September 12, 2016 at 5:19 pm #139094
I’m getting really frustrated with my pickup right now. I have to continuously take my truck into the dealership with check engine lights. The first 2 times they replaced the spark plugs. The third time they replaced a spark plug wire. The forth time they replaced another spark plug. The fifth time, they replaced two spark plugs and the valve cover on the drivers side. Now for the sixth time, they think putting in new pistons will fix the issue. Between the 5th and 6th time we are talking about 3 days.
Last Thursday was the fifth time I was there and after I left the dealership, it was running great. Then on Sunday, I went to the store and when I left, I started up my truck and it started miss firing again. The dealership told me this morning that it was a random miss fire code.
On the 5th time it happened, I drove the interstate for a good 45 miles and the miss fire cleared up on the way.
On my way home from the dealership today, ran it pretty hard hitting 4k RPM between shifting, by the time I got home, it stopped miss firing.
I am sitting here wondering if anyone else has had this issue. I am also wondering if the new pistons will fix the issue or if it is something else like a coil pack or something.
September 13, 2016 at 2:14 pm #139178
Hello–what engine and how many miles–typically misfires are caused by bad wires,plugs or coil packs.if the same cylinders keep misfiring, try swapping coil packs to see if the misfire moves to different cylinder,that will prove its a coil pack, you will need a scan reader to see which cylinders are misfiring.you can also find the misfiring cylinder by looking at the spark plugs removed,the misfired plug will be more fouled with carbon or wet with fuel.If the misfires are random each time you check with scanner than you could have a computer problem,there are driver circuits in the computer that control the coil packs and driver circuits for the injectors also.I have a 2012 1500 with a 525–36k miles, no misfires.one more way to tell which cels are misfiring is to use a timing light with induction pickup on each wire while engine runs,if light flashes its firing,no flash not firing.–good luck.
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