Cylinder misfire and white smoke from exhaust
An engine misfire persisting on the same cylinder despite replacing spark plugs and checking coils, combined with white exhaust smoke, typically indicates coolant entering the combustion chamber. This can foul the spark plug and lead to ongoing misfires and smoke.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
- 1Replacing spark plugs
- 2Checking coils
- 3Taking the vehicle to a professional
In their words
Unedited, most upvoted first, each linked to the thread it came from.
“Misfiring on cylinder one, replaced all the spark plugs 6 months ago, all the coils are fine. Misfiring again on cylinder one checked the coils. Pulled the spark plug and it was filthy and black. Replaced it. Still misfiring, but now I also have white smoke coming out the exhaust.”source ↗
“I was asking because I had a problem 2 days ago after work I started the car and it smoked a blue smoke after 1-2 mins and it went away after 30 Seconds but didn’t happen since so I’m confused on what’s was that all about”source ↗
Where this came up
People with this problem also raised
- 18Why does my car run terribly and stutter after a long drive?
- 8Engine misfires and RPM surging when driving uphill
- 15Why are my oxygen sensor readings going crazy during a misfire?
- 9Why does my car engine cut out after driving for a while?
- 4Engine smoke and burnt coolant smell while driving
- 3Smoke and oil leaking from engine bay after driving