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2000 F250 7.3 diesel - because I have 353k miles I thought I would do some preventive maintenance. Installed a new stock turbo, adrenaline hpop, rebuilt stock injectors, 4 inch exhaust no muffler, remanufactured tranny 4R100. New injector/glow plug wiring and glow plugs. New ICP valve and sensor. All wiring and sensors from Ford. Edge tuner, tuner is set to stock tuning. Prior to all of this I would get P1247/48 dtc. Well still getting the same codes and occasionally a P1316. I'm leaning toward the map sensor, cut the ends off of the tubing just to be sure of no leaks. Any good input would be greatly appreciated.
Last edited by Miwhy; Feb 6, 2024 at 11:24 AM.
Reason: Need to add more replacement parts
brand new stainless steel with the flex tubing.
have no boost gauge, but monitoring the map sensor 5 volt reference good and signal voltage is 1.01 volts at idle reving engine to 2500 rpms it only changes to 1.15 volts. Probably should get a pressure gauge.
Up pipes can be tricky to install. Aligning the collector to the baby's butt a common source of boost leaks. Get a pic of that if you can.
But the P1316 is screaming. A wiring fault normally, but sometimes a bad IDM. First check is inspecting the underside of the 42 pin harness where it can rub on the driver side valve cover.
What does your discrete boost gauge say you are getting for boost?
Installed a 0-100 psi sensor from Holley/Edge tuners. At idle is zero, running down the road flooring it 5-6 psi with stock tune. Get code P1247. Sorry for late response had to go out of town. I did tape the wiring up that goes to the idm connector on top of the valve cover and got rid of P1316. Also still getting the P1211.
That’s pretty low, which I think explains the P1247 code (accurate).
Sounds like you have boost or exhaust drive pressure leaks.
As aawlbernin said, the uppipes can be tricky. Confirm the baby’s butt connection.
Make a boost leak pressure tester and search for leaks at about 25psi… if you can get it there. Connect to the turbo inlet. Do not include the CCV section or you’ll send pressure to the crank case.
Any unusual exhaust related noises when the turbo spools up? I had a loose up-pipe flange that caused a very noticeable and annoying "whoosh-whoosh-whoosh" noise when I would get on it a little and the turbo started making pressure until I figured that one out.
You can test your IDM by doing a simple buzz test with ForScan, and not a bad idea to disconnect the 42 pin connector and make sure it isn't rubbing the underside of the wiring harness on the valve cover. If it is, simply bending the metal bracket the 42 pin harness clips onto upwards slightly will fix it assuming none of the wires are rubbed through and grounding out on the valve cover. (never mind, saw you caught that already)
Did the new turbo come with a new wastegate actuator?
The new turbo came with the waste gate and pedestal pre-assembled all brand new. Today I noticed on the left side of the turbo just below the exhaust v clamp there is a lever that doesn't look like it hooked up to anything. My stepson who did all the work for me said the rod to the lever may had come off. (he's a master mechanic) So in the morning I will check it out. Here's a picture of the suspect. Just below the clamp.and to the right may be the problem. Fingers crossed, will let people know tomorrow. The clamps look good on the up pipes.
So it appears that the low turbo pressure is fixed. I reconnected the exhaust back pressure valve linkage and now I'm getting 13 to 15 psi. I also replaced the engine harness and am getting PO380 dtc. Which is glow plug circuit A malfunction. Does anybody know what side that circuit is? Drivers or passenger side?
Never mind it was the new glow plug relay that was bad. Installed the old one and it works fine! Apparently the circuit A has to do with the relay coil not the left/right bank of glow plugs. Thanks for all the input on the low turbo pressure problem. Learning more everyday on these 7.3 diesels. Only problem left is the low/high oil pressure PO1211. It's probably the ipr or pressure sensor I got off ebay even though the plastic bags they came in looked like Ford oem parts.
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