Puzzling loss of power, wastegate code
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Mountain Pass
Joined: Apr 2021
Posts: 134
Likes: 24
From: Laredo Texas
Puzzling loss of power, wastegate code
This is from my brother in law who lives way up in north Texas. I have not actually seen his truck in years. He's getting CEL then power loss since he loaded SuperChip tunes (he didn't ask me first) , He says he took off the SuperChip tune right away, but I don't know how. I convinced him to buy an Edge CTS3 so he can watch PIDs and read codes. His sees P1249 (overboost) all the time and P1211 (but ICP/IPW/IPR values he sees are OK). I suspect this is bad tunes with the PCM defueling in reaction to overboost, or fuel delivery related, but he's done the showerhead and removed that prefilter. I've never had a P1249 or SuperChips on any of our trucks. If you can help him out, we'd be grateful. His mechanic is just throwing parts at it now, it seems.
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Here is what I have been dealing with guys. Not sure how much info you would like, so I provided all I could think of.
-I started with a completely stock 02 f250 7.3. Never tuned. I've driven it about 170,000 miles and 15 years or so without ever seeing a check engine light and no problems to speak of.
-Put a SuperChip tune on it about 9 months ago for about a week. I was running too lean of a tune on it I guess because I was occasionally popping a check engine without a load.
-I hooked up my camper (weights about 9,000 lbs) to it with the tune and didn’t make the first hill (Texas hill country, so nothing too crazy) without popping the check engine. When the check engine pops, it seems to go into a limp mode of sorts. RPMs steadily tank and barely make it up the up the hill I'm climbing. Like heading up a half mile to mile climb going 40.
-I turned around that day. Stripped the tune and set it back to factory. It started making hills fine.
-Ever since then, each time I haul the camper, at least one time in the trip the check engine will pop up with the same performance issues. Always the same scenario: trucks been running a while (couple to few hours), making grades with no issues, then hit a decent grade, check engine pops up, performance tanks to the point I make the hill going 40.
-I've had multiple things replaced (which are listed below) but not all are related to this issue.
-In an attempt to help it out, I installed a KC300x stage 1 turbo with EBP delete, bellowed up pipes, 4" downpipes, 4" exhaust.
-I also installed Edge CTS3 gauges without a tune.
-Since I have access to that diagnostic info on the CTS3 now, what happens is that the Wastegate Control Valve Performance (P1249 code) is a constant code I have even without a load. Once I pop the check engine light (in THE scenario) , the ICP Above or Below Desired (P1211) shows up. EGTs are sub 1200, ICP is 2500-2800 psi or so, RPMs are 2700-2900 as I start the grade but drop to close to 2000, EOT / TFTs are both in line, boost doesn’t seem to get over about 18. Speed goes from 65 down to 35 or so.
Repairs:
238,700 - pedestal mount 06.23.2022
238,700 - thermostat housing 06.23.2022
238,700 - injector cups 06.23.2022
240,000 - cold air intake
240,000 - oil pump seals / gasket
- high press oil lines 08.15.2022
247,000 - MAP sensor 11.30.2022
248,000 - belt 12.02.2022
248,000 - water pump 12.07.2022
248,000 - edge gauges 12.07.2022
248,000 - high press oil pump 12.07.2022
248,000 - ICP sensor (OEM) 12.14.2022
248,000 - wastegate control valve replaced again
248,000 - KC300x turbo with EBP delete
- 4" downpipes, 4" exhaust
- bellowed up pipes
249,000 - wastegate control valve replaced again
--------------------------------------
Here is what I have been dealing with guys. Not sure how much info you would like, so I provided all I could think of.
-I started with a completely stock 02 f250 7.3. Never tuned. I've driven it about 170,000 miles and 15 years or so without ever seeing a check engine light and no problems to speak of.
-Put a SuperChip tune on it about 9 months ago for about a week. I was running too lean of a tune on it I guess because I was occasionally popping a check engine without a load.
-I hooked up my camper (weights about 9,000 lbs) to it with the tune and didn’t make the first hill (Texas hill country, so nothing too crazy) without popping the check engine. When the check engine pops, it seems to go into a limp mode of sorts. RPMs steadily tank and barely make it up the up the hill I'm climbing. Like heading up a half mile to mile climb going 40.
-I turned around that day. Stripped the tune and set it back to factory. It started making hills fine.
