alaska_guy

So I bought my car used with 65k miles on it and I was bored and decided to run through hptuners to look at my stock file... This is what I found... The car sometimes would run rough at idle. Which one is correct? The top image from what I can tell is the correct firing order. Why would anyone mess with the firing order? When I pulled my plugs they all looked perfect.

subeone

iTrader: (5)

the PCM is hardcoded to fire the injectors and coils in a particular sequence, the firing order tables that are shown are usually for misfire disagnostics but nevertheless the top sequence is the correct one..

2xLS1

iTrader: (25)

Both firing orders are the same. One just starts with a different number. Makes absolutely no difference on engine operation.

alaska_guy

Thanks for the clarification!