Q: car running very rough, making oil 1990 Nissan/Datsun 300ZX

asked by on

The car was running great. The next morning when it was started it was smoking very badly and barely ran. I checked the oil, it is over full and smells like gas.

My car has 70000 miles.
My car has a manual transmission.

Hello - I suspect your cold start system has gone "full on" or you have leaking injectors. Without question your fuel system is pumping way too much fuel into the intake, leaking past the piston rings, and entering the crankcase. I would recommend a engine fuel system inspection by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. car running very rough, making oil 1990 Nissan/Datsun 300ZX

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Stereo turns off and lights flicker when I turn up the volume on the stereo.

Hi there. If you have a factory radio, then the volume knob switch is shorting out with the radio controls causing the radio to shut off and flicker the lights. If you have an aftermarket radio, then there could be...

Q: Clutch won't work and the clutch pedal has no pressure.

Hi there. Check the slave cylinder and see if its moving. There could be a leak on the slave cylinder causing the slave cylinder not to operate. Also, check the pin to the clutch pedal and make sure that it...

Q: Won't start after fueling - 2008 Kia Rio5

Check for spark at the plugs when this occurs. If there is no spark, check for a bad crankshaft position sensor (heat failure), and also for a failed connection between your ignition key, which is part of the electronic path...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.