Question about 1991 Nissan 300ZX

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Engine isn't firing

I was having problems with my car loosing rpm's when pulling away from a stop. The car would drop from an idle at approx 900 rpm's to approx 400 rpm's and would almost stall. This didn't happen all the time, but would happen ferquently. I bought the car to an advance auto parts to have them check the alternator, battery, etc... They diagnosed that a new battery was needed. So, I purchased a battery from a local retailer, and installed it into my 300z. When i went to start the vehicle it would crank over, but the engine wouln't fire/start. So, I removed the new battery and installed my old battery. However, I ended up with the same response from the 300z... the engine turned over fine, but wouldn't fire/start. What would cause the vehicle to not fire/start? fuel pump? fuel filter? fuel injector? relay? Any help is greatly appreciated.

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When you put the car in "on" position, do you see you check engine light on? If not, you may have a malfunctioning ECM. Check under the pass. seat for the ECM. When you pull the seat, on the side of the ECM you'll see 2 lights. One green on and a red one. Make sure both lights are on. This will tell you if the ECM is getting power. If it isn't, under the pass side carpet is a metal cover that protects the wiring harness to the ECM. Cut away wrap and look for any breaks in the BLACK wires. These are your grounds. The factory splices like to come apart. If you do have power to ECM, Check ignition module, crank, or cam sensors.

Posted on Jun 20, 2008


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The tachometer shows 900 RPM on idle position but as i put the car in gear and release the clutch the RPM drops and u have to race the car manually through accelerator pedal.recomend the diagnostics a

The engine does not need to be raced when cold

The vehicles computer will adjust the idle according
to how the manufacture programmed it

After about one mine or so, the idle on most vehicles
comes down to approx 750RPM, generically speaking

When you put the car in gear,assuming it is an automatic,
the rpm will drop a 100 at most & may be adjusted by the
computer, just as it does when you put the A/C on. That is
to compensate for the change in engine load

You should be waiting for the rpm to come down to 650 to
800 & then a couple more minutes for some temp to come
up, before driving off. In cold weather wait at least 5 min or more

I think your vehicle is not working correctly, or you not explaining
it in a way I understand what answer you want

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