Q: Rough idle, smoking,CEL on

asked by on

My 2000 celica is smoking, getting misfire codes and idling so low that it dies. Pulled codes (p0300,301,303,304) replaced all plugs and checked coil packs(good). There is lots of smoke and the smell of gas is terrible. I looked around for possible exhaust and air leaks but found none. Please help

My car has 150654 miles.
My car has an automatic transmission.

Hi there. The P0300 OBD-II trouble code typically indicates that there is a misfire in random or multiple cylinders. The other codes indicate that the misfire is being registered in the first, third and fourth cylinder. This is most likely why you’re engine is running rough. The best thing to do is have a professional mechanic complete a car is running rough inspection, so they can determine why the cylinders are misfiring and causing the symptoms you’ve described above.

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. Rough idle, smoking,CEL on

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: My toyota isis platana dashboard lights "car and key symbol", when i insert the key, it turns off. What happens ? Please !

When you turn the key to the run or start position, the immobilizer warning light on the dash will typically illuminate briefly as a bulb or system check. Once the vehicle starts the immobilizer light, and all other warning lights,...

Q: Car leaking fluids

It sounds as though you may need a technician to come out and perform a test on the system to determine where the problem is. A mechanic from YourMechanic can come to you and check the battery, and determine why...

Q: The car shakes during braking and at stop lights, error code P0420

Hi there. The P0420 code you are getting can cause your car to run like this. The code typically means that the catalytic converter is failing or one of the oxygen sensors may be failing. If it was the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
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...