08 Silverado w/ check engine light on
I have a 08 Silverado 4.8L. The check engine light came on. I took it to Auto Zone. They said cylinder #4 is misfiring. Probable cause is faulty spark plug, wire or core. I have all the items replaced, and the light came back on and Im getting the same code after replacing everything new. Does anyone out there know what the problem may be. The truck only has 78K on it and runs like a top, but I hate seeing that light on.
unhook your battery,eather side for about 10 minutes,it will clear the code from computer and light will go out.
is it a dead miss?
Ill give it a try. I had Auto Zone clear the code with the computer, and it stayed off for a day, then came back on.
I DONT HAVE THE ANSWER BUT MY TRUCK IS DOING THE SAME THING, BUT THE CHECK ENGINE LIGHT COMES ON AND THEN THE CONSOLE READ A/C OFF ENGINE HOT BUT MY ENGINE IS NOT HOT. NOW MY AC WILL NOT COME ON
take it to a dealership and have them check the engine if the 4th cylinder is missing there may be a problem with the engine if it's under 100k they should replace it for you they did on my cobalt at 76k
does it sound rough when it runs that would confirm a missfire as a probability it could be causted by a mistiming
sounds like a coil pack for # 4.
most common problem is bad lifter for missfire , you also hear slight noise , yes as jean stated the warrenty is 5years 100k so dealer can warrenty that
fdaniels< i had the same thing happen to mine it turned out the thurmostate was bad, powertrain covered it.
I drive 100 miles per day. My 4.8 dropped cylinder 4 at 116000 miles. Ran great with a little rough idle once in a while. Dealer serviced regularly.
Did you ever find out what the problem was I have the same issue I have changed my wires plug and the coil and it is still lighting up check engine misfire 4 my ruck is past warranty I'm 180000 miles thus is the only problem with the truck it's in excellent condition besides this
I have two Colorado's I've been told that a code reading misfire on cylinder 4 can be bad catalytic converters as well.
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