taterthedog
Active member
My daily beater 7.3 is starting to become a thorn in my side. First I'll give the specs. 2001 F250 sclb auto 4x4. ~250k Kms and probably that again idling. It was a company truck and it's very cold here in winter. Mods: 6637 style intake, 4" turbo back, no muffler, Beans 6 pos, BTS trans. Plus little things like boost fooler, intake air heater delete, gauges etc.
It has 110 psi compression on #7, wet or dry. I wasn't driving in the winter because it wouldn't stay going on startup. It would start, run for a minute or so, then slowly lose ICP pressure till it stalled. After a few minutes it could be restarted and would do the same thing. After a few times it would stay going and run fine the rest of the day, except on longer trips, same as now.
With warmer temps start up is fine but still acts up on longer trips.
After 30 miles of so on the highway it begins to lose ICP. First shows up when trying to pass or high throttle input. ICP will drop till pedal is released, then will spike to 3500 or so and will chug a bit, then level out. It gets progressively worse the longer you drive, till it will barely climb hills. Today we had to pull over and shut it off for five minutes or so, then on restart it was fin for about a minute and then started to lose pressure again. That was enough to get it up the last hill, and we made it to our cabin. I changed the IPR and it still does it, ICP sensor has been changed. Changed injector o-rings. No change. It does go through a bit of oil. I have an OBS engine on a stand to put in it, but would like to figure out the issue first, since I have to switch over some parts. My next step is to switch injectors 5 and 7 and retest compression in case it is losing it through the injector. Those are my current thoughts but I'm open to advice. Thanks,
Brad
It has 110 psi compression on #7, wet or dry. I wasn't driving in the winter because it wouldn't stay going on startup. It would start, run for a minute or so, then slowly lose ICP pressure till it stalled. After a few minutes it could be restarted and would do the same thing. After a few times it would stay going and run fine the rest of the day, except on longer trips, same as now.
With warmer temps start up is fine but still acts up on longer trips.
After 30 miles of so on the highway it begins to lose ICP. First shows up when trying to pass or high throttle input. ICP will drop till pedal is released, then will spike to 3500 or so and will chug a bit, then level out. It gets progressively worse the longer you drive, till it will barely climb hills. Today we had to pull over and shut it off for five minutes or so, then on restart it was fin for about a minute and then started to lose pressure again. That was enough to get it up the last hill, and we made it to our cabin. I changed the IPR and it still does it, ICP sensor has been changed. Changed injector o-rings. No change. It does go through a bit of oil. I have an OBS engine on a stand to put in it, but would like to figure out the issue first, since I have to switch over some parts. My next step is to switch injectors 5 and 7 and retest compression in case it is losing it through the injector. Those are my current thoughts but I'm open to advice. Thanks,
Brad
