İpucu
Arıza kodu P0301
P0301 instead of P0300: the cylinder number is a head start
CA
@cargeek
1 ay önce
A cylinder-specific misfire code has already done half the diagnosis for you: the problem lives in, or is delivered to, cylinder one. That collapses the suspect list to that cylinder's ignition, its injector, and the cylinder itself — in that order of likelihood and cost.
Make the parts prove themselves before buying anything. Swap the coil with a neighbouring cylinder, clear the code, drive. If P0302 appears, the coil carried its fault along and you have your answer for the price of ten minutes. The same swap logic works for the plug and, on many engines, the injector.
While the plug is out, read it — it is the cheapest borescope you will ever use. Oil on the threads says valve-stem seals or rings; a fouled black tip says it has been misfiring rich for a while; a chalk-white tip says lean, and the misfire may be a symptom of an air leak rather than an ignition fault.
If the code stays on cylinder one after ignition and injection have been swap-tested, it is time for a compression or leak-down test — the mechanical causes (valve, rings, head gasket) are the expensive third of the list, which is exactly why the swaps come first.
Make the parts prove themselves before buying anything. Swap the coil with a neighbouring cylinder, clear the code, drive. If P0302 appears, the coil carried its fault along and you have your answer for the price of ten minutes. The same swap logic works for the plug and, on many engines, the injector.
While the plug is out, read it — it is the cheapest borescope you will ever use. Oil on the threads says valve-stem seals or rings; a fouled black tip says it has been misfiring rich for a while; a chalk-white tip says lean, and the misfire may be a symptom of an air leak rather than an ignition fault.
If the code stays on cylinder one after ignition and injection have been swap-tested, it is time for a compression or leak-down test — the mechanical causes (valve, rings, head gasket) are the expensive third of the list, which is exactly why the swaps come first.
Ekler
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Diagram: the coil swap test — move the coil to a neighbouring cylinder, clear the code, and see whether the misfire follows the part.
Bilgi amaçlıdır, talimat değildir
CarGeek bir başvuru kaynağıdır, servis el kitabı değildir. Sayfaları kamuya açık kaynaklardan ve başkalarının tespit ettiklerinden yazılır; hiçbir zaman üreticinin kendi servis belgelerinden yazılmaz. Bu nedenle sizin aracınız için yanlış veya eksik olabilir. Anlatılanların bir kısmı gerçek risk taşır: yüksek gerilim, basınç altındaki yakıt, depolanmış enerji, sıcak ve hareketli parçalar.
Uygulamayı düşündüğünüz her şeyi, aracınız için üreticinin kendi prosedürüne göre eğitimli bir kişiye doğrulatın. Buradaki hiçbir şey o prosedürün yerini tutmaz.