Misfire Issues?
Thread Starter
Launching!
Joined: Mar 2004
Posts: 233
Likes: 0
From: Dallas Texas
Misfire Issues? OK guys I'm a total Nube here as I just recieved my HPTuner setup 3 days ago.
I've done the first steps and shut off the AIR / EGR codes and Cleared out 80% of the TQ managment and raised the Idle up to 700RPM range. I'm fixing to start trying to get my LTFT zero'd out but I noticed I keep throwing a Misfire 0300 code and figured I better get that ironed out before starting to 0 out the LTFTs.
My question is how do can I diagnose this issue with HPTuners?
I read someware that it could be false misfire from having a big cam and I think there was something about changing the peramiters of the misfire detection so it will not triger on low rpm misfires from the large cam? Is this valid and if so how does one change the peramiters?
Thanks for your help Guys!
I've done the first steps and shut off the AIR / EGR codes and Cleared out 80% of the TQ managment and raised the Idle up to 700RPM range. I'm fixing to start trying to get my LTFT zero'd out but I noticed I keep throwing a Misfire 0300 code and figured I better get that ironed out before starting to 0 out the LTFTs.
My question is how do can I diagnose this issue with HPTuners?
I read someware that it could be false misfire from having a big cam and I think there was something about changing the peramiters of the misfire detection so it will not triger on low rpm misfires from the large cam? Is this valid and if so how does one change the peramiters?
Thanks for your help Guys!
I would like to know this as well. Mine started right after I got my cam in. Im going to change my plug wires and see what that does, but I would like to know more. Im sure others have had this happen.
Yep, very common. Fill the whole idle and low rpm table with 32,000. If that dosen't do it, make the minimum temperature the same has the maximum; that's what I finally did. Just depends on how much intake/exhaust overlap your cam has.
You can get it from a lightweight converter and/or
lumpy cam, or you can get it from actual problems.
Try logging all 8 of your Misfire-Current cylinder PIDs
and see if there's a "sore thumb", vs a random popcorn
action. The former is trying to tell you something, the
latter says just raise the bitch threshold.
lumpy cam, or you can get it from actual problems.
Try logging all 8 of your Misfire-Current cylinder PIDs
and see if there's a "sore thumb", vs a random popcorn
action. The former is trying to tell you something, the
latter says just raise the bitch threshold.
Thread Starter
Launching!
Joined: Mar 2004
Posts: 233
Likes: 0
From: Dallas Texas
Ok I had 1 box in the one of the low Rpm misfire tables that was set to like 17225 and all the other boxes were already at 32227. I bumped up the 1 box to match the others and I haven't really seen it again. Well at least not yet, I'll keep my fingers crossed. 
