One Stroke @ a Time
Not sure where to start. 97 F350 I believe all mods are in my sig. Also have swamps HVHF IDM if its not listed, nothing major. Truck has almost 252k and has always been maintained. Although for the last 2 oil changes I haven't been able to get to 5k miles, somewhere between 3500 and 4500 it starts to run like hell and act like the IPR is bad. 2 oil changes ago I pulled the IPR cleaned and resealed and it has run fine for the last 4k. Then out of the blue it started doing the same crap, CEL on IPR codes etc. So this time I changed the oil and installed a new IPR back to running fairly well. Pressure stays between 550-585 @ idle calling for 16%. Driving it runs well consistant pressures at full throttle of 2500-2600psi calling for 35-38%, all seems well. Prior to the oil change and new IPR it would randomly go to default pressure readings (don't remember them now) I graphed everything for my test drive and while idling today and got a pressure range of 439.5-3274.6psi through the whole thing. All seems well. Buzz test sounds great, but KOEO and KOER both come back with exhaust back pressure which I'm used to and not worried about, but also P1298 which everyone says is a bad IPR. I'm confused. Harnesses are good, truck runs well. I have had the truck for almost 100k miles and never put injectors in it. Are they getting old and time to replace? I have been waiting for the right time to go larger and add a D66? Is now the time, or does anyone know of anything else that would cause random oil related issues. Also Fuel pressure is good, maintains 55-70psi from idle through WOT. Any ideas or suggestions are greatly appreciated!