Rough idle??

[bronx79]

So as of the last week or so my truck has a rough idle when not quite up to temp.. Once it warms up it seems better to fine but this has never been a prob before! Plugs are new as of last Aug and TB was cleaned last summer as well. Truck has also almost stalled once or twice when it was cold and then put in gear and given gas... Any suggestions as to why this behavior lately?

 

[KGBIGCOUNTRY]

Did you install the headers yet? If so could be the PCM trying to compensate to get the correct A/F reading and makes it go loopy. You can turn defrost on and will bump up idle 150-200 rpms during warm up to help.

 

[bronx79]

Headers have been on for over a year...

 

[KGBIGCOUNTRY]

Damn time flies lol. Have to tried a PCM reset? Did it just start after a fill up and could point to just a bad batch of gas? I know mine will do it once in awhile when its dead cold in VA but alot of that is the PCM fighting the 112LSA cam so I have the defrost on to help it. Any other changes as of late or recent?

 

[bronx79]

Nah all is the same and that was always the nice thing about this truck is that you literally couldn't feel it running! Ram like a top. This morning it was much better so maybe just crappy gas. It was a very damp wet snowy day when it does this and the truck runs lean to begin with so maybe the weather?? I'm gonna replace the IAT and MAP sensor this week and do a reset to see if that helps. Need a tuner in the worst way!!!

 

[KGBIGCOUNTRY]

Yeah fuel could have been acting up or quick changes in weather. IDK about your area but it was 62 here last friday and then saturday just broke 30 with snow so it plays hell on the crappy fuel we have to buy. Matt looks like he has a good deal on the Trinitys at the moment.

 

[bronx79]

Yeah I was wanting to pick up a intune from him. What the diff between that and the trinity?

 

[KGBIGCOUNTRY]

Wanna say the INTUNE you can download stuff for other cars/trucks but double check with him to make sure. I have only messed with the older Preditor and the Trinitys at the shop.

 

[bronx79]

What's the name if the sensor that regulated fuel/air ratio?

 

[KGBIGCOUNTRY]

The front o2's read it and the PCM adjusts from there.