5.7 has the sniffles
Posted a thread on B bodies but I guess
I'll ask here since there are new hemi owners. 103,000 mi 2013 ex Michigan State Police Charger 7000 hours on engine and 5000 idling.
Great price. #2 cylinder "funny".
Changed:
Plugs ( had very hard black deposits)
Coil Pack (by Mich St Pol previously)
Fuel injector
Engine control module (as I had noted weak signal to injector during misfire).
No better.
Many applications of Sea Foam and Marvel Mystery Oil and there was a change. Instead of a big miss under load at 1500 rpm, THAT went away and became a light roughness at lower speeds.
I think the exhaust valve got stuck in one spot, and now it's rotating, but landing on a seat of hard carbon that only fits well and seals efficiently in one spot.
So I have driven a thousand miles since the change and while I want to believe a rotating valve will eventually clean off the carbon on the seat and itself, I've never had this situation before. I know that anything that "partly heals" is good because something real like a burned valve or seat never gets better.
It definitely is smoother now at idle and while it does still throw P203s, especially right around 1500 rpm, it is doing it less.
So the question:
Let's say this valve didn't rotate for 6000 miles. If it built up deposits on the seating faces, and didn't burn the valve or seat,
how long do you think it might take for normal rotating operation to beat the deposits off to where that valve seals better?
j
Posted a thread on B bodies but I guess
I'll ask here since there are new hemi owners. 103,000 mi 2013 ex Michigan State Police Charger 7000 hours on engine and 5000 idling.
Great price. #2 cylinder "funny".
Changed:
Plugs ( had very hard black deposits)
Coil Pack (by Mich St Pol previously)
Fuel injector
Engine control module (as I had noted weak signal to injector during misfire).
No better.
Many applications of Sea Foam and Marvel Mystery Oil and there was a change. Instead of a big miss under load at 1500 rpm, THAT went away and became a light roughness at lower speeds.
I think the exhaust valve got stuck in one spot, and now it's rotating, but landing on a seat of hard carbon that only fits well and seals efficiently in one spot.
So I have driven a thousand miles since the change and while I want to believe a rotating valve will eventually clean off the carbon on the seat and itself, I've never had this situation before. I know that anything that "partly heals" is good because something real like a burned valve or seat never gets better.
It definitely is smoother now at idle and while it does still throw P203s, especially right around 1500 rpm, it is doing it less.
So the question:
Let's say this valve didn't rotate for 6000 miles. If it built up deposits on the seating faces, and didn't burn the valve or seat,
how long do you think it might take for normal rotating operation to beat the deposits off to where that valve seals better?