P0316: Your engine misfired right after it started
Misfire Detected on Startup (First 1000 Revolutions)
The engine misfired in the first moments after start-up. Get it checked today, since start-up misfires tend to get worse. If the light is flashing, stop driving and have it towed.
Stop driving and get help if
- The check engine light is flashing
- The temperature gauge runs high, or you see steam (overheating)
- The car loses power, hesitates badly or stalls
- You smell burning or see smoke
- A brake warning light comes on, or the brakes feel different
Pull over as soon as you can, turn the engine off, and call a tow or roadside help.
What it means
P0316 is unique: it only sets during the first 1,000 engine revolutions after a cold start. The PCM's misfire monitor is especially sensitive in this window because misfires at startup often mean something more serious than a worn plug. Cold-start misfires that clear once the engine warms up are commonly caused by injectors that dribble fuel during shutdown, causing a flooded cylinder at the next start. They can also point to early fuel injector wear on direct-injection engines or early valve seal deterioration that soaks the cylinder with oil overnight.
Common causes
- Leaking fuel injector flooding a cylinder at shutdownAn injector that does not fully close keeps dribbling fuel, creating a raw fuel pool that misfires on the next start.
- Worn valve seals allowing oil into the cylinder overnightOil draining past the seal soaks the plug and cylinder, causing a startup misfire that clears as oil burns off.
- Carbon buildup on direct-injection intake valvesCarbon deposits restrict airflow to one or more cylinders at cold start when intake air velocity is lowest.
- Worn spark plugs with wide gapA plug at its wear limit misfires under the richer cold-start mixture.
What the fix could involve
From the cheaper fix to the bigger one. Prices depend on your car, your area and the shop, so ask for a written quote that names the part and the labor before you approve it.
- Spark plug replacement
- Fuel injector replacement
- Carbon cleaning (direct injection walnut blast)
- Valve seal replacement
Symptoms
- Rough engine start that smooths out after a few seconds
- Check engine light on, set on start-up
- May feel fine once fully warm
- Possible blue-grey smoke briefly on cold start (oil burning)
What to do next
Check for a companion code like P0301 through P0308 to identify which cylinder misfired. If a specific cylinder is implicated, inspect that injector and plug first. For direct-injection engines with high mileage and no carbon cleaning history, intake valve carbon buildup is a common culprit. Blue smoke on startup followed by a clear exhaust points to valve seals.
Lewis reads P0316 alongside any cylinder-specific misfire codes, so you can see which cylinder is most likely behind the startup misfire. Get Lewis on the App Store or Google Play.
Related codes
FAQ
- The car starts fine when warm. Is P0316 still a problem?
- Yes. A cold-start-only misfire is still damaging the catalytic converter at every cold start. It also often indicates a worsening condition that will eventually misfire when warm too.
- Can bad gasoline cause a startup misfire?
- Contaminated or water-diluted fuel can, but it usually causes misfires across multiple cylinders. A single-cylinder startup misfire points to that cylinder's injector, plug, or mechanical condition.
- What is a direct-injection carbon cleaning and do I need it?
- On GDI engines, fuel does not wash the intake valves, so carbon accumulates over time. Walnut blasting physically removes it. If mileage is past 80,000 miles on a GDI engine with no carbon cleaning history, it is worth having done.
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