1996 Chevrolet 1500 Pickup Q&A
1996 Chevrolet 1500 Pickup Question: what causes a PO300 code
It could be many things, unfortunately and without experiencing the problem first hand or being able to do some basic diagnostic tests its hard to say. The code is for a general misfire, it unfortunately does not identify the cylinder/s that are misfiring. Check the engine basics first, (good even compression), check that the ignition system is in good order, look for vacuum leak at the intake manifold, confirm fuel pressure and volume delivery, and the the fuel injectors spray correctly good clean pattern. Autozone have some popular workshop manuals for free on line once you register (for free) on their website http://bit.ly/autozone_repair_info. There is a company that independent auto repair shops get their information from, this same information is available inexpensively for people that work on their own cars.. The information is year make and model specific, covering repair procedures, torque specifications, fluid capacities and specifications, service bulletins, component locations, wiring diagrams ect.... Alldata is very easy to navigate http://bit.ly/AllData_Repair_Manuals_Online - patrick mannion
The check engine light came on and took it to Autozone came back with two codes PO300 and P1406. So I replaced the spark plugs and wires. I also cleaned the distributor cap and replaced the rotor ...