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Old 10-16-2020, 09:05 AM   #1
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Over Boost C7 WAX 73060

My 2006 C7 is not limiting how much boost is being produced. I have to watch my boost gauge like a hawk or I get fault codes. My boost gauge will go as high as 30lbs. I’m sure when things were normal the max was about 26 lbs. What could be causing the over boost condition. When we left Florida last spring my stop engine and check engine light came on almost as soon as I entered the highway. I backed off the throttle and everything went back to normal. It continued doing this for probably the first two hours of the trip and we made it all the way back to Canada without anymore occurrences. We stayed parked all summer and this fall on our way to the west coast to stay this winter it started doing it again and is getting worse. Could it be an airline or something that is causing my problem? Hopefully it is something simple as it stated out being intermittent. Now it is not but now I know why I am getting the fault code and I can drive accordingly, but it is not operating correctly. Hopefully someone with more knowledge on this engine can help me.
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Old 10-16-2020, 12:09 PM   #2
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If you have a standard turbo (not a variable geometry turbo) check the wastegate mounted just below your turbo. Maybe the hose came off or has a hole in it. If the boost pressure cant reach the wastegate the turbo will continue to make boost.
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Old 10-16-2020, 06:33 PM   #3
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Pressure from the outlet side of the turbo charger , goes through the hose , red arrow ; to the waste gate actuator , green arrow ; that opens the wastegate , yellow arrow, ( inside the housing , not visible ) to slow the turbo and reduce intake pressure ( boost ).
I'll look for a picture that will show these parts a mounted on your engine.
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Old 10-17-2020, 10:53 AM   #4
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You're getting warning bells and whistles at 30 psi? Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, hits 27 psi on an infrequent basis, normally runs around 26. I'm by far, no expert but, I wouldn't think 3-4 psi would trigger any alarms but, what do I know.
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Old 10-17-2020, 11:15 AM   #5
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Quote:
Originally Posted by FIRE UP View Post
You're getting warning bells and whistles at 30 psi? Our coach, an '04 Itasca Horizon 36GD with the C-7 330HP CAT, hits 27 psi on an infrequent basis, normally runs around 26. I'm by far, no expert but, I wouldn't think 3-4 psi would trigger any alarms but, what do I know.

Scott


Mine was the same way but once it hits 30lbs it derates and the Stop Engine and Check Engine light goes on. Back off the throttle and away it goes again.
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Old 10-17-2020, 11:17 AM   #6
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Quote:
Originally Posted by Skip426 View Post
Pressure from the outlet side of the turbo charger , goes through the hose , red arrow ; to the waste gate actuator , green arrow ; that opens the wastegate , yellow arrow, ( inside the housing , not visible ) to slow the turbo and reduce intake pressure ( boost ).

I'll look for a picture that will show these parts a mounted on your engine.


Thanks for the info. Now I have a better idea of what to look for.
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Old 10-17-2020, 12:31 PM   #7
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Thanks for the info. Now I have a better idea of what to look for.
If you find that the hose is intact , disconnect it from the actuator , and apply air pressure at 30 psi . If you hear air leaking from the actuator and the push rod doesn't move , a new actuator is required ... then all you have to do is find one.

Note the picture I posted is a turbo the 3126 B series Cat , forerunner of the C-7. I'll take another look for a C-7 turbo .
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