Skip the auto shop - Our mechanics make house calls

Q: Car running rough and engine races

asked by on

My car starts rough. The engine races and then white smoke comes out of the exhaust. I am not currently getting a Check Engine light or error codes, other than the code P1399.

A: Hi. White smoke indicates that you have a b...

Hi. White smoke indicates that you have a blown head gasket. The motor may have overheated, warping the head and causing coolant to leak into the cylinder. I would recommend a complete engine rebuild for this problem. I would look in the oil fill cap and look for a milky looking sludge built up in the valve cover. That will indicate coolant in oil and a blown head gasket. If you need further assistance, I recommend you have a mechanic, like one from YourMechanic, diagnose your vehicle's smoke issue and for head gasket damage.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Save up to 30%

Get a quote

What others are asking

Q: Engine Light/ Maintenance Required/ TCS Light on

All these codes point to engine misfires. You should pull the spark plug wires to see if oil is on the spark plug wires causing the misfire. You would need to replace the valve cover gaskets and spark plug tube...

Q: My car won't crank or start.

Go under the dashboard by the clutch pedal. Look for the switch that the clutch pedal is supposed to push in when you push the clutch pedal down. The switch is pushed in by the pedal arm rubber bushing that...

Q: Loss of oil pressure in engine - 1998 Dodge Ram 1500

The first task is to determine what is causing the low oil pressure. Only then will we know what the other options may be. Typical causes of low oil pressure are a bad oil pump, low oil level, oil leaks,...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.