Questions — Module 01: Introduction to Your Vehicle¶
Log questions as they arise — don't wait until you understand them fully. A question written down is a learning opportunity captured. For big-picture questions about the whole topic, use the topic-level QUESTIONS.md instead.
How to Use This File¶
- Write the question the moment it occurs to you, even if you can't articulate it well yet.
- Come back and refine the question once you understand it better.
- Update the status as you research or find answers.
- Link to the source where you found the answer.
- Capture follow-up questions — good answers always raise new ones.
Status Legend¶
| Symbol | Meaning |
|---|---|
| 🔴 | Unanswered — needs active research |
| 🟡 | Partial — have some understanding, still incomplete |
| 🟢 | Answered — well understood, could explain to someone else |
| ⏸ | Deferred — not urgent, revisit in a later module |
Questions¶
Q001: What exactly happens inside the engine during "knock" or "pinging"?¶
Asked: 2026-06-09 Status: 🔴 Unanswered
Full question: The module mentions that high compression requires high-octane fuel to prevent "premature detonation" or knock. But what exactly is happening physically? Is the fuel exploding before the spark fires? What damage does it cause?
My current hypothesis: I think the fuel-air mixture auto-ignites from compression heat before the spark plug fires, meaning combustion starts in the wrong phase of the cycle. This would push against the piston when it's still rising (compression stroke) rather than when it's going down (power stroke), which would feel like a knock.
Answer: To be filled in
Source / Confirmed by: To be filled in
Follow-up questions: - Does knock sensors in modern cars fully prevent knock damage, or just reduce it? - Is knock worse in hot weather or cold weather?
Q002: How do hybrid vehicles handle the four-stroke cycle when the electric motor assists?¶
Asked: 2026-06-09 Status: 🔴 Unanswered
Full question: The module covers the four-stroke cycle for ICE engines. But in a hybrid, an electric motor can provide torque too. Does the ICE still run a full four-stroke cycle when the electric motor is helping? Can the ICE cylinders "skip" strokes somehow?
My current hypothesis: I think the ICE still runs a full four-stroke cycle whenever the engine is running — you can't selectively skip strokes because the valve timing and firing order are mechanically fixed. The electric motor just adds power on top of what the ICE produces.
Answer: To be filled in
Source / Confirmed by: To be filled in
Follow-up questions: - What happens in a full EV? (No four-stroke cycle at all, obviously — but how does the motor work?) - Module 10 on EVs should cover this
Add new questions below this line. Keep them numbered sequentially.
Resolved Questions Archive¶
Move fully answered 🟢 questions here to keep the active list clean.
(none yet)
Question Stats¶
| Status | Count |
|---|---|
| 🔴 Unanswered | 2 |
| 🟡 Partial | 0 |
| 🟢 Answered | 0 |
| ⏸ Deferred | 0 |
| Total | 2 |