-Ever since then, each time I haul the camper, at least one time in the trip the check engine will pop up with the same performance issues. Always the same scenario: trucks been running a while (couple to few hours), making grades with no issues, then hit a decent grade, check engine pops up, performance tanks to the point I make the hill going 40.
-I've had multiple things replaced (which are listed below) but not all are related to this issue.
-In an attempt to help it out, I installed a KC300x stage 1 turbo with EBP delete, bellowed up pipes, 4" downpipes, 4" exhaust.
-I also installed Edge CTS3 gauges without a tune.
-Since I have access to that diagnostic info on the CTS3 now, what happens is that the Wastegate Control Valve Performance (P1249 code) is a constant code I have even without a load. Once I pop the check engine light (in THE scenario) , the ICP Above or Below Desired (P1211) shows up. EGTs are sub 1200, ICP is 2500-2800 psi or so, RPMs are 2700-2900 as I start the grade but drop to close to 2000, EOT / TFTs are both in line, boost doesn’t seem to get over about 18. Speed goes from 65 down to 35 or so.
Repairs:
238,700 - pedestal mount 06.23.2022
238,700 - thermostat housing 06.23.2022
238,700 - injector cups 06.23.2022
240,000 - cold air intake
240,000 - oil pump seals / gasket
- high press oil lines 08.15.2022
247,000 - MAP sensor 11.30.2022
248,000 - belt 12.02.2022
248,000 - water pump 12.07.2022
248,000 - edge gauges 12.07.2022
248,000 - high press oil pump 12.07.2022
248,000 - ICP sensor (OEM) 12.14.2022
248,000 - wastegate control valve replaced again
248,000 - KC300x turbo with EBP delete
- 4" downpipes, 4" exhaust
- bellowed up pipes
249,000 - wastegate control valve replaced again
Cargo Master
Joined: Apr 2022
Posts: 3,196
Likes: 1,698
I would throw a actual boost gauge on it and see how much it's actually making. Could actually be over boosting. Mine would do it all the time before I put boost fooler on it. I have the wastegate solenoid and lines completely removed from mine so none of that should cause it.
Thread Starter
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Mountain Pass
Joined: Apr 2021
Posts: 134
Likes: 24
From: Laredo Texas
I would throw a actual boost gauge on it and see how much it's actually making. Could actually be over boosting. Mine would do it all the time before I put boost fooler on it. I have the wastegate solenoid and lines completely removed from mine so none of that should cause it.
UPDATE: He's seeing 18 psi. I don't recall ever seeing more than 15 psi on untuned trucks, so this reinforces my thoughts that he is actually in overboost. I advised him to get a boost fooler and Hydra from Riffraff. Use the Hydra to crush whatever leftover tunes are on his PCM.
I found a thread on powerstroke dot com where the poster had the same issue, but his PCM was not defueling in reaction to the P1249 so he didn't lose power. Given that we have so many different PCM versions in our trucks, I wonder if some will defuel on overboost while others will not? I need to study that issue more, because we have two spare PCMs on the shelf, so we don't get stuck paying a lot for one if we need it. Prices on PCMs have gone nuts.
Laughing Gas
Joined: Jun 2017
Posts: 834
Likes: 125
From: CSRA, SC
Checked fuel pressure? Some trucks can throw a P1211 for low ICP if they have a junk tune on them so if that's only happening with the tune, thats the problem. If it's happening without the tune, thats a bad sign for HPOP performance or an issue with the IPR valve. Looks like the P1249 occurs if the PCM detects the turbo is overboosting. That could be a tune issue, maybe not I'm not real sure. The procedure to test for it revolves around checking the green/red lines to the WGC system for cracks. I've never heard of people complain about this personally. Don't really think that's the cause of the issue. I'd check fuel pressure at the bowl and see if you have a bad pump or fuel pressure relief valve. It kinda sounds like to me that the thing has no power and he's giving it a ton more pedal which is commanding the HPOP to work harder and trigger the P1211 because the pressure doesn't keep up with the command. But at the same time, if you had fuel issues, you definitely would not trigger an overboost code...
Cargo Master
Joined: Apr 2022
Posts: 3,196
Likes: 1,698
That reads from the map sensor. And goes through 2 computers by the time it comes up on the screen. Could be overboosting before it has time to update on the screen and start defueling before you knew it was even high.
Laughing Gas
Joined: Jun 2017
Posts: 834
Likes: 125
From: CSRA, SC
The comments about boost fooler are wayy more probable than what i mentioned. I haven't worried about that in so long that I completely forgot this was a thing.
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