Mechanics

HELP! =[

1990 Nissan 300ZX • 6 cylinder 2WD Manual • 197,000 miles

Enter your question. Car runs rough through 1500-3000 rpm, bucks after the 2nd and 3rd shift.
misfires on one cylinder (5),
sometimes has some backfire,
pulled codes, only has a 13.
which is the coolant sensor, I bought a new one, was a duralast, and no change. Im so confused and frustrated, please help me!
its a 1990 nissan 300zx
thanks so much
Avatar
Chris_davis480
March 27, 2011.



Check the no.5 sparkplug, compression and injector. Could also be caused by the following below

Oxygen sensor.
Catalytic converter.
Fuel injectors dirty/sticking.
Mass airflow sensor/Airflow meter.
Throttle position sensor.
Crankshaft position sensor
Knock sensor
Manifold absolute pressure sensor.
EGR Valve
Fuel pressure regulator leaking or defective fuel pump.
Fuel contamination.
Foul/defective spark plugs.
Open spark plug wires.
Ignition coil/Coil packs defective.
Incorrect ignition timing.
Cap and rotor.

Note: If it doesn't apply disregard it and keep testing.

Rasmataz
Mar 27, 2011.