#ignition
5 posts in Car Diagnostics blog about "ignition" — OBD-II diagnostics, DTC codes, repair. ← All posts
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Spark plugs: when to change them and why "still working" is not an argument
A plug does not fail abruptly — it degrades, and the coil degrades with it. Types, intervals, and why a dearer plug is not always better.
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Ignition coils: the symptoms people mistake for spark plugs
Coils and plugs produce similar symptoms but are tested differently. How swapping separates them, and why coils die in groups.
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P0335: the crankshaft position sensor — the one the engine cannot start without
The car cranks and never catches. No spark, no fuel, and possibly no codes stored. The sensor without whose signal the control module will not even begin to try.
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P0340: camshaft position sensor — why the car only starts on the second try
The engine will not start first time, occasionally stalls and restarts immediately. That is the camshaft sensor signature: it does not stop the engine permanently, it makes it unpredictable.
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Spark Plugs and Ignition Coils: OBD-II Diagnostics — P030X Misfires
How to diagnose faulty spark plugs and ignition coils with OBD-II: P0300–P0308 codes, Live Data Misfire Count, cylinder elimination method — no oscilloscope needed.