✅ Fixed
Carbon buildup on intake valves confirmed with bore scope. 78000 miles. Walnut blasting performed $550. Smooth idle immediately after.
Ford F-150 2015 3.5 EcoBoost rough idle after sitting
Ford
2015
⚡ Quick Summary
Severity Level
High
Safe to Drive?
⚠️ Drive with Caution
Safety Impact
Can become a safety issue if left unresolved
Urgency Level
🟠 Fix Soon
Engine idles rough for first minute after sitting overnight. Clears up after warmup. This fault code is stored when the engine control unit detects a specific fault condition. Common causes include sensor failures, wiring faults, and component wear. Always read additional fault codes before replacing parts — multiple codes together provide a clearer diagnosis. Clear the code after repair and test drive to confirm the fault does not return.
🔍 Symptoms
📍 Ford F-150
⚙️ Possible Causes
Ford F-150
Possible: Carbon buildup on intake valves confirmed with bore scope. 78000 miles. Walnut blasting performed $550. Smooth idle immediately after.
Repair / Solution
Based on 87 driver confirmations
⚠️ Wrong Diagnosis?
No commonly reported misdiagnoses for this fault yet. If you have replaced a part that did not fix this Ford 2015 problem, submit a wrong diagnosis report — it helps other drivers avoid the same costly mistake.
🧾 Driver Reports
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