing fuel.

[nissanfreak12]

Need to ohm to make sure injector is working. It can click but not be dispensing fuel.

Yes, this is very true.

[Hackysac300zx]

I had this same problem…I did everything…replaced coils/plugs/injectors/ptu/maf/injector and coil wiring/and timing. and what it came down to was my ecu burned out on cylinders 1,3,5(passenger side). check your ECU and change accordingly.