Question about 2005 Chevrolet Silverado
Multiple misfire is determined by the O2 sensors. misfire can be the result of spark not reaching the cylinder from the coil (due to bad plugs/wires), or it can be the result of the coil not initiating the spark or not being told to initiate a spark by its inputs. if the tune up did include plugs and wires and was done without damaging any new components (broken plug during install, separated wire from connector inside boot, etc.), then perhaps the source of the misfire is in the primary ignition components (coil pack, crank sensor, ECM, etc.). Recommend wiggle each wire near the plug to ensure there is no broken plug or broken wire connector. This is more reliable if done while the engine is running, but know that if there is an arc somewhere in the secondary ignition it very well may shock your fingers (this is not dangerous, but better to be prepared than surprised by it)
Posted on Sep 29, 2009
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Posted on Jan 02, 2017
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