I have a 2001 chevy silverado 1500 4.3ltr 6 cyl. Today the check engine soon light is flashing. What does that mean? I just changed the plugs and plug wires
When the light comes on without flashing, it just means an emissions problem, when it starts to flash it has become more serious. I suspect that there was an error putting the plugs and or wires. That computer can determine if there is a misfire and it will put out a P040X, code where X represents which cylinder is the problem. This will help you not have to take each one apart. If there are more than one, check each number.
Ex. P0401 means there is misfire on cylinder number 1
P0400 is a random misfire detected.
If you take it to an Advance or Autozone they will usually scan if for free.
By the way, if you used cheap plugs instead of platinum plugs that could do it too.
Hope this helps.
It means that the emissions controls are comprimised, get the engine scanned, most probably the o2 sensor
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Most Autozones will read the code for you for free, and possibly clear it. Try to get the code, and repost it.
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