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: Ran car with no oil, car stopped on hwy what to do now?

Hello There, Unfortunately, it sounds like your car may have had some catastrophic damage due to running it without any oil. Depending on how long and how low the oil levels were when you drove it prior to it shutting...

Q: Q: No 3rd or 4th gears

Hi there. Typically when an individual gear is hard to shift into with a manual transmission, it's an internal gear failure inside the transmission case or linkage issue. When all gears are hard to shift, it's likely the clutch. Since...

Q: My girlfriends 2006 Toyota, 6 cyl, 4WD 4Runner's fuel gauge reads 1/4 tank when actually empty. What could be most likely cause?

Hello, and thank you for writing in. On most newer 4Runners, the fuel pump includes the fuel level as part of the unit commonly referred to as a fuel module. It is likely that the level is not calibrated, dirty,...

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 Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...