Intermittent Boost Cut-out - Diesel Forum - TheDieselStop.com
Power Stroke Excursions Technical discussion of the Ford Excursion SUV with the Power Stroke diesel.

 
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post #1 of 4 (permalink) Old 01-28-2019, 10:21 PM Thread Starter
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Intermittent Boost Cut-out

I hate to be “that guy” whose first post is a problem, but...

2003 Excursion
6.0 Powerstroke
Edge Attitude
No other mods.

Symptoms: Intermittent boost cut-out. When it happens, it’s “cyclical”...as in, the cut out feels like someone gently tapping the brakes about every .5 second. Boost meter on the Edge shows boost drops 3-4 lbs with each “tap”. If I ease off the gas, the symptom subsides. It’s accompanied by an associated short “whoosh” or “puffing” sound from under the hood with each “tap”.

Conditions: Most often when encountering a hill when boost starts to increase. Usually associated with a downshift of the automatic trans. Seems to be more prevalent in warmer temps.

History: First onset was actually a few years ago, but shop couldn’t duplicate it or track down the problem. Originally, only happened maybe once a month, but could count on it happening on the same hill on the way home if I got it to downshift. Just lately, has become more frequent, to the point that it happens occasionally under normal traffic acceleration. Had parked it until I had some time to troubleshoot. Took it out yesterday and could not duplicate. Hard acceleration up to 22 lbs on the Edge with no problems.

Other: Edge shows a P132b code, which doesn’t necessarily tell me anything more specific than I’ve got a boost problem. (Please educate me if I’m wrong!). Checked all of the rubber “couplers” I could get to and didn’t find any obvious leaks. (Don’t think it would be a “leak” anyway, due to the intermittent nature of the symptoms, correct?)

Possibilities? Solenoid? Wastegate? Anything else? Stuck vane? (Don’t even know what that means, but I’ve seen it mentioned in other boost problem threads!)

I’m pretty well versed wrenching on my own stuff, but admittedly not smart on these big turbo diesels. Any and all direction this diesel brain trust could possibly provide would be greatly appreciated! Will do whatever I can to investigate any suggestions to the extent my tools and abilities allow!

Thanks much, in advance, for your help.
EJ
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post #2 of 4 (permalink) Old 01-31-2019, 03:05 PM
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Probably not much help but I have noticed that problem sometimes with my 7.3. Mine seems to be cold related as in if I run in to the store or something and let it run in sub zero temps, when I come back out I have zero boost and that wooshing sound. I am assuming that my waste gate is freezing open. this problem resolves itself within a mile and back to normal. I plan on starting with replacing the waste gate. Hope this helps you.
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post #3 of 4 (permalink) Old 01-31-2019, 03:33 PM
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Quote:
Originally Posted by bdevlin2414 View Post
Probably not much help but I have noticed that problem sometimes with my 7.3. Mine seems to be cold related as in if I run in to the store or something and let it run in sub zero temps, when I come back out I have zero boost and that wooshing sound. I am assuming that my waste gate is freezing open. this problem resolves itself within a mile and back to normal. I plan on starting with replacing the waste gate. Hope this helps you.
That is the Exhaust Back Pressure Valve system on the 7.3L working like it should. It'll do that until the oil temp come up to normal range. It's not the wastegate. Lots of people confuse the two. No need to replace anything.


The OP's problem may be turbo surge, or possibly an issue with the adjustable vanes on the turbo. I'm not real familiar with that system, so someone with a 6.0L will need to chime in.


Here's some info on the P123b code you're getting. https://www.thedieselstop.com/forums...e-code-114123/

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Last edited by klhansen; 01-31-2019 at 03:36 PM.
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post #4 of 4 (permalink) Old 02-01-2019, 01:49 PM
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I should clarify my issue. This problem is happening after I warm it up to operating temp and then drive. I leave it run because I am just running in to get milk, kids, something quick, when I return it is on high idle but still in operating temp but when I go to leave there is a serious lack of power and I can hear that wooshing. After a mile or so it goes away almost like the waste gate closed.
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