service engine soon light on 2002 Chevrolet Trailblazer

Check engine light comes on, Trailblazer is sputtering and reduced power. Took it to local car parts store to have the code read. Cylinder 5 not firing. Okay, that explains it, but where to start to fix it? Spark Plugs? Wires? Injectors? Can bad gas cause a cylinder to stop firing? Filled up just before this happened. The Trailblazer is a 2002 with 69,000 miles on it. never had a major issue with the Trailblazer.

by in Holly Springs, NC on May 10, 2011
2 answers 1 comment
ANSWER by on May 10, 2011
i would replace all the plugs and the coil in number 5. this would be a good start. Roy
ANSWER by on May 10, 2011
Bad gasoline could clog injectors, you have the main culprits fuel, spark, could be a vacuum leak, engine mechanical issues too many possibilities impossible to guess without being able to do some diagnostic test. A professional grade scan tool allows the mechanic to look at all the sensor values to see what fuel trim figures are, air flow into the engine, oxygen sensor values and a lot more. If you want to try looking at the problem your self look at a workshop manual for trouble shooting charts. Autozone have some popular workshop manuals for free on line once you register (for free) on their website There is also a company that independent auto repair shops buy their information from that the same information inexpensively to do it yourselfers. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate
COMMENT by on May 10, 2011
Thanks Guys. I'll see if I can have a diagnostic check done at a local repair shop and take it from there. Any tips on dealing with all of the covers, sheaths and general pain in the neck positioning of parts, nuts and bolts in this car? Up till this vehicle all of my cars pre 1990 Hondas that were quite simple to work on. Changing a head light bulb in the Trailblazer involves removing the entire front grill. Changing out the battery can be as equally challenging. It's like the folks at Chevy intentionally made it difficult for DIY guys to work on it.
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