Check engine light on with P0300 code "random misfire". Replaced ignition control module, coils, and spark plugs. Check engine light came on again with same trouble code.
Did you replace the wires? What kind of car?
SOURCE: 2000 Pontiac Grand AM trouble code P0300
Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.
SOURCE: Random Cylinder Misfire
Get a Haynes manual for your vehicle and use the troubleshooting guide there. about $20 from amazon, auto parts store or haynes.com. This WILL save you time and shortcut this and any future diagnosis. Haynes IMHO are top notch and I like them better than some factory service manuals that fgo for $100 and more.
David, 99 Saturn, Cam position sensor codes seem to indicate a engine timing (not spark, but crankshaft/camshaft sync). Old timing belts or worn tensioners can cause belts to jump a tooth or two which can have a pretty dramatic effect. The belt could also be old/dryrot and have lost a tooth or two causing it to jump. If any of these are the case, or if the timing belt interval is near, replace timing belt, tensioner, idler roller if present and water pump. FYI, quality OEM ignition wires shold last at least 10 years. If they are really bad, you can open the engine compartment on a dark night and you will see sparks arcing between them and/or something metal nearby. We all replace wires when we are not sure what the problem is, and regardless of what anyone tells you, it only rarely solves anything unless the car is more than 10 years old.
good luck.
SOURCE: Random engine misfiring- fault code P0300- 1999 cutlass
Could be coil pack(s), fuel injectors, etc. Rather than retype it, just check out this great article on P0300 random misfire - http://www.obd-codes.com/p0300
SOURCE: My 2001 Grand Am is randomly misfiring. Have
Has the ECM been checked, and all the igniotion connectors.
Have the fuel injectors checked you may have a bad one or two, or possibly bad gas, or a low fuel pressure problem.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/sean_54c3a3dc48a7773c
SOURCE: 2.2 ecotec engine. Code says random misfire. What
did you fix it? if you did what did you do? i have the same prblm thanks!
P0300....Random/Multiple Cylinder Misfire Detected
so its got a misfire and quickest way out here to avoid a expensive garage visit is to change plugs and Ht leads and see what happens ,HT leads is proper english for fire wires by the way ,see iam learning american ---slowly---
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