May or May Not be a Bug

[Kaneman]

I had posted up about HP scanner showing a misfire on my engine on cylinder #1. We identified that it had to be false because with all of the testing we had done we knew the cylinder was firing. My motor is a 370 Iron block with a 220/224 581 581 115 lsa. I just recently installed another 370 Iron block with a big cam 330\342 580 112 lsa. Just for the heck of it I ran my misfire configuration and it was doing the exact same thing to Cylinder #1 the misfire was all over the place.

Has anyone else had this happen?

Kane

[Dirk_Diggler]

Have you turned the misfire detection logic donw on the PCM

[Kaneman]

I went into the DTC and upped all of the misfire settings. The PCM used to through a misfire code and it no longer does that. Is there another area to edit?

Kane

[Kaneman]

I was playing with another Ls1 cam'd car and decided to run the misfire configuration I setup to monitor the cylinders and again it shows #1 with a random misfire?? I have changed the misfire settings in the engine diagnostics is there somewhere else to make changes so random misfire code is not sent to the scanner? It does not do it with Stock LS1's??


Kane

[Dirk_Diggler]

The logic the pcm uses to determine misfires is kinda thrwon off with a cam esp ones that have some lope. Ususally most people set the misfires in the low rpm tables to 32677 or someting like that. This takes care of the misfire problem