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Did about 90 miles driving round trip this weekend for a camping trip. 8 ft bed is much roomier than a tent.
Truck held up well to the driving in terms of performance. Transmission temps were fine, and the transmission itself was okay aside from some 4th gear or torque converter "hunting" one or two times. @Sous I checked the up-pipe gasket when we got home. Aside from some material flaking off from the exposed portion of the gasket (to be expected since it's not sandwiched between anything), it seems to be holding up. When we take the transmission out I'll remove the gasket to see the condition of the interior metal ring.
The idle sound and deceleration/idle knocking was worse than ever. The camp ground had a few other 7.3s and it was, frankly, embarrassing to have the only one that sounded like a lemon. As usual I took videos but they simply don't communicate how loud or frequent the knocking is. In addition to the knocking the idle character sounds... different after driving for a while. Instead of clear it sounds muddy, as though one were listening through a tube or something.
I think I might go through the effort of warming up the engine, removing the valve covers, and start unplugging injectors until I can find the one(s) making the noise. My big fear is that this is an engine bearing or piston issue that would require the motor to be pulled and rebuilt. That being said, this noise never happens when the injectors aren't firing (taking foot off the gas at high speed), which suggests it's an injector issue. It could be an injector not seated all the way, but if that was the case I'd expect to find fuel, oil, or coolant mixing which I have not noticed, nor have I noticed blue smoke. Small, momentary puff of black smoke when flooring it, but that's all.
What’s your ICP when it’s knocking? Recently saw a thread where a bad IPR was making high ICP and he had a knock.
This should take you to his post with the video he found describing the issue. https://www.ford-trucks.com/forums/1...l#post20023353
I'll have to check or do a log next time I run the truck. I think it's within normal range though. The IPR solenoid's resistance is in spec, and I completely stripped, cleaned, and rebuilt it with fresh o-rings.
I’m not sure disconnecting the ICP would work in the case like in the video. The IPR was only commanded like 3% but it was still producing very high ICP values. I doubt this is Priuslover’s issue but figured it was at least worth a check of the ICP readout when it’s knocking.
Here’s a direct link to the video from the post above.
Yeah I'm assuming if there were deeper issues like bearings, cranks, cylinders, etc there'd be mechanical vibration to accompany the sound, and that it would manifest whenever the components were turning/moving.
For the gasket to fail the compressed metal inner ring would have to break up, and it would have to do so while not losing the seal as, if the seal was lost, the high pressure inside the pipe would blow out any particulates to the lower pressure atmosphere. That's not a failure mode I think is likely. That being said, given that this gasket was not designed for this application, I'm mostly viewing it as a temporary fit until I can locate or fabricate a copper gasket.
Yeah I'm assuming if there were deeper issues like bearings, cranks, cylinders, etc there'd be mechanical vibration to accompany the sound, and that it would manifest whenever the components were turning/moving.
For the gasket to fail the compressed metal inner ring would have to break up, and it would have to do so while not losing the seal as, if the seal was lost, the high pressure inside the pipe would blow out any particulates to the lower pressure atmosphere. That's not a failure mode I think is likely. That being said, given that this gasket was not designed for this application, I'm mostly viewing it as a temporary fit until I can locate or fabricate a copper gasket.
For example, this is one candidate:
That looks pretty decent. Where did you find that?
It's a Walker 31543. Made for a Samurai's exhaust system evidently. ID is 1.5 inches so need to open it up a little, but aside from that, it's a great fit. The question is whether the clamping force from tightening the bolts will be high enough/evenly distributed enough to compress the copper and make a seal.
Did some driving with it today, mixed city and freeway. Per the gauge my highest ICP was ~3100 @ ~53 IPR @ >3ms PW. A good sign, but I need to find a good strench of country road to record some data on.
I've isolated the intermittent idle/decel knocking sound to the driver side head. The knock is loud enough that I can feel a vibration in the floor when it happens. That side has all original injectors save for #8 which is Alliant... curious if that's the one making the sound.
After some pedal punching I noticed the idle sounding pretty bad at a stoplight.
