Check Engine Light Demystified Could Spark Plugs Hold the Key?

The spark plug wires deliver the spark from the ignition coil to the spark plugs. If your spark plugs or spark plug wires are bad or old, you will experience a ... Until then, the systems are "not ready" and do not throw a DTC, nor will the MIL be lit. Bad plugs or wires would cause some sort of misfire, ... Comments ; CHECK ENGINE LIGHT STILL ON & STILL MISFIRES AFTER CHANGING SPARK PLUGS ? THIS COULD BE WHY. Shaners Mechanic Life · 50K views ; EASY: ... I've had my Check engine light on for a couple of months. I took it to the dealer and was told that it was code P0171 - System Too Lean - Bank No. 1 (and ... When you start any vehicle without something plugged in, your definitely without a doubt going to receive a check engine light as the PCM is detecting some ... Old or worn spark plugs can cause your engine to knock and misfire, resulting in disastrous and costly consequences. Here are four signs that it's time to ... Bad spark plug wires can also cause your check engine light to come on. Battery Issues. Your vehicle's battery is another important component of engine function ... Changing spark plugs could be a good idea when… · Worn plugs can trigger your check engine light to come on. · This can cause your engine to misfire and your ... Worn spark plugs and plug wires can cause clogged catalytic converter or damage to ignition coils and O2 sensors, extensive to more expensive repairs. Your mass ... Hey all- Today I replaced my spark plugs and engine air filter and everything went well, however the check engine and VSC TRAC lights are now on and I.