Q: my car has a rough start

asked by on

When the engine is cold, it has a rough start and feels like it's gonna stall out, it also blows out black smoke, I recently changed the spark plugs, oil and air filter. I took out one of the spark plugs and 1st, 2nd and 3rd where lightly covered in oil, the 4th one was just fine. What could be the issue?

If the spark plugs are coated in oil, that can cause a rough cold start or idle. The engine is burning oil in cylinders 1, 2, and 3. The most typical cause is from worn valve guides. The intake and exhaust valves move up and down within the valve guides. When they wear, oil can get past the valve stems, coating the spark plugs. Other causes can be worn piston rings and/or scored cylinder walls. A complete compression test should be done to determine which is the cause. Worn valve guides can be remedied by rebuilding/replacing the cylinder head. Worn piston rings or scored cylinder walls may require an engine rebuild/replacement. Have a trained technician inspect the starting issue in order have the right repairs made.

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. my car has a rough start

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: Engine overheats with new radiator, new thermostat and fan relay

It is normal for the lower hose to be significantly colder than the upper hose, but it should still be warm. The upper hose should be almost too hot to touch with bare hands, and the lower hose should be...

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 car randomly shuts off - 2007 Nissan Sentra

Hello. You'll need to start by having the battery load-tested and charging system checked. You may need to clean the battery terminals of any corrosion since this may explain the intermittent no crank with just clicking. Your starter may also...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...