2003 Chevrolet K1500 4x4 multiple miss fire code P0300
2003 Chevrolet K1500 4x4 106,000 miles, multiple miss fire code P0300, Code only appeared after the spark plugs and wires were replaced?? Was only performing basic maintenance. the truck ran fine before this. All connections are good and secure, replacing plugs and wires is usually pretty straight forward. Now Idles rough, starts sluggish, seems to run fine at higher rpm's but Fuel mileage has greatly decreased. Any help or idea's would be greatly appreciated.
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these codes indicate there is a miss fire on cylinders 1 and 2 hence the 0301 and 0302 code the 1300 just indicates multiple engine miss fires. so anything that can cause these cylinders to miss fire need to be attended to in order to fix your problem.
You can't rule anything out yet. It could be a plug or injector among other things, but probably not low fuel pressure. If you have a code 300 and nothing else, you may have to wait until the problem gets bad enough to set additional codes. And if any of the sensors fail, such as the cam or crank sensors, you'll get a code for those to be tested.
Have the plugs been checked or replaced in the past 30,000 miles ?
multiple code issue (evaporative, catalyst efficiency, and miss fire)doubtfull all 1 source of error but draw attention to the miss fire code PO300 is a random cylinder miss fire, possible crank position or cam position sensors.but i would check timing first.
Is the check engine light on? An OBD II code P0300 - Random/Multiple Cylinder Misfire Detected could indicate a bad crank position sensor causing a misfire. Another possibilty would be the coil or distributor cap. The 95 and 96 were notorious for burning distributor caps. My 96 used to burn one once a month which is why Chevrolet stopped using them and went to multiple coils. More information would be helpful in diagnosing the problem
No I don't think so, knock sensor only work under engine load, when sensor picks up a ping or knocking, it will adjust timing, o2 sensor could be bad, and will save you fuel mileage, but a miss will also give you an o2 sensor code, running rich, have him check for cylinder miss first.
The first thing to check is the fuel pressure regulator. It is a round device on the fuel rail with a vaccuum line on it. With the motor running pull the vac line and see if fule comes out, it should not. Map sensors can cause this but will almost always set a code. If I can help let me know. Good Luck
you sure its missing and not a torque converter shudder . as a auto tech some times its hard for me to tell the difference. it it was missing it would throw a miss fire code not a torque converter code at 126 k sounds the the trans needs to come out and a good tech needs to rebuild it