I've got a very rough running 7.3, 97OBS. It runs like it's missing on 4 cylinders when idling, particularly hot. If it's cold, it runs better when idling, and after it warms, it gets worse. I have an obd
dongle, and loaded the pid's for the psd
. my ICP
reads around 550-600, and the IPR
reads about 12-14%. I think that is within spec, and it kind of stopped me in my tracks as i thought some o-rings were bad and was getting ready to replace them all.
I did just complete e-fuel conversion. No change other than no more fuel leaks.
Found some online tech info that suggested checking for flywheel balance if m/t, mine is. Also, suggested a compression check, which i don't really have a way to do so at this point, particularly if the engine shows signs of bad air filter. I did buy the truck in Texas and the moron who had it before had a K/N filter on it, and the turbo blades are chewed up. Would a worn cylinder really cause this much of a bad idle? It seems to run much better at higher rpms. Running down the road smooth, i get like 18 mpg
, with a crew dually and 4.10's. I can't believe the mpg
would be so good with worn cylinders.
Recent maintenance: New glow plugs, battery cables, UVCH on one side, (obvious bad burned wire) and all circuits ohmed out good when done. Glow relay, efuel. Haven't dug into sensors much yet. The buzz test had them all buzzing about the same. I was going to do all injector o-rings and ipr
orings next. then the readings i finally got look ok, so i don't know i want to pull all the injectors yet.
Any wisdom here PSN gurus